Package com.yahoo.tensor.functions

Class Reduce<NAMETYPE extends Name>

java.lang.Object

com.yahoo.tensor.functions.TensorFunction<NAMETYPE>

com.yahoo.tensor.functions.PrimitiveTensorFunction<NAMETYPE>

com.yahoo.tensor.functions.Reduce<NAMETYPE>

public class Reduce<NAMETYPE extends Name>
extends PrimitiveTensorFunction<NAMETYPE>

The reduce tensor operation returns a tensor produced from the argument tensor where some dimensions are collapsed to a single value using an aggregator function.

Author:

bratseth

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Reduce.Aggregator

Constructor Summary

Constructors

Constructor	Description
Reduce(TensorFunction<NAMETYPE> argument, Reduce.Aggregator aggregator)	Creates a reduce function reducing all dimensions
Reduce(TensorFunction<NAMETYPE> argument, Reduce.Aggregator aggregator, String dimension)	Creates a reduce function reducing a single dimension
Reduce(TensorFunction<NAMETYPE> argument, Reduce.Aggregator aggregator, List<String> dimensions)	Creates a reduce function.

Method Summary

Modifier and Type	Method	Description
TensorFunction<NAMETYPE>	argument()
List<TensorFunction<NAMETYPE>>	arguments()	Returns the function arguments of this node in the order they are applied
Tensor	evaluate(EvaluationContext<NAMETYPE> context)	Evaluates this tensor.
int	hashCode()	Returns a hashcode computed from the data in this
static TensorType	outputType(TensorType inputType, List<String> reduceDimensions)
PrimitiveTensorFunction<NAMETYPE>	toPrimitive()	Translate this function - and all of its arguments recursively - to a tree of primitive functions only.
String	toString(ToStringContext<NAMETYPE> context)	Return a string representation of this context.
TensorType	type(TypeContext<NAMETYPE> context)	Returns the type of the tensor this produces given the input types in the context
TensorFunction<NAMETYPE>	withArguments(List<TensorFunction<NAMETYPE>> arguments)	Returns a copy of this tensor function with the arguments replaced by the given list of arguments.

Methods inherited from class com.yahoo.tensor.functions.TensorFunction

asScalarFunction, evaluate, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

Reduce

public Reduce(TensorFunction<NAMETYPE> argument,
 Reduce.Aggregator aggregator)

Creates a reduce function reducing all dimensions

Reduce

public Reduce(TensorFunction<NAMETYPE> argument,
 Reduce.Aggregator aggregator,
 String dimension)

Creates a reduce function reducing a single dimension

Reduce

public Reduce(TensorFunction<NAMETYPE> argument,
 Reduce.Aggregator aggregator,
 List<String> dimensions)

Creates a reduce function.

Parameters:

argument - the tensor to reduce

aggregator - the aggregator function to use

dimensions - the list of dimensions to remove. If an empty list is given, all dimensions are reduced, producing a dimensionless tensor (a scalar).

Throws:

IllegalArgumentException - if any of the tensor dimensions are not present in the input tensor

Method Details

outputType

public static TensorType outputType(TensorType inputType,
 List<String> reduceDimensions)

argument

public TensorFunction<NAMETYPE> argument()

arguments

public List<TensorFunction<NAMETYPE>> arguments()

Description copied from class: TensorFunction

Returns the function arguments of this node in the order they are applied

Specified by:

arguments in class TensorFunction<NAMETYPE extends Name>

withArguments

public TensorFunction<NAMETYPE> withArguments(List<TensorFunction<NAMETYPE>> arguments)

Description copied from class: TensorFunction

Returns a copy of this tensor function with the arguments replaced by the given list of arguments.

Specified by:

withArguments in class TensorFunction<NAMETYPE extends Name>

toPrimitive

public PrimitiveTensorFunction<NAMETYPE> toPrimitive()

Description copied from class: TensorFunction

Translate this function - and all of its arguments recursively - to a tree of primitive functions only.

Specified by:

toPrimitive in class TensorFunction<NAMETYPE extends Name>

Returns:

a tree of primitive functions implementing this

toString

public String toString(ToStringContext<NAMETYPE> context)

Description copied from class: TensorFunction

Return a string representation of this context.

Specified by:

toString in class TensorFunction<NAMETYPE extends Name>

Parameters:

context - a context which must be passed to all nested functions when requesting the string value

type

public TensorType type(TypeContext<NAMETYPE> context)

Description copied from class: TensorFunction

Returns the type of the tensor this produces given the input types in the context

Specified by:

type in class TensorFunction<NAMETYPE extends Name>

Parameters:

context - a context which must be passed to all nexted functions when evaluating

evaluate

public Tensor evaluate(EvaluationContext<NAMETYPE> context)

Description copied from class: TensorFunction

Evaluates this tensor.

Specified by:

evaluate in class TensorFunction<NAMETYPE extends Name>

Parameters:

context - a context which must be passed to all nested functions when evaluating

hashCode

public int hashCode()

Description copied from class: TensorFunction

Returns a hashcode computed from the data in this

Specified by:

hashCode in class TensorFunction<NAMETYPE extends Name>