# tvm.relay¶

The Relay IR namespace containing the IR definition and compiler.

Functions:

Classes:

 RefType alias of tvm.ir.type.RelayRefType Expr alias of tvm.ir.expr.RelayExpr Constant(data) A constant expression in Relay. Tuple(fields[, span]) Tuple expression that groups several fields together. Function(params, body[, ret_type, ...]) A function declaration expression. Call(op, args[, attrs, type_args, span]) Function call node in Relay. Let(variable, value, body) Let variable binding expression. If(cond, true_branch, false_branch) A conditional expression in Relay. TupleGetItem(tuple_value, index) Get index-th item from a tuple. RefCreate(value) Create a new reference from initial value. RefRead(ref) Get the value inside the reference. RefWrite(ref, value) Update the value inside the reference. Pattern Base type for pattern matching constructs. PatternWildcard() Wildcard pattern in Relay: Matches any ADT and binds nothing. PatternVar(var) Variable pattern in Relay: Matches anything and binds it to the variable. PatternConstructor(constructor[, patterns]) Constructor pattern in Relay: Matches an ADT of the given constructor, binds recursively. PatternTuple([patterns]) Constructor pattern in Relay: Matches a tuple, binds recursively. TypeData(header, type_vars, constructors) Stores the definition for an Algebraic Data Type (ADT) in Relay. Clause(lhs, rhs) Clause for pattern matching in Relay. Match(data, clauses[, complete]) Pattern matching expression in Relay. TypeFunctor() An abstract visitor defined over Type. TypeVisitor() A visitor over Type. TypeMutator() A functional visitor over Type. ExprFunctor() An abstract visitor defined over Expr. ExprVisitor() A visitor over Expr. ExprMutator() A functional visitor over Expr. Prelude([mod]) Contains standard definitions. TupleWrapper(tuple_value, size) TupleWrapper. ScopeBuilder() Scope builder class.
tvm.relay.setrecursionlimit(n)

Set the maximum depth of the Python interpreter stack to n. This limit prevents infinite recursion from causing an overflow of the C stack and crashing Python. The highest possible limit is platform- dependent.

tvm.relay.build(ir_mod, target=None, target_host=None, executor=graph{"link-params": (bool)0}, runtime=cpp, workspace_memory_pools=None, constant_memory_pools=None, params=None, mod_name='default')

Helper function that builds a Relay function to run on TVM graph executor.

Parameters
• ir_mod (IRModule) – The IR module to build. Using relay.Function is deprecated.

• target (None, or any multi-target like object, see Target.canon_multi_target) – For homogeneous compilation, the unique build target. For heterogeneous compilation, a dictionary or list of possible build targets. Defaults to the current target in the environment if None.

• target_host (None, or any target like object, see Target.canon_target) – Host compilation target, if target is device.

• executor (Optional[Executor]) – The executor configuration with which to build the model. Defaults to “graph” if no executor specified.

• runtime (Optional[Runtime]) – Runtime configuration to use when building the model. Defaults to “cpp” if no runtime specified.

• workspace_memory_pools (Optional[WorkspaceMemoryPools]) – The object that contains an Array of WorkspacePoolInfo objects that hold properties of read-write workspace pools that could be used by the inference.

• constant_memory_pools (Optional[ConstantMemoryPools]) – The object that contains an Array of ConstantPoolInfo objects that hold properties of read-only pools that could be used by the inference.

• params (dict of str to NDArray) – Input parameters to the graph that do not change during inference time. Used for constant folding.

• mod_name (Optional[str]) – The module name we will build

Returns

factory_module – The runtime factory for the TVM graph executor.

Return type

tvm.relay.backend.executor_factory.ExecutorFactoryModule

tvm.relay.create_executor(kind='debug', mod=None, device=None, target='llvm', params=None)

Factory function to create an executor.

Example

import tvm.relay
import numpy as np

x = tvm.relay.var("x", tvm.relay.TensorType([1], dtype="float32"))
expr = tvm.relay.add(x, tvm.relay.Constant(tvm.nd.array(np.array([1], dtype="float32"))))
tvm.relay.create_executor(
kind="vm", mod=tvm.IRModule.from_expr(tvm.relay.Function([x], expr))
).evaluate()(np.array([2], dtype="float32"))
# returns array([3.], dtype=float32)
Parameters
• kind (str) – The type of executor. Avaliable options are debug for the interpreter, graph for the graph executor, aot for the aot executor, and vm for the virtual machine.

• mod (IRModule) – The Relay module containing collection of functions

• device (Device) – The device to execute the code.

• target (any multi-target like object, see Target.canon_multi_target) – For homogeneous compilation, the unique build target. For heterogeneous compilation, a dictionary or list of possible build targets. CAUTION: Though this API allows multiple targets, it does not allow multiple devices, so heterogenous compilation is not yet supported.

• params (dict of str to NDArray) – Input parameters to the graph that do not change during inference time.

Returns

executor

Return type

Executor

tvm.relay.optimize(mod, target=None, params=None)

Helper function that optimizes a Relay module.

Parameters
• mod (IRModule) – The module to build. Using relay.Function is deprecated.

• target (None, or any multi-target like object, see Target.canon_multi_target) – For homogeneous compilation, the unique build target. For heterogeneous compilation, a dictionary or list of possible build targets. Defaults to the current target in the environment if None.

• params (dict of str to NDArray) – Input parameters to the graph that do not change during inference time. Used for constant folding.

Returns

• mod (IRModule) – The optimized relay module.

• params (dict) – The parameters of the final graph.

tvm.relay.build_config(opt_level=2, required_pass=None, disabled_pass=None, trace=None)

Configure the build behavior by setting config variables. This function will be deprecated in TVM v0.7. Instead, we should directly use tvm.transform.PassContext.

Parameters
• opt_level (int, optional) –

Optimization level. The optimization pass name and level are as the following:

OPT_PASS_LEVEL = {
"SimplifyInference": 0,
"OpFusion": 1,
"FoldConstant": 2,
"FoldScaleAxis": 3,
"AlterOpLayout": 3,
"CanonicalizeOps": 3,
"CanonicalizeCast": 3,
"EliminateCommonSubexpr": 3,
"CombineParallelConv2D": 4,
"CombineParallelDense": 4,
"CombineParallelBatchMatmul": 4,
"FastMath": 4
}

• required_pass (set of str, optional) – Optimization passes that are required regardless of optimization level.

• disabled_pass (set of str, optional) – Optimization passes to be disabled during optimization.

• trace (Callable[[IRModule, PassInfo, bool], None]) – A tracing function for debugging or introspection.

Returns

pass_context – The pass context for optimizations.

Return type

PassContext

tvm.relay.ShapeVar(name)

A helper which constructs a type var of which the shape kind.

Parameters

name (str) –

Returns

type_var – The shape variable.

Return type

tvm.relay.TypeVar

tvm.relay.scalar_type(dtype)

Creates a scalar type.

This function returns TensorType((), dtype)

Parameters

dtype (str) – The content data type.

Returns

s_type – The result type.

Return type

tvm.relay.TensorType

tvm.relay.RefType

alias of tvm.ir.type.RelayRefType

tvm.relay.Expr

alias of tvm.ir.expr.RelayExpr Attributes:

 checked_type Get the checked type of tvm.relay.Expr.
class tvm.relay.Constant(data)

A constant expression in Relay.

Parameters

data (tvm.nd.NDArray) – The data content of the constant expression.

class tvm.relay.Tuple(fields, span=None)

Tuple expression that groups several fields together.

Parameters
• fields (List[tvm.relay.Expr]) – The fields in the tuple.

• span (Optional[tvm.relay.Span]) – Span that points to original source code

Methods:

 astype(_) Cast the content type of the current data to dtype.
astype(_)

Cast the content type of the current data to dtype.

Parameters

dtype (str) – The target data type.

Note

This function only works for TensorType Exprs.

Returns

result – The result expression.

Return type

tvm.relay.Expr

class tvm.relay.Function(params, body, ret_type=None, type_params=None, attrs=None)

A function declaration expression.

Parameters
• params (List[tvm.relay.Var]) – List of input parameters to the function.

• body (tvm.relay.Expr) – The body of the function.

• ret_type (Optional[tvm.relay.Type]) – The return type annotation of the function.

• type_params (Optional[List[tvm.relay.TypeParam]]) – The additional type parameters, this is only used in advanced usecase of template functions.

class tvm.relay.Call(op, args, attrs=None, type_args=None, span=None)

Function call node in Relay.

Call node corresponds the operator application node in computational graph terminology.

Parameters
• op (tvm.ir.Op or any tvm.relay.Expr with function type.) – The operation to be called.

• args (List[tvm.relay.Expr]) – The arguments to the call.

• attrs (Optional[tvm.Attrs]) – Attributes to the call, can be None

• type_args (Optional[List[tvm.relay.Type]]) – The additional type arguments, this is only used in advanced usecase of template functions.

• span (Optional[tvm.relay.Span]) – Span that points to original source code

class tvm.relay.Let(variable, value, body)

Let variable binding expression.

Parameters
• variable (tvm.relay.Var) – The local variable to be bound.

• value (tvm.relay.Expr) – The value to be bound.

• body (tvm.relay.Expr) – The body of the let binding.

class tvm.relay.If(cond, true_branch, false_branch)

A conditional expression in Relay.

Parameters
• cond (tvm.relay.Expr) – The condition.

• true_branch (tvm.relay.Expr) – The expression evaluated when condition is true.

• false_branch (tvm.relay.Expr) – The expression evaluated when condition is false.

class tvm.relay.TupleGetItem(tuple_value, index)

Get index-th item from a tuple.

Parameters
• tuple_value (tvm.relay.Expr) – The input tuple expression.

• index (int) – The index.

class tvm.relay.RefCreate(value)

Create a new reference from initial value. :param value: The initial value. :type value: tvm.relay.Expr

Get the value inside the reference. :param ref: The reference. :type ref: tvm.relay.Expr

class tvm.relay.RefWrite(ref, value)

Update the value inside the reference. The whole expression will evaluate to an empty tuple. :param ref: The reference. :type ref: tvm.relay.Expr :param value: The new value. :type value: tvm.relay.Expr

class tvm.relay.Pattern

Base type for pattern matching constructs.

class tvm.relay.PatternWildcard

Wildcard pattern in Relay: Matches any ADT and binds nothing.

class tvm.relay.PatternVar(var)

Variable pattern in Relay: Matches anything and binds it to the variable.

class tvm.relay.PatternConstructor(constructor, patterns=None)

Constructor pattern in Relay: Matches an ADT of the given constructor, binds recursively.

class tvm.relay.PatternTuple(patterns=None)

Constructor pattern in Relay: Matches a tuple, binds recursively.

class tvm.relay.TypeData(header, type_vars, constructors)

Stores the definition for an Algebraic Data Type (ADT) in Relay.

Note that ADT definitions are treated as type-level functions because the type parameters need to be given for an instance of the ADT. Thus, any global type var that is an ADT header needs to be wrapped in a type call that passes in the type params.

Parameters
• header (GlobalTypeVar) – The name of the ADT. ADTs with the same constructors but different names are treated as different types.

• type_vars (List[TypeVar]) – Type variables that appear in constructors.

• constructors (List[Constructor]) – The constructors for the ADT.

Alias of tvm.ir.TypeData()

class tvm.relay.Clause(lhs, rhs)

Clause for pattern matching in Relay.

class tvm.relay.Match(data, clauses, complete=True)

Pattern matching expression in Relay.

tvm.relay.var(name_hint, type_annotation=None, shape=None, dtype='float32')

Create a new tvm.relay.Var.

This is a simple wrapper function that allows specify shape and dtype directly.

Parameters
• name_hint (str) – The name of the variable. This name only acts as a hint, and is not used for equality.

• type_annotation (Optional[tvm.relay.Type, str]) – The type annotation on the variable. When type_annotation is a str, we will create a scalar variable.

• shape (Optional[List[tvm.Expr]]) – The shape of the tensor type.

• dtype (str, optional) – The data type of the tensor.

Examples

# The following 4 lines are equivalent to each other
x = tvm.relay.Var("x", tvm.relay.TensorType([1, 2]))
x = tvm.relay.var("x", tvm.relay.TensorType([1, 2]))
x = tvm.relay.var("x", shape=[1, 2])
x = tvm.relay.var("x", shape=[1, 2], dtype="float32")

# The following 2 lines are equivalent to each other.
y = tvm.relay.var("x", "float32")
y = tvm.relay.var("x", shape=(), dtype="float32")
tvm.relay.const(value, dtype=None)

Create a constant value.

Parameters
• value (Union[bool, int, float, numpy.ndarray, tvm.nd.NDArray]) – The constant value.

• dtype (str, optional) – The data type of the resulting constant.

Note

When dtype is None, we use the following rule:

• int maps to “int32”

• float maps to “float32”

• bool maps to “bool”

• other using the same default rule as numpy.

tvm.relay.bind(expr, binds)

Bind an free variables in expr or function arguments.

We can bind parameters expr if it is a function.

Parameters
• expr (tvm.relay.Expr) – The input expression.

• binds (Map[tvm.relay.Var, tvm.relay.Expr]) – The specific bindings.

Returns

result – The expression or function after binding.

Return type

tvm.relay.Expr

class tvm.relay.TypeFunctor

An abstract visitor defined over Type.

Defines the default dispatch over types.

Methods:

 visit(typ) Apply the visitor to a type.
visit(typ)

Apply the visitor to a type.

class tvm.relay.TypeVisitor

A visitor over Type.

The default behavior recursively traverses the AST.

class tvm.relay.TypeMutator

A functional visitor over Type.

The default behavior recursively traverses the AST and reconstructs the AST.

class tvm.relay.ExprFunctor

An abstract visitor defined over Expr.

Defines the default dispatch over expressions, and implements memoization.

Methods:

 visit(expr) Apply the visitor to an expression.
visit(expr)

Apply the visitor to an expression.

class tvm.relay.ExprVisitor

A visitor over Expr.

The default behavior recursively traverses the AST.

class tvm.relay.ExprMutator

A functional visitor over Expr.

The default behavior recursively traverses the AST and reconstructs the AST.

class tvm.relay.Prelude(mod=None)

Contains standard definitions.

Methods:

 get_name(canonical, dtype) Get name corresponding to the canonical name get_global_var(canonical, dtype) Get global var corresponding to the canonical name get_type(canonical, dtype) Get type corresponding to the canonical name get_ctor(ty_name, canonical, dtype) Get constructor corresponding to the canonical name get_name_static(canonical, dtype, shape[, ...]) Get name corresponding to the canonical name get_global_var_static(canonical, dtype, shape) Get var corresponding to the canonical name get_type_static(canonical, dtype, shape) Get type corresponding to the canonical name get_ctor_static(ty_name, name, dtype, shape) Get constructor corresponding to the canonical name get_tensor_ctor_static(name, dtype, shape) Get constructor corresponding to the canonical name load_prelude() Parses the Prelude from Relay's text format into a module.
get_name(canonical, dtype)

Get name corresponding to the canonical name

get_global_var(canonical, dtype)

Get global var corresponding to the canonical name

get_type(canonical, dtype)

Get type corresponding to the canonical name

get_ctor(ty_name, canonical, dtype)

Get constructor corresponding to the canonical name

get_name_static(canonical, dtype, shape, batch_dim=None)

Get name corresponding to the canonical name

get_global_var_static(canonical, dtype, shape, batch_dim=None)

Get var corresponding to the canonical name

get_type_static(canonical, dtype, shape)

Get type corresponding to the canonical name

get_ctor_static(ty_name, name, dtype, shape)

Get constructor corresponding to the canonical name

get_tensor_ctor_static(name, dtype, shape)

Get constructor corresponding to the canonical name

Parses the Prelude from Relay’s text format into a module.

class tvm.relay.TupleWrapper(tuple_value, size)

TupleWrapper.

This class is a Python wrapper for a Relay tuple of known size. It allows for accessing the fields of the Relay tuple as though it were a Python tuple.

Parameters
• tuple_value (tvm.relay.Expr) – The input tuple

• size (int) – The size of the tuple.

Methods:

 astuple() Returns the underlying Relay tuple if this wrapper is passed as an argument to an FFI function. astext() Get the text format of the tuple expression.
astuple()

Returns the underlying Relay tuple if this wrapper is passed as an argument to an FFI function.

astext()

Get the text format of the tuple expression.

Returns

text – The text format of the tuple expression.

Return type

str

tvm.relay.abs(data)

Compute element-wise absolute of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.acos(data)

Compute elementwise acos of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.acosh(data)

Compute elementwise acosh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

Examples

x = relay.Var("a") # shape is [2, 3]
y = relay.Var("b") # shape is [2, 1]
z = relay.add(x, y)  # result shape is [2, 3]

Numpy style advanced indexing. Index with a list of tensors.

Parameters

inputs (Union(List[relay.Expr], Tuple[relay.Expr])) – Input tensor and indices. The first tensor is input data and rests are indices.

Returns

result – Output tensor.

Return type

relay.Expr

tvm.relay.all(data, axis=None, keepdims=False, exclude=False)

Computes the logical AND of boolean array elements over given axes.

Parameters
• data (relay.Expr) – The input boolean tensor

• axis (None or int or tuple of int) – Axis or axes along which a sum is performed. The default, axis=None, will sum all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

Examples

data = relay.Constant(tvm.nd.array([[[ True,  True,  True],
[ True,  True,  True],
[False,  True, False]],
[[ True, False, False],
[ True,  True, False],
[False,  True,  True]]]))

relay.all(data, axis=1)
# [[False,  True, False],
# [False, False, False]]

relay.all(data, axis=0)
# [[ True, False, False],
# [ True,  True, False],
# [False,  True, False]]
tvm.relay.any(data, axis=None, keepdims=False, exclude=False)

Computes the logical OR of boolean array elements over given axes.

Parameters
• data (relay.Expr) – The input boolean tensor

• axis (None or int or tuple of int) – Axis or axes along which a sum is performed. The default, axis=None, will sum all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

Examples

data = relay.Constant(tvm.nd.array([[[ True,  True,  True],
[ True,  True,  True],
[False,  True, False]],
[[ True, False, False],
[ True,  True, False],
[False,  True,  True]]]))

relay.any(data, axis=1)
# [[True, True, True],
# [True,  True, True]]

relay.any(data, axis=0)
# [[ True, True, True],
# [ True,  True, True],
# [False,  True, True]]
tvm.relay.arange(start, stop=None, step=None, dtype='float32')

Return evenly spaced values within a given interval.

Note

Similar to numpy.arange, when only one argument is given, it is used as stop instead of start while start takes default value 0.

Warning: Undefined behavior when dtype is incompatible with start/stop/step. It could lead to different results compared to numpy, MXNet, pytorch, etc.

Parameters
• start (tvm.Expr, optional) – Start of interval. The interval includes this value. The default start value is 0.

• stop (tvm.Expr) – Stop of interval. The interval does not include this value.

• step (tvm.Expr, optional) – Spacing between values. The default step size is 1.

• dtype (str, optional) – The target data type.

Returns

result – The resulting tensor.

Return type

relay.Expr

Examples

relay.arange(5) = [0, 1, 2, 3, 4]
relay.arange(1, 5) = [1, 2, 3, 4]
relay.arange(1, 5, 1.5) = [1, 2.5, 4]
tvm.relay.argmax(data, axis=None, keepdims=False, exclude=False, select_last_index=False)

Returns the indices of the maximum values along an axis.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a argmax operation is performed. The default, axis=None, will find the indices of the maximum element of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

• select_last_index (bool) – Whether to select the last index or the first index if the max element appears in multiple indices, default is False (first index).

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.argmin(data, axis=None, keepdims=False, exclude=False, select_last_index=False)

Returns the indices of the minimum values along an axis.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a argmin operation is performed. The default, axis=None, will find the indices of minimum element all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

• select_last_index (bool) – Whether to select the last index or the first index if the min element appears in multiple indices, default is False (first index).

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.argsort(data, axis=- 1, is_ascend=1, dtype='int32')

Performs sorting along the given axis and returns an array of indices having same shape as an input array that index data in sorted order.

Parameters
• data (relay.Expr) – The input data tensor.

• valid_count (tvm.te.Tensor) – The number of valid elements to be sorted.

• axis (int, optional) – Axis long which to sort the input tensor.

• is_ascend (boolean, optional) – Whether to sort in ascending or descending order.

• dtype (string, optional) – The data type of the output indices.

Returns

out – Tensor with same shape as data.

Return type

relay.Expr

tvm.relay.argwhere(condition)

Find the indices of elements of a tensor that are non-zero.

Parameters

condition (relay.Expr) – The input condition tensor.

Returns

out – Tensor with the indices of elements that are non-zero.

Return type

relay.Expr

Examples

condition = [[True, False], [False, True]]
relay.argwhere(condition) = [[0, 0], [1, 1]]
tvm.relay.asin(data)

Compute elementwise asin of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.asinh(data)

Compute elementwise asinh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.atan(data)

Compute elementwise atan of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.atanh(data)

Compute elementwise atanh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.bitwise_and(lhs, rhs)

bitwise AND with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.bitwise_not(data)

Compute element-wise bitwise not of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.bitwise_or(lhs, rhs)

bitwise OR with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.bitwise_xor(lhs, rhs)

bitwise XOR with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

Return a scalar value array with the same type, broadcast to the provided shape.

Parameters
• data (relay.Expr) – The input tensor.

• shape (tuple of int or relay.Expr) – Provide the shape to broadcast to.

Returns

result – The resulting tensor.

Return type

relay.Expr

Return a scalar value array with the same shape and type as the input array.

Parameters
• data (relay.Expr) – The input tensor.

• broadcast_type (relay.Expr) – Provide the type to broadcast to.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.cast(data, dtype)

Cast input tensor to data type.

Parameters
• data (relay.Expr) – The input data to the operator.

• dtype (str) – The target data type

Returns

result – The casted result.

Return type

relay.Expr

tvm.relay.cast_like(data, dtype_like)

Cast input tensor to data type of another tensor.

Parameters
• data (relay.Expr) – The input data to the operator.

• dtype_like (relay.Expr) – The tensor to cast to.

Returns

result – The casted result.

Return type

relay.Expr

tvm.relay.ceil(data)

Compute element-wise ceil of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.clip(a, a_min, a_max)

Clip the elements in a between a_min and a_max. a_min and a_max are cast to a’s dtype.

Parameters
• a (relay.Expr) – The input tensor.

• a_min (float) – The clip minimum.

• a_max (float) – The clip maximum.

Returns

resulta with elements clipped between a_min and a_max.

Return type

relay.Expr

Examples

x = relay.Constant(tvm.nd.array([0, 1, 5, 3, 4, 2]))
relay.clip(x, 1., 4.)
# [1, 1, 4, 3, 4, 2]
tvm.relay.collapse_sum_like(data, collapse_type)

Return a scalar value array with the same shape and type as the input array.

Parameters
• data (relay.Expr) – The input tensor.

• collapse_type (relay.Expr) – Provide the type to collapse to.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.collapse_sum_to(data, shape)

Return a summation of data to the specified shape.

Parameters
• data (relay.Expr) – The input tensor.

• shape (relay.Expr) – Shape to collapse to.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.concatenate(data, axis)

Concatenate the input tensors along the given axis.

Parameters
• data (Union(List[relay.Expr], Tuple[relay.Expr])) – A list of tensors.

• axis (int) – The axis along which the tensors are concatenated.

Returns

result – The concatenated tensor.

Return type

relay.Expr

tvm.relay.copy(data)

Copy a tensor.

Parameters

data (relay.Expr) – The tensor to be copied.

Returns

result – The copied result.

Return type

relay.Expr

tvm.relay.copy_shape_func(attrs, inputs, _)

Shape function for copy op.

tvm.relay.cos(data)

Compute elementwise cos of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.cosh(data)

Compute elementwise cosh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.cumprod(data, axis=None, dtype=None, exclusive=None)

Numpy style cumprod op. Return the cumulative inclusive product of the elements along a given axis.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (int, optional) – Axis along which the cumulative product is computed. The default (None) is to compute the cumprod over the flattened array.

• dtype (string, optional) – Type of the returned array and of the accumulator in which the elements are multiplied. If dtype is not specified, it defaults to the dtype of data.

• exclusive (bool, optional) – If true will return exclusive product in which the first element is not included. In other terms, if true, the j-th output element would be the product of the first (j-1) elements. Otherwise, it would be the product of the first j elements. The product of zero elements will be 1.

Returns

result – The result has the same size as data, and the same shape as data if axis is not None. If axis is None, the result is a 1-d array.

Return type

relay.Expr

Examples

a = [[1,2,3], [4,5,6]]

cumprod(a)  # if axis is not provided, cumprod is done over the flattened input.
-> [ 1,  2,  6, 24, 120, 720]

cumprod(a, dtype="float32")
-> [  1.,  2.,  6., 24., 120., 720.]

cumprod(a, axis=0)  # multiply over rows for each of the 3 columns
-> [[1, 2, 3],
[4, 10, 18]]

cumprod(a, axis=1)
-> [[ 1,  2,  6],
[ 4,  20, 120]]

a = [1, 1, 1, 0, 1, 1, 0]  # a is a boolean array
cumprod(a, dtype=int32)  # dtype should be provided to get the expected results
-> [1, 1, 1, 0, 0, 0, 0]
tvm.relay.cumsum(data, axis=None, dtype=None, exclusive=None)

Numpy style cumsum op. Return the cumulative inclusive sum of the elements along a given axis.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (int, optional) – Axis along which the cumulative sum is computed. The default (None) is to compute the cumsum over the flattened array.

• dtype (string, optional) – Type of the returned array and of the accumulator in which the elements are summed. If dtype is not specified, it defaults to the dtype of data.

• exclusive (bool, optional) – If true will return exclusive sum in which the first element is not included. In other terms, if true, the j-th output element would be the sum of the first (j-1) elements. Otherwise, it would be the sum of the first j elements.

Returns

result – The result has the same size as data, and the same shape as data if axis is not None. If axis is None, the result is a 1-d array.

Return type

relay.Expr

Examples

a = [[1,2,3], [4,5,6]]

cumsum(a)  # if axis is not provided, cumsum is done over the flattened input.
-> [ 1,  3,  6, 10, 15, 21]

cumsum(a, dtype="float32")
-> [  1.,   3.,   6.,  10.,  15.,  21.]

cumsum(a, axis=0)  # sum over rows for each of the 3 columns
-> [[1, 2, 3],
[5, 7, 9]]

cumsum(a, axis=1)
-> [[ 1,  3,  6],
[ 4,  9, 15]]

a = [1, 0, 1, 0, 1, 1, 0]  # a is a boolean array
cumsum(a, dtype=int32)  # dtype should be provided to get the expected results
-> [1, 1, 2, 2, 3, 4, 4]
tvm.relay.device_copy(data, src_device, dst_device)

Copy data from the source device to the destination device. This operator helps data transferring between difference devices for heterogeneous execution.

Parameters
• data (tvm.relay.Expr) – The tensor to be copied.

• src_device (Union[Device, str]) – The source device where the data is copied from.

• dst_device (Union[Device, str]) – The destination device where the data is copied to.

Returns

result – The copied result.

Return type

tvm.relay.Expr

tvm.relay.divide(lhs, rhs)

Division with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.einsum(data, equation)

Evaluates the Einstein summation convention on data

Parameters
• data (Union(List[relay.Expr], Tuple[relay.Expr])) – A list of tensors.

• equation (str) – The einsum expression string.

Returns

result – The output tensor from the einsum op.

Return type

relay.Expr

tvm.relay.equal(lhs, rhs)

Broadcasted elementwise test for (lhs == rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.erf(data)

Compute elementwise error function of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.exp(data)

Compute elementwise exp of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.expand_dims(data, axis, num_newaxis=1)

Insert num_newaxis axes at the position given by axis.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (Union[int, Expr]) – The axis at which the input array is expanded. Should lie in range [-data.ndim - 1, data.ndim]. If axis < 0, it is the first axis inserted; If axis >= 0, it is the last axis inserted in Python’s negative indexing.

• num_newaxis (int) – Number of axes to be inserted. Should be >= 0.

Returns

result – The reshaped result.

Return type

relay.Expr

tvm.relay.fixed_point_multiply(data, multiplier, shift)

Fixed point multiplication between data and a fixed point constant expressed as multiplier * 2^(-shift), where multiplier is a Q-number with 31 fractional bits

Parameters
• data (relay.Expr) – The input tensor.

• multiplier (int) – The integer multiplier of the fixed point constant.

• shift (int) – The integer shift of the fixed point constant.

Returns

result – The output of the fixed point multiplication

Return type

relay.Expr

tvm.relay.floor(data)

Compute element-wise floor of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.floor_divide(lhs, rhs)

Floor division with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.floor_mod(lhs, rhs)

Floor mod with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.full(fill_value, shape=(), dtype='')

Fill array with scalar value.

Parameters
• fill_value (relay.Expr) – The value to fill. Must be a scalar.

• shape (tuple of int or relay.Expr) – The shape of the target.

• dtype (data type, optional (defaults to data type of the fill value)) – The data type of the target.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.full_like(data, fill_value)

Return a scalar value array with the same shape and type as the input array.

Parameters
• data (relay.Expr) – The input tensor.

• fill_value (relay.Expr) – The scalar value to fill.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.gather(data, axis, indices)

Gather values along given axis from given indices.

E.g. for a 3D tensor, output is computed as:

out[i][j][k] = data[indices[i][j][k]][j][k]  # if axis == 0
out[i][j][k] = data[i][indices[i][j][k]][k]  # if axis == 1
out[i][j][k] = data[i][j][indices[i][j][k]]  # if axis == 2

indices must have same shape as data, except at dimension axis which must just be not null. Output will have same shape as indices.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (int) – The axis along which to index. negative axis is supported.

• indices (relay.Expr) – The indices of values to gather.

Examples

data = [[1, 2], [3, 4]]
axis = 1
indices = [[0, 0], [1, 0]]
relay.gather(data, axis, indices) = [[1, 1], [4, 3]]
tvm.relay.gather_nd(data, indices, batch_dims=0, index_rank=None)

Gather elements or slices from data and store to a tensor whose shape is defined by indices.

Parameters
• data (relay.Expr) – The input data to the operator.

• indices (relay.Expr) – The shape of output tensor.

• batch_dims (int) – The number of batch dimensions.

• index_rank (int, optional) – The size of an indexing tuple, which is a fixed value and the same as indices.shape[0] Only needed when other dimensions of indices are dynamic.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

data = [[0, 1], [2, 3]]
indices = [[1, 1, 0], [0, 1, 0]]
relay.gather_nd(data, indices) = [2, 3, 0]

data = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
indices = [[0, 1], [1, 0]]
relay.gather_nd(data, indices) = [[3, 4], [5, 6]]

data    = [[[0,1],[2,3]],[[4,5],[6,7]]]
indices = [[1, 0]]
relay.gather_nd(data, indices, batch_dims=1) = [[2,3],[4,5]]
tvm.relay.greater(lhs, rhs)

Broadcasted elementwise test for (lhs > rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.greater_equal(lhs, rhs)

Broadcasted elementwise test for (lhs >= rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.invert_permutation(data)

Computes the inverse permutation of data. This operation computes the inverse of an index permutation. It takes a 1-D integer tensor x, which represents the indices of a zero-based array and swaps each value with its index position.

For an output tensor y and an input tensor x, this operation computes the following: y[x[i]] = i for i in [0, 1, …, len(x) - 1]

Parameters

data (relay.Expr) – The source data to be invert permuated.

Returns

ret – Invert permuated data. Has the same type as data.

Return type

relay.Expr

Examples

data = [3, 4, 0, 2, 1]
relay.invert_permutation(data) = [2, 4, 3, 0, 1]
tvm.relay.isfinite(data)

Compute element-wise finiteness of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.isinf(data)

Compute element-wise infiniteness of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.isnan(data)

Check nan in input data element-wise.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.layout_transform(data, src_layout, dst_layout)

Transform the layout of a tensor

Parameters
• data (relay.Expr) – The source tensor to be transformed

• src_layout (str) – The source layout. (e.g NCHW)

• dst_layout (str) – The destination layout. (e.g. NCHW16c)

Returns

ret – The transformed tensor.

Return type

relay.Expr

tvm.relay.left_shift(lhs, rhs)

Left shift with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.less(lhs, rhs)

Broadcasted elementwise test for (lhs < rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.less_equal(lhs, rhs)

Broadcasted elementwise test for (lhs <= rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.log(data)

Compute elementwise log of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.log10(data)

Compute elementwise log to the base 10 of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.log2(data)

Compute elementwise log to the base 2 of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.logical_and(lhs, rhs)

logical AND with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.logical_not(data)

Compute element-wise logical not of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.logical_or(lhs, rhs)

logical OR with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.logical_xor(lhs, rhs)

logical XOR with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.logsumexp(data, axis=None, keepdims=False)

Compute the log of the sum of exponentials of input elements over given axes.

This function is more numerically stable than log(sum(exp(input))). It avoids overflows caused by taking the exp of large inputs and underflows caused by taking the log of small inputs.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a standard deviation operation is performed. The default, axis=None, will compute the log of the sum of exponentials of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.matrix_set_diag(data, diagonal, k=0, align='RIGHT_LEFT')

Returns a tensor with the diagonals of input tensor replaced with the provided diagonal values.

Parameters
• data (relay.Expr) – Input Tensor.

• diagonal (relay.Expr) – Values to be filled in the diagonal.

• k (int or tuple of int, optional) – Diagonal Offset(s). The diagonal or range of diagonals to set. (0 by default) Positive value means superdiagonal, 0 refers to the main diagonal, and negative value means subdiagonals. k can be a single integer (for a single diagonal) or a pair of integers specifying the low and high ends of a matrix band. k[0] must not be larger than k[1].

• align (string, optional) – Some diagonals are shorter than max_diag_len and need to be padded. align is a string specifying how superdiagonals and subdiagonals should be aligned, respectively. There are four possible alignments: “RIGHT_LEFT” (default), “LEFT_RIGHT”, “LEFT_LEFT”, and “RIGHT_RIGHT”. “RIGHT_LEFT” aligns superdiagonals to the right (left-pads the row) and subdiagonals to the left (right-pads the row). It is the packing format LAPACK uses. cuSPARSE uses “LEFT_RIGHT”, which is the opposite alignment.

Returns

result – New tensor with given diagonal values.

Return type

relay.Expr

Examples

data = [[[7, 7, 7, 7],
[7, 7, 7, 7],
[7, 7, 7, 7]],
[[7, 7, 7, 7],
[7, 7, 7, 7],
[7, 7, 7, 7]]]

diagonal = [[1, 2, 3],
[4, 5, 6]]

relay.matrix_set_diag(input, diagonal) =
[[[1, 7, 7, 7],
[7, 2, 7, 7],
[7, 7, 3, 7]],
[[4, 7, 7, 7],
[7, 5, 7, 7],
[7, 7, 6, 7]]]
tvm.relay.max(data, axis=None, keepdims=False, exclude=False)

Computes the max of array elements over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which the max operation is performed. The default, axis=None, will find the max element from all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.maximum(lhs, rhs)

Maximum with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.mean(data, axis=None, keepdims=False, exclude=False)

Computes the mean of array elements over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a mean operation is performed. The default, axis=None, will compute the mean of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.mean_std(data, axis=None, keepdims=False, exclude=False)

Computes the mean and standard deviation of data over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a mean and standard deviation operation is performed. The default, axis=None, will compute the mean and standard deviation of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.mean_variance(data, axis=None, keepdims=False, exclude=False, unbiased=False)

Computes the mean and variance of data over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a mean and variance operation is performed. The default, axis=None, will compute the mean and variance of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

• unbiased (bool) – If this is set to True, the unbiased estimation will be used.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.meshgrid(data, indexing='ij')

Create coordinate matrices from coordinate vectors.

Note

Similar to numpy.meshgrid.

Parameters
• data (Union(List[relay.Expr], Tuple[relay.Expr])) – A list of tensors, which must be either scalars or 1-D vectors.

• indexing (str) – Indexing mode, either “ij” for matrix indexing or “xy” for Cartesian indexing.

Returns

ret – The computed result.

Return type

relay.Tuple([relay.Expr, relay.Expr])

Examples

x = [1, 2, 3]
y = [4, 5]

gx, gy = relay.meshgrid([x, y])

gx = [[1., 1.],
[2., 2.],
[3., 3.]]

gy = [[4., 5.],
[4., 5.],
[4., 5.]]
tvm.relay.min(data, axis=None, keepdims=False, exclude=False)

Computes the min of array elements over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a minimum operation is performed. The default, axis=None, will find the minimum element from all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.minimum(lhs, rhs)

Minimum with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.mod(lhs, rhs)

Mod with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.multiply(lhs, rhs)

Multiplication with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.ndarray_size(data, dtype='int32')

Get number of elements of input tensor.

Parameters
• data (tvm.relay.Expr) – The input tensor.

• dtype (str, optional) – The target data type.

Returns

result – The number of elements of input tensor.

Return type

tvm.relay.Expr

tvm.relay.negative(data)

Compute element-wise negative of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.not_equal(lhs, rhs)

Broadcasted elementwise test for (lhs != rhs).

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.one_hot(indices, on_value, off_value, depth, axis, dtype)

Returns a one-hot tensor where the locations repsented by indices take value on_value, other locations take value off_value. Final dimension is <indices outer dimensions> x depth x <indices inner dimensions>.

Parameters
• indices (relay.Expr) – Locations to set to on_value.

• on_value (relay.Expr) – Value to fill at indices.

• off_value (relay.Expr) – Value to fill at all other positions besides indices.

• depth (int or relay.Expr) – Depth of the one-hot dimension.

• axis (int) – Axis to fill.

• dtype (str) – Data type of the output tensor.

Returns

ret – The one-hot tensor.

Return type

relay.Expr

Examples

indices = [0, 1, 2]

relay.one_hot(indices, 3) =
[[1, 0, 0],
[0, 1, 0],
[0, 0, 1]]
tvm.relay.ones(shape, dtype)

Fill array with ones.

Parameters
• shape (tuple of int or relay.Expr) – The shape of the target.

• dtype (data type) – The data type of the target.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.ones_like(data)

Returns an array of ones, with same type and shape as the input.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.power(lhs, rhs)

Power with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.prod(data, axis=None, keepdims=False, exclude=False)

Computes the products of array elements over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a product is performed. The default, axis=None, will find the indices of minimum element all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.reinterpret(data, dtype)

Reinterpret input tensor to data type.

Parameters
• data (relay.Expr) – The input data to the operator.

• dtype (str) – The target data type

Returns

result – The reinterpreted result.

Return type

relay.Expr

tvm.relay.repeat(data, repeats, axis)

Repeats elements of an array. By default, repeat flattens the input array into 1-D and then repeats the elements.

repeatsint

The number of repetitions for each element.

axis: int

The axis along which to repeat values. The negative numbers are interpreted counting from the backward. By default, use the flattened input array, and return a flat output array.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

x = [[1, 2], [3, 4]]
relay.repeat(x, repeats=2) = [1., 1., 2., 2., 3., 3., 4., 4.]

relay.repeat(x, repeats=2, axis=1) = [[1., 1., 2., 2.],
[3., 3., 4., 4.]]
tvm.relay.reshape(data, newshape, allowzero=False)

Reshape the input array.

To give user more convenience in without doing manual shape inference, some dimensions of the shape can take special values from the set {0, -1, -2, -3, -4}. The significance of each is explained below:

0 copy this dimension from the input to the output shape.

data.shape = (2,3,4), newshape = (4,0,2), result.shape = (4,3,2)
data.shape = (2,3,4), newshape = (2,0,0), result.shape = (2,3,4)

Note: If the parameter allowzero is manually set to true, it specifies a special case where 0 actually means a true empty tensor.

-1 infers the dimension of the output shape by using the remainder of the input dimensions keeping the size of the new array same as that of the input array. At most one dimension of shape can be -1.

data.shape = (2,3,4), newshape = (6,1,-1), result.shape = (6,1,4)
data.shape = (2,3,4), newshape = (3,-1,8), result.shape = (3,1,8)
data.shape = (2,3,4), newshape = (-1,), result.shape = (24,)

-2 copy all/remainder of the input dimensions to the output shape.

data.shape = (2,3,4), newshape = (-2,), result.shape = (2,3,4)
data.shape = (2,3,4), newshape = (2,-2), result.shape = (2,3,4)
data.shape = (2,3,4), newshape = (-2,1,1), result.shape = (2,3,4,1,1)

-3 use the product of two consecutive dimensions of the input shape as the output dimension.

data.shape = (2,3,4), newshape = (-3,4), result.shape = (6,4)
data.shape = (2,3,4,5), newshape = (-3,-3), result.shape = (6,20)
data.shape = (2,3,4), newshape = (0,-3), result.shape = (2,12)
data.shape = (2,3,4), newshape = (-3,-2), result.shape = (6,4)

-4 split one dimension of the input into two dimensions passed subsequent to -4 in shape (can contain -1).

data.shape = (2,3,4), newshape = (-4,1,2,-2), result.shape = (1,2,3,4)
data.shape = (2,3,4), newshape = (2,-4,-1,3,-2), result.shape = (2,1,3,4)
Parameters
• data (relay.Expr) – The input data to the operator.

• newshape (Union[int, Tuple[int], List[int]] or relay.Expr) – The new shape. Should be compatible with the original shape.

• allowzero (Bool, optional) – If true, then treat zero as true empty tensor rather than a copy instruction.

Returns

result – The reshaped result.

Return type

relay.Expr

tvm.relay.reshape_like(data, shape_like, lhs_begin=0, lhs_end=None, rhs_begin=0, rhs_end=None)

Reshapes the input tensor by the size of another tensor. For an input tensor with shape (d0, d1, ..., d(k-1)), reshape_like operation reshapes the input tensor into an output tensor with the same shape as the second input tensor, in particular reshaping the dimensions of data in [lhs_begin, lhs_end) using the dimensions from shape_like in [rhs_begin, rhs_end).

Note

Sizes for data and the output tensor should be compatible.

Parameters
• data (relay.Expr) – The input data to the operator.

• shape_like (relay.Expr) – The tensor to reshape data like. Should be compatible with the original shape on the reshaped dimensions.

• lhs_begin (int, optional) – The axis of data to begin reshaping. Default is 0.

• lhs_end (int or None, optional) – The axis of data where reshaping should stop, exclusive. Default is None which reshapes to the end.

• rhs_begin (int, optional) – The axis of shape_like where the target shape begins. Default is 0.

• rhs_end (int or None, optional) – The axis of shape_like where the target shape ends, exclusive. Default is None which extends to the end.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

data.shape == (1, 2, 3, 4)
shape_like.shape == (6, 2, 2, 3)

ret = relay.reshape_like(data, shape_like, lhs_begin=1, rhs_end=3)
ret.shape == (1, 6, 2, 2)
tvm.relay.reverse(data, axis)

Reverses the order of elements along given axis while preserving array shape.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (int) – The axis along which to reverse elements.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

x = [[1., 2.], [3., 4.]]
relay.reverse(x, axis=0) = [[3., 4.], [1., 2.]]

relay.reverse(x, axis=1) = [[2., 1.], [4., 3.]]
tvm.relay.reverse_reshape(data, newshape)

Reshapes the input array where the special values are inferred from right to left.

The special values have the same semantics as tvm.relay.reshape. The difference is that special values are inferred from right to left. It can be explained in the example below.

data.shape = (10,5,4), newshape = (-1,0), reshape results in (40,5)
data.shape = (10,5,4), newshape = (-1,0), reverse_reshape results in (40,5)
Parameters
• data (relay.Expr) – The input data to the operator.

• newshape (Union[int, Tuple[int], List[int]]) – The new shape. Should be compatible with the original shape.

Returns

result – The reshaped result.

Return type

relay.Expr

tvm.relay.reverse_sequence(data, seq_lengths, seq_axis=1, batch_axis=0)

Reverse the tensor for variable length slices. Input is first sliced along batch axis and then elements are reversed along seq axis.

Parameters
• data (relay.Expr) – The tensor to be reversed.

• seq_lengths (relay.Expr) – A 1D Tensor with length a.dims[batch_axis] Must be one of the following types: int32, int64 if seq_lengths[i] > a.dims[seq_axis], it is rounded to a.dims[seq_axis] if seq_lengths[i] < 1, it is rounded to 1

• seq_axis (int, optional) – The axis along which the elements will be reversed. Default is 1.

• batch_axis (int, optional) – The axis along which the tensor will be sliced. Default is 0.

Returns

ret – The computed result of same shape and type as of input.

Return type

relay.Expr

Examples

x = [[0, 1, 2, 3],
[4, 5, 6, 7],
[8, 9, 10, 11],
[12, 13, 14, 15]]
relay.reverse(x, [1, 2, 3, 4], 0, 1) = [[0, 5, 10, 15],
[4, 1, 6, 11],
[8, 9, 2, 7],
[12, 13, 14, 3]]

relay.reverse(x, [1, 2, 3, 4], 1, 0) = [[0, 1, 2, 3],
[5, 4, 6, 7],
[10, 9, 8, 11],
[15, 14, 13, 12]]
tvm.relay.right_shift(lhs, rhs)

Right shift with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.round(data)

Compute element-wise round of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.rsqrt(data)

Compute elementwise rsqrt of data.

$1/sqrt(x)$
Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.scatter(data, indices, updates, axis)

Update data at positions defined by indices with values in updates

Parameters
• data (relay.Expr) – The input data to the operator.

• indices (relay.Expr) – The index locations to update.

• updates (relay.Expr) – The values to update.

• axis (int) – The axis to scatter on

Returns

ret – The computed result.

Return type

relay.Expr

Update data by adding values in updates at positions defined by indices

Parameters
• data (relay.Expr) – The input data to the operator.

• indices (relay.Expr) – The index locations to update.

• updates (relay.Expr) – The values to add.

• axis (int) – The axis to scatter_add on

Returns

ret – The computed result.

Return type

relay.Expr

tvm.relay.scatter_nd(data, indices, updates, mode='update')

Scatter values from an array and update.

See tvm.topi.scatter() for how data is scattered.

Parameters
• data (relay.Expr) – The input data to the operator.

• indices (relay.Expr) – The index locations to update.

• updates (relay.Expr) – The values to update.

• mode (string) – The accumulation mode for scatter. “update” or “add”

Returns

ret – The computed result.

Return type

relay.Expr

tvm.relay.script(pyfunc)

Decorate a python function function as hybrid script.

The hybrid function support emulation mode and parsing to the internal language IR.

Returns

hybrid_func – A decorated hybrid script function.

Return type

function

tvm.relay.searchsorted(sorted_sequence, values, right=False, dtype='int32')
Find indices where elements should be inserted to maintain order.

If sorted_sequence is N-dimensional, the innermost dimension of values are searched in the corresponding dimension of sorted_sequence.

Parameters
• sorted_sequence (relay.Expr) – N-D or 1-D Tensor, containing monotonically increasing sequence on the innermost dimension.

• values (relay.Expr) – N-D Tensor containing the search values. When sorted_sequence is 1-D, the shape of values can be arbitrary. Otherwise, ranks of sorted_sequence and values must be the same, and outer N-1 axes must have the same size.

• right (bool, optional) – Controls which index is returned if a value lands exactly on one of sorted values. If False, the index of the first suitable location found is given. If true, return the last such index. If there is no suitable index, return either 0 or N (where N is the size of the innermost dimension).

• dtype (string, optional) – The data type of the output indices.

Returns

indices – Tensor with same shape as values, representing the indices of elements of values if they are inserted in sorted_sequence.

Return type

relay.Expr

tvm.relay.segment_sum(data, segment_ids, num_segments=None)

Computes the sum along segment_ids along axis 0. If multiple segment_ids reference the same location their contributions add up. result[index, j, k, …] = Σi… data[i, j, k,..] where index = segment_ids[i] This op is much better understood with visualization articulated in the following links and examples at the end of this docstring.

Parameters
• data (relay.Expr) – Input Tensor. It can be of any type and multi-dimensional

• segment_ids (relay.Expr) – A 1-D int32/int64 tensor containing the segment_ids of the rows to calculate the output sum upon. It defines a mapping from the zeroth dimension of data onto segment_ids. The segment_ids tensor should be the size of the first dimension, d0, with consecutive IDs in the range 0 to k, where k<d0. In particular, a segmentation of a matrix tensor is a mapping of rows to segments. This tensor doesn’t need to be sorted

• num_segments (Optional[int]) – An integer describing the shape of the zeroth dimension. If unspecified, its calculated equivalent to the number of unique segment_ids

Returns

result – Output tensor.

Return type

relay.Expr

Examples

data = [[1, 2, 3, 4],
[4, -3, 2, -1],
[5, 6, 7, 8]]
segment_ids = [0, 0, 1]
result = segment_sum(data, segment_ids)
result = [[5, -1, 5, 3],[5, 6, 7, 8]]

data = [[1, 2, 3, 4],
[4, -3, 2, -1],
[5, 6, 7, 8]]
segment_ids = [2, 0, 0]
num_segments = 3
result = segment_sum(data, segment_ids, num_segments)
result = [[5, 6, 7, 8],[0, 0, 0, 0], [5, -1, 5, 3]]

Sets all elements outside the expected length of the sequence to a constant value.

This function takes an n-dimensional input array of the form [MAX_LENGTH, batch_size, …] or [batch_size, MAX_LENGTH, …] and returns an array of the same shape.

Parameters
• data (relay.Expr) – The input data.

• valid_length (relay.Expr) – The expected (valid) length of each sequence in the tensor.

• mask_value (float) – The masking value.

• axis (int) – The axis of the length dimension.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

x = [[[  1.,   2.,   3.], [  4.,   5.,   6.]],
[[  7.,   8.,   9.], [ 10.,  11.,  12.]],
[[ 13.,  14.,   15.], [ 16.,  17.,   18.]]]

relay.sequence_mask(x, valid_length=[1, 1]) =
[[[  1.,   2.,   3.], [  4.,   5.,   6.]],
[[  0.,   0.,   0.], [  0.,   0.,   0.]],
[[  0.,   0.,   0.], [  0.,   0.,   0.]]]

[[[  1.,   2.,   3.], [  4.,   5.,   6.]],
[[  7.,   8.,   9.], [  10.,  11.,  12.]],
[[  0.1,  0.1,  0.1], [  16.,  17.,  18.]]]
tvm.relay.shape_of(data, dtype='int32')

Get shape of a tensor.

Parameters
• data (tvm.relay.Expr) – The input tensor.

• dtype (str, optional) – The target data type.

Returns

result – The shape tensor.

Return type

tvm.relay.Expr

tvm.relay.sigmoid(data)

Compute elementwise sigmoid of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.sign(data)

Compute element-wise absolute of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.sin(data)

Compute elementwise sin of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.sinh(data)

Compute elementwise sinh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.slice_like(data, shape_like, axes=None)

Slice the first input with respect to the second input.

For an input array with shape (d1, d2, ..., dk), slice_like operation slices the the input array corresponding size of second array. By default will slice on all axes.

Parameters
• data (tvm.relay.Expr) – The source array.

• shape_like (tvm.relay.Expr) – The new shape.

• axes (Optional[Tuple[int]]) – List of axes on which input data will be sliced according to the corresponding size of the second input. By default will slice on all axes. Negative axes mean counting in reverse.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.sliding_window(data, axis, window_shape, strides)

Slide a window over the data tensor.

Parameters
• data (relay.Expr) – The input data to the operator.

• axis (int) – What axis the window begins sliding over. Window will be slid over this axis and all following axes. The axis value determines the window shape (and thus, the number of strides): window shape and strides must both be of length data.ndim-axis.

• window_shape (List[int]) – The window shape to form over the input. Window shape must be of length data.ndim-axis.

• strides (List[int]) – How to stride the window along each dimension. Strides must be of length data.ndim-axis.

Returns

result – The resulting tensor.

Return type

relay.Expr

Examples

# Slide a window of shape (3, 4, 5) over the x tensor, beginning with
# dimension 1, which slides the window over the two subtensors of
# shape (3, 32, 32).
x = relay.var("x", relay.TensorType((2, 3, 32, 32), "float32"))
y = relay.sliding_window(x, 1, [3, 4, 5], [1, 2, 3])

data = np.random.rand(2, 3, 32, 32).astype("float32")
result = create_executor().evaluate(y, {x: relay.const(data)}).numpy()

# The resulting shape still has batch size 2. Each dimension in
# (1, 15, 10) represents the locations where we were able to
# form a window; that is, we were able to place the window
# in one place along the dimension of length 3, 15 places along
# the dimension of length 32 (when striding by 2), and 10 places
# along the second dimension of length 32 (when striding by 3).
# The remaining dimension (3, 4, 5) represent the formed windows.
assert result.shape == (2, 1, 15, 10, 3, 4, 5)

assert np.array_equal(result[0, 0, 0, 0, :, :, :], data[0, :, 0:4, 0:5])
assert np.array_equal(result[1, 0, 7, 3, :, :, :], data[1, :, 14:18, 9:14])
assert np.array_equal(result[1, 0, 14, 9, :, :, :], data[1, :, 28:32, 27:32])
tvm.relay.sort(data, axis=- 1, is_ascend=1)

Performs sorting along the given axis and returns data in sorted order.

Parameters
• data (relay.Expr) – The input data tensor.

• axis (int, optional) – Axis long which to sort the input tensor.

• is_ascend (boolean, optional) – Whether to sort in ascending or descending order.

Returns

out – Tensor with same shape as data.

Return type

relay.Expr

tvm.relay.sparse_fill_empty_rows(sparse_indices, sparse_values, dense_shape, default_value)

Fill rows in a sparse matrix that do no contain any values. Values are placed in the first column of empty rows. The sparse array is in COO format. It returns a TupleWrapper with 3 outputs

Parameters
• sparse_indices (relay.Expr) – A 2-D tensor[N, ndims] of integers containing location of sparse values, where N is the number of sparse values and n_dim is the number of dimensions of the dense_shape. The first column of this relay parameter must be sorted in ascending order.

• sparse_values (relay.Expr) – A 1-D tensor[N] containing the sparse values for the sparse indices.

• dense_shape (relay.Expr) – A 1-D tensor[ndims] which contains shape of the dense output tensor.

• default_value (relay.Expr) – A 1-D tensor[1] containing the default value for the remaining locations.

Returns

• new_sparse_indices (relay.Expr) – A 2-D tensor[?, ndims] of integers containing location of new sparse indices. The first column outputs must be sorted in ascending order.

• new_sparse_values (relay.Expr) – A 1-D tensor[?] containing the sparse values for the sparse indices.

• empty_row_indicator (relay.Expr) – A 1-D tensor[dense_shape[0]] filled with zeros and ones indicating whether the particular row is empty or full respectively

Note

This op exactly follows the documentation here: https://www.tensorflow.org/api_docs/python/tf/sparse/fill_empty_rows There are two exceptions: 1. Input Sparse Indices are expected to be in row-major order. 2. Empty Row Indicator has int64 output type with 1(for True) and 0(for False).

Examples

sparse_indices = [[0, 1],
[0, 3],
[2, 0],
[3, 1]]
sparse_values = [1, 2, 3, 4]
default_value = [10]
dense_shape = [5, 6]
new_sparse_indices, empty_row_indicator, new_sparse_values, slice_element_index =
relay.sparse_fill_empty_rows(
sparse_indices,
sparse_values,
default_value,
dense_shape)
new_sparse_indices = [[0, 1],
[0, 3],
[1, 0],
[2, 0],
[3, 1],
[4, 0]]
empty_row_indicator = [False, True, False, False, True]
new_sparse_values = [1, 2, 10, 3, 4, 10]
tvm.relay.sparse_reshape(sparse_indices, prev_shape, new_shape)

Reshape a Sparse Tensor. The sparse array is in COO format.

Parameters
• sparse_indices (relay.Expr) – A 2-D tensor[N, n_dim] of integers containing location of sparse values, where N is the number of sparse values and n_dim is the number of dimensions of the dense_shape

• prev_shape (relay.Expr) – A 1-D tensor containing the previous shape of the dense tensor

• new_shape (relay.Expr) – A 1-D tensor containing the new shape of the dense tensor

Returns

result – Output tensor.

Return type

relay.Expr

Examples

sparse_indices = [[0, 0, 0],
[0, 0, 1],
[0, 1, 0],
[1, 0, 0],
[1, 2, 3]]
prev_shape = [2, 3, 4]
new_shape = [9, -1]
new_sparse_indices, new_shape = relay.sparse_reshape(sparse_indices,
prev_shape,
new_shape)
new_sparse_indices = [[0, 0],
[0, 1],
[1, 2],
[4, 2],
[8, 1]]
new_shape = [9, 4]
tvm.relay.sparse_to_dense(sparse_indices, output_shape, sparse_values, default_value=0)

Converts a sparse representation into a dense tensor.

Example:: - sparse_to_dense([[0, 0], [1, 1]], [2, 2], [3, 3], 0) = [[3, 0], [0, 3]]

Parameters
• sparse_indices (relay.Expr) – A 0-D, 1-D, or 2-D tensor of integers containing location of sparse values.

• output_shape (relay.Expr) – A list of integers. Shape of the dense output tensor.

• sparse_values (relay.Expr) – A 0-D or 1-D tensor containing the sparse values for the sparse indices.

• default_value (relay.Expr) – A 0-D tensor containing the default value for the remaining locations. Defaults to 0.

Returns

result – Dense tensor of shape output_shape. Has the same type as sparse_values.

Return type

relay.Expr

tvm.relay.split(data, indices_or_sections, axis=0)

Split input tensor along axis by sections or indices.

If indices_or_sections is an integer, the input will be divided equally along given axis. If such a split is not possible, an error is raised.

If indices_or_sections is a tuple of sorted integers, the entries indicate where along axis the array is split.

Parameters
• data (relay.Expr) – The source array.

• indices_or_sections (int or tuple of int) – Indices or sections to split into. Accepts an int or a tuple

• axis (int, optional) – The axis over which to split.

Returns

ret – The computed result.

Return type

relay.Tuple([relay.Expr, relay.Expr])

tvm.relay.sqrt(data)

Compute elementwise sqrt of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.squeeze(data, axis=None)

Squeeze axes in the array.

Parameters
• data (tvm.relay.Expr) – The input data to the operator.

• axis (None or List[int] or Expr) – The set of axes to remove. If axis = None, remove all axis of dimensions 1. If any specified axis has dimension that does not equal 1, it is an error.

Returns

result – The squeezed result.

Return type

tvm.relay.Expr

tvm.relay.stack(data, axis)

Join a sequence of arrays along a new axis.

Parameters
• data (Union(List[relay.Expr], relay.Expr)) – A list of tensors or a Relay expression that evaluates to a tuple of tensors.

• axis (int) – The axis in the result array along which the input arrays are stacked.

Returns

ret – The stacked tensor.

Return type

relay.Expr

tvm.relay.std(data, axis=None, keepdims=False, exclude=False, unbiased=False)

Computes the standard deviation of data over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a standard deviation operation is performed. The default, axis=None, will compute the standard deviation of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

• unbiased (bool) – If this is set to True, the unbiased estimation will be used.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.stft(data, n_fft, hop_length=None, win_length=None, window=None, normalized=False, onesided=True)

The STFT computes the Fourier transform of short overlapping windows of the input. This gives frequency components of the signal as they change over time.

Parameters
• data (relay.Expr) – Either a 1-D tensor or a 2-D batch tensor.

• n_fft (int) – The size of Fourier transform

• hop_length (int, optional) – The distance between neighboring sliding window frames. If is None, it is treated as equal to floor(n_fft / 4).

• win_length (int, optional) – The size of window frame and STFT filter. If is None, it is treated as equal to n_fft.

• window (relay.Expr, optional) – A 1-D tensor window frame. If is None (default), it is treated as if having 1 everywhere in the window.

• normalized (bool, optional) – Whether to return the normalized STFT results. Default value is False.

• onesided (bool, optional) – Whether to return onesided result or fill with conjugate symmetry. Default value is True.

Returns

output – Tensor containing the STFT result with shape [batch, N, T, 2], where N is the number of frequencies where STFT is applied and T is the total number of frames used.

Return type

relay.Expr

Examples

data = [1, 2, 3, 4, 5, 6]
window = [4, 3, 2]
[n_fft, hop_length, win_length, normalized, onesided] = [3, 3, 3, False, True]
relay.stft(data, n_fft, hop_length, win_length, window, normalized, onesided)
-> [[[15.0000,  0.0000], [34.0000,  0.0000]], [[ 4.5000,  0.8660], [ 1.0000, -1.7321]]]
tvm.relay.strided_set(data, v, begin, end, strides=None)

Strided set of an array.

Parameters
• data (relay.Expr) – The source array to be sliced.

• v (relay.Expr) – The data to be set.

• begin (relay.Expr, Tuple[int], or List[int]) – The indices to begin with in the slicing.

• end (relay.Expr, Tuple[int], or List[int]) – Indices indicating end of the slice.

• strides (relay.Expr, Tuple[int], or List[int], optional) – Specifies the stride values, it can be negative in that case, the input tensor will be reversed in that particular axis.

Returns

ret – The computed result.

Return type

relay.Expr

tvm.relay.strided_slice(data, begin, end, strides=None, axes=None, slice_mode='end')

Strided slice of an array.

Parameters
• data (relay.Expr) – The source array to be sliced.

• begin (relay.Expr, Tuple[int], or List[int]) – The indices to begin with in the slicing.

• end (relay.Expr, Tuple[int], or List[int]) – Indices indicating end of the slice.

• strides (relay.Expr, Tuple[int], or List[int], optional) – Specifies the stride values, it can be negative in that case, the input tensor will be reversed in that particular axis.

• axes (Tuple[int] or List[int], optional) – Axes along which slicing is applied. When it is specified, the length of begin, end, strides, and axes must be equal. Moreover, begin, end, strides, and axes must be static (cannot be relay.Expr). Axes argument for dynamic parameter slicing is not supported yet.

• slice_mode (str, optional) – The slice mode [end, size]. end: The ending indices for the slice [default]. size: The input strides will be ignored, input end in this mode indicates the size of a slice starting at the location specified by begin. If end[i] is -1, all remaining elements in that dimension are included in the slice.

Returns

ret – The computed result.

Return type

relay.Expr

tvm.relay.subtract(lhs, rhs)

Subtraction with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.sum(data, axis=None, keepdims=False, exclude=False)

Computes the sum of array elements over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a sum is performed. The default, axis=None, will sum all of the elements of the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.take(data, indices, axis=None, batch_dims=0, mode='clip')

Take elements from an array along an axis.

Parameters
• data (relay.Expr) – The source array.

• indices (rely.Expr) – The indices of the values to extract.

• axis (int, optional) – The axis over which to select values. By default, the flattened input array is used.

• batch_dims (int) – The number of batch dimensions. By default is 0.

• mode (str, optional) – Specifies how out-of-bound indices will behave [clip, wrap, fast]. clip: clip to the range (default). wrap: wrap around the indices. fast: no clip or wrap around (user must make sure indices are in-bound).

Returns

ret – The computed result.

Return type

relay.Expr

tvm.relay.tan(data)

Compute elementwise tan of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.tanh(data)

Compute element-wise tanh of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.tile(data, reps)

Repeats the whole array multiple times.

Parameters
• data (relay.Expr) – The input data to the operator.

• reps (tuple of int or relay.Expr) – The number of times repeating the tensor data.

Returns

ret – The computed result.

Return type

relay.Expr

Examples

x = [[1, 2], [3, 4]]
relay.tile(x, reps=(2,3)) = [[1., 2., 1., 2., 1., 2.],
[3., 4., 3., 4., 3., 4.],
[1., 2., 1., 2., 1., 2.],
[3., 4., 3., 4., 3., 4.]]

relay.tile(x, reps=(2,)) = [[1., 2., 1., 2.],
[3., 4., 3., 4.]]

Notes

Each dim size of reps must be a positive integer. If reps has length d, the result will have dimension of max(d, data.ndim); If data.ndim < d, data is promoted to be d-dimensional by prepending new axes. If data.ndim >= d, reps is promoted to a.ndim by pre-pending 1’s to it.

tvm.relay.topk(data, k=1, axis=- 1, ret_type='both', is_ascend=False, dtype='int32')

Get the top k elements in an input tensor along the given axis.

ret_type specifies the return type, can be one of (“both”, “values”, “indices”).

Parameters
• data (relay.Expr) – The input data tensor.

• k (int or relay.Expr, optional) – Number of top elements to select. Return all elements if k < 1.

• axis (int, optional) – Axis long which to sort the input tensor.

• ret_type (str, optional) – The return type [both, values, indices]. “both”: return both top k data and indices. “values”: return top k data only. “indices”: return top k indices only.

• is_ascend (boolean, optional) – Whether to sort in ascending or descending order.

• dtype (string, optional) – The data type of the indices output.

Returns

out – The computed result.

Return type

relay.Expr or List[relay.Expr]

tvm.relay.transpose(data, axes=None)

Permutes the dimensions of an array.

Parameters
• data (relay.Expr) – The input data to the operator.

• axes (None or List[int]) – The target axes order, reverse order if not specified.

Returns

result – The transposed result.

Return type

relay.Expr

tvm.relay.trilu(data, k, upper=True)

Given a 2-D matrix or batches of 2-D matrices, returns the upper or lower triangular part of the tensor.

Parameters
• data (relay.Expr) – The tensor that trilu will be applied to. Must be either a 2D matrix or a tensor of batches of 2D matrices.

• k (int) – The number of diagonals above or below the main diagonal to exclude or include.

• upper (bool, optional) – If True, only upper triangular values of input are kept, if False, the lower triangular values are kept.

Returns

ret – The new tensor with appropriate diagonals set to zero.

Return type

relay.Expr

Examples

x = [[0, 1, 2],
[3, 4, 5],
[6, 7, 8]]

relay.trilu(x, True, 0) =
[[0, 1, 2],
[0, 4, 5],
[0, 0, 8]]
tvm.relay.trunc(data)

Compute element-wise trunc of data.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.trunc_divide(lhs, rhs)

Trunc division with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.trunc_mod(lhs, rhs)

Trunc mod with numpy-style broadcasting.

Parameters
• lhs (relay.Expr) – The left hand side input data

• rhs (relay.Expr) – The right hand side input data

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.unique(data, is_sorted=True, return_counts=False)

Find the unique elements of a 1-D tensor. Please note output and counts are all padded to have the same length of data and element with index >= num_unique[0] has undefined value.

Parameters
• data (relay.Expr) – A 1-D tensor of integers.

• is_sorted (bool) – Whether to sort the unique elements in ascending order before returning as output.

• return_counts (bool) – Whether to return the count of each unique element.

Returns

• unique (relay.Expr) – A 1-D tensor containing the unique elements of the input data tensor.

• indices (relay.Expr) – A 1-D tensor containing the index of each data element in the output tensor.

• inverse_indices (relay.Expr) – A 1-D tensor. For each entry in data, it contains the index of that data element in the unique array.

• num_unique (relay.Expr) – A 1-D tensor with size=1 containing the number of unique elements in the input data tensor.

• counts (optional) (relay.Expr) – A 1-D tensor containing the count of each unique element in the output.

Examples

[output, indices, num_unique] = unique([4, 5, 1, 2, 3, 3, 4, 5], False, False)
output         =  [4, 5, 1, 2, 3, _, _, _]
indices        =  [0, 1, 2, 3, 4, 4, 0, 1]
num_unique     =  [5]

[output, indices, num_unique, counts] = unique([4, 5, 1, 2, 3, 3, 4, 5], False, True)
output         =  [4, 5, 1, 2, 3, _, _, _]
indices        =  [0, 1, 2, 3, 4, 4, 0, 1]
num_unique     =  [5]
counts         =  [2, 2, 1, 1, 2, _, _, _]

[output, indices, num_unique] = unique([4, 5, 1, 2, 3, 3, 4, 5], True)
output         =  [1, 2, 3, 4, 5, _, _, _]
indices        =  [3, 4, 0, 1, 2, 2, 3, 4]
num_unique     =  [5]
tvm.relay.unravel_index(indices, shape)

Convert a flat index or array of flat indices into a tuple of coordinate arrays.

Example:: - unravel_index([22, 41, 37], [7, 6]) = [[3, 6, 6],[4, 5, 1]]

Parameters
• indices (relay.Expr) – An integer array containing indices.

• shape (relay.Expr) – The shape of the array.

Returns

result – The tuple of coordinate arrays.

Return type

relay.Expr

tvm.relay.variance(data, axis=None, keepdims=False, exclude=False, unbiased=False)

Computes the variance of data over given axes.

Parameters
• data (relay.Expr) – The input data

• axis (None or int or tuple of int) – Axis or axes along which a variance operation is performed. The default, axis=None, will compute the variance of all elements in the input array. If axis is negative it counts from the last to the first axis.

• keepdims (bool) – If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.

• exclude (bool) – If exclude is true, reduction will be performed on the axes that are NOT in axis instead.

• unbiased (bool) – If this is set to True, the unbiased estimation will be used.

Returns

result – The computed result.

Return type

relay.Expr

tvm.relay.where(condition, x, y)

Selecting elements from either x or y depending on the value of the condition.

Note

Shapes of condition, x, and y must be broadcastable to a common shape. Semantics follow numpy where function https://numpy.org/doc/stable/reference/generated/numpy.where.html

Parameters
• condition (relay.Expr) – Where True, yield x, otherwise yield y

• x (relay.Expr) – The first array or scalar to be selected.

• y (relay.Expr) – The second array or scalar to be selected.

Returns

result – The selected array. The output shape is the broadcasted shape from condition, x, and y.

Return type

relay.Expr

Examples

x = [[1, 2], [3, 4]]
y = [[5, 6], [7, 8]]
condition = [[0, 1], [-1, 0]]
relay.where(conditon, x, y) = [[5, 2], [3, 8]]

condition = [[1], [0]]
relay.where(conditon, x, y) = [[1, 2], [7, 8]]
tvm.relay.zeros(shape, dtype)

Fill array with zeros.

Parameters
• shape (tuple of int or relay.Expr) – The shape of the target.

• dtype (data type) – The data type of the target.

Returns

result – The resulting tensor.

Return type

relay.Expr

tvm.relay.zeros_like(data)

Returns an array of zeros, with same type and shape as the input.

Parameters

data (relay.Expr) – The input data

Returns

result – The computed result.

Return type

relay.Expr

class tvm.relay.ScopeBuilder

Scope builder class.

Enables users to build up a nested scope(let, if) expression easily.

Examples

Methods:

 let(var, value) Create a new let binding. if_scope(cond) Create a new if scope. else_scope() Create a new else scope. type_of(expr) Compute the type of an expression. ret(value) Set the return value of this scope. get() Get the generated result.
let(var, value)

Create a new let binding.

Parameters
• var (Union[Tuple[str, relay.Type], tvm.relay.Var]) – The variable or name of variable.

• value (tvm.relay.Expr) – The value to be bound

if_scope(cond)

Create a new if scope.

Parameters

cond (tvm.relay.expr.Expr) – The condition

Returns

scope – The if scope.

Return type

WithScope

Note

The user must follows with an else scope.

else_scope()

Create a new else scope.

Returns

scope – The if scope.

Return type

WithScope

type_of(expr)

Compute the type of an expression.

Parameters

expr (relay.Expr) – The expression to compute the type of.

ret(value)

Set the return value of this scope.

Parameters

value (tvm.relay.expr.Expr) – The return value.

get()

Get the generated result.

Returns

value – The final result of the expression.

Return type

tvm.relay.expr.Expr

tvm.relay.save_param_dict(params)

Save parameter dictionary to binary bytes.

The result binary bytes can be loaded by the GraphModule with API “load_params”.

Deprecated since version 0.9.0: Use tvm.runtime.save_param_dict() instead.

Parameters

params (dict of str to NDArray) – The parameter dictionary.

Returns

param_bytes – Serialized parameters.

Return type

bytearray

Examples

# set up the parameter dict
params = {"param0": arr0, "param1": arr1}
# save the parameters as byte array
param_bytes = tvm.runtime.save_param_dict(params)
# We can serialize the param_bytes and load it back later.
# Pass in byte array to module to directly set parameters

Load parameter dictionary to binary bytes.

Deprecated since version 0.9.0: Use tvm.runtime.load_param_dict() instead.

Parameters

param_bytes (bytearray) – Serialized parameters.

Returns

params – The parameter dictionary.

Return type

dict of str to NDArray