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RectifiedLinearComponent Class Reference

#include <nnet-component.h>

Inheritance diagram for RectifiedLinearComponent:
Collaboration diagram for RectifiedLinearComponent:

Public Member Functions

 RectifiedLinearComponent (int32 dim)
 
 RectifiedLinearComponent (const RectifiedLinearComponent &other)
 
 RectifiedLinearComponent ()
 
virtual std::string Type () const
 
virtual ComponentCopy () const
 Copy component (deep copy). More...
 
virtual bool BackpropNeedsInput () const
 
virtual bool BackpropNeedsOutput () const
 
virtual void Propagate (const ChunkInfo &in_info, const ChunkInfo &out_info, const CuMatrixBase< BaseFloat > &in, CuMatrixBase< BaseFloat > *out) const
 Perform forward pass propagation Input->Output. More...
 
virtual void Backprop (const ChunkInfo &in_info, const ChunkInfo &out_info, const CuMatrixBase< BaseFloat > &in_value, const CuMatrixBase< BaseFloat > &out_value, const CuMatrixBase< BaseFloat > &out_deriv, Component *to_update, CuMatrix< BaseFloat > *in_deriv) const
 Perform backward pass propagation of the derivative, and also either update the model (if to_update == this) or update another model or compute the model derivative (otherwise). More...
 
- Public Member Functions inherited from NonlinearComponent
void Init (int32 dim)
 
 NonlinearComponent (int32 dim)
 
 NonlinearComponent ()
 
 NonlinearComponent (const NonlinearComponent &other)
 
virtual int32 InputDim () const
 Get size of input vectors. More...
 
virtual int32 OutputDim () const
 Get size of output vectors. More...
 
virtual void InitFromString (std::string args)
 We implement InitFromString at this level. More...
 
virtual void Read (std::istream &is, bool binary)
 We implement Read at this level as it just needs the Type(). More...
 
virtual void Write (std::ostream &os, bool binary) const
 Write component to stream. More...
 
void Scale (BaseFloat scale)
 
void Add (BaseFloat alpha, const NonlinearComponent &other)
 
const CuVector< double > & ValueSum () const
 
const CuVector< double > & DerivSum () const
 
double Count () const
 
void SetDim (int32 dim)
 
- Public Member Functions inherited from Component
 Component ()
 
virtual int32 Index () const
 Returns the index in the sequence of layers in the neural net; intended only to be used in debugging information. More...
 
virtual void SetIndex (int32 index)
 
virtual std::vector< int32 > Context () const
 Return a vector describing the temporal context this component requires for each frame of output, as a sorted list. More...
 
void Propagate (const ChunkInfo &in_info, const ChunkInfo &out_info, const CuMatrixBase< BaseFloat > &in, CuMatrix< BaseFloat > *out) const
 A non-virtual propagate function that first resizes output if necessary. More...
 
virtual std::string Info () const
 
virtual ~Component ()
 

Private Member Functions

RectifiedLinearComponentoperator= (const RectifiedLinearComponent &other)
 

Additional Inherited Members

- Static Public Member Functions inherited from Component
static ComponentReadNew (std::istream &is, bool binary)
 Read component from stream. More...
 
static ComponentNewFromString (const std::string &initializer_line)
 Initialize the Component from one line that will contain first the type, e.g. More...
 
static ComponentNewComponentOfType (const std::string &type)
 Return a new Component of the given type e.g. More...
 
- Protected Member Functions inherited from NonlinearComponent
void UpdateStats (const CuMatrixBase< BaseFloat > &out_value, const CuMatrixBase< BaseFloat > *deriv=NULL)
 
const NonlinearComponentoperator= (const NonlinearComponent &other)
 
- Protected Attributes inherited from NonlinearComponent
int32 dim_
 
CuVector< double > value_sum_
 
CuVector< double > deriv_sum_
 
double count_
 
std::mutex mutex_
 

Detailed Description

Definition at line 676 of file nnet-component.h.

Constructor & Destructor Documentation

RectifiedLinearComponent ( int32  dim)
inlineexplicit

Definition at line 678 of file nnet-component.h.

RectifiedLinearComponent ( const RectifiedLinearComponent other)
inlineexplicit

Definition at line 679 of file nnet-component.h.

Definition at line 680 of file nnet-component.h.

Referenced by RectifiedLinearComponent::Copy().

680 { }

Member Function Documentation

void Backprop ( const ChunkInfo in_info,
const ChunkInfo out_info,
const CuMatrixBase< BaseFloat > &  in_value,
const CuMatrixBase< BaseFloat > &  out_value,
const CuMatrixBase< BaseFloat > &  out_deriv,
Component to_update,
CuMatrix< BaseFloat > *  in_deriv 
) const
virtual

Perform backward pass propagation of the derivative, and also either update the model (if to_update == this) or update another model or compute the model derivative (otherwise).

Note: in_value and out_value are the values of the input and output of the component, and these may be dummy variables if respectively BackpropNeedsInput() or BackpropNeedsOutput() return false for that component (not all components need these).

num_chunks lets us treat the input matrix as contiguous-in-time chunks of equal size; it only matters if splicing is involved.

Implements Component.

Definition at line 778 of file nnet-component.cc.

References CuMatrixBase< Real >::ApplyHeaviside(), CuMatrixBase< Real >::CopyFromMat(), kaldi::kUndefined, CuMatrixBase< Real >::MulElements(), CuMatrixBase< Real >::NumCols(), CuMatrixBase< Real >::NumRows(), CuMatrix< Real >::Resize(), and NonlinearComponent::UpdateStats().

784  {
785 
786  in_deriv->Resize(out_deriv.NumRows(), out_deriv.NumCols(),
787  kUndefined);
788  in_deriv->CopyFromMat(out_value);
789  in_deriv->ApplyHeaviside();
790  // Now in_deriv(i, j) equals (out_value(i, j) > 0.0 ? 1.0 : 0.0),
791  // which is the derivative of the nonlinearity (well, except at zero
792  // where it's undefined).
793  if (to_update != NULL)
794  dynamic_cast<NonlinearComponent*>(to_update)->UpdateStats(out_value,
795  in_deriv);
796  in_deriv->MulElements(out_deriv);
797 }
MatrixIndexT NumCols() const
Definition: cu-matrix.h:196
void CopyFromMat(const MatrixBase< OtherReal > &src, MatrixTransposeType trans=kNoTrans)
Definition: cu-matrix.cc:337
void UpdateStats(const CuMatrixBase< BaseFloat > &out_value, const CuMatrixBase< BaseFloat > *deriv=NULL)
void Resize(MatrixIndexT rows, MatrixIndexT cols, MatrixResizeType resize_type=kSetZero, MatrixStrideType stride_type=kDefaultStride)
Allocate the memory.
Definition: cu-matrix.cc:47
MatrixIndexT NumRows() const
Dimensions.
Definition: cu-matrix.h:195
void MulElements(const CuMatrixBase< Real > &A)
Multiply two matrices elementwise: C = C .* A.
Definition: cu-matrix.cc:652
void ApplyHeaviside()
For each element, sets x = (x > 0 ? 1.0 : 0.0).
Definition: cu-matrix.cc:2307
virtual bool BackpropNeedsInput ( ) const
inlinevirtual

Reimplemented from Component.

Definition at line 683 of file nnet-component.h.

683 { return false; }
virtual bool BackpropNeedsOutput ( ) const
inlinevirtual

Reimplemented from Component.

Definition at line 684 of file nnet-component.h.

684 { return true; }
virtual Component* Copy ( ) const
inlinevirtual

Copy component (deep copy).

Implements Component.

Definition at line 682 of file nnet-component.h.

References RectifiedLinearComponent::RectifiedLinearComponent().

RectifiedLinearComponent& operator= ( const RectifiedLinearComponent other)
private
void Propagate ( const ChunkInfo in_info,
const ChunkInfo out_info,
const CuMatrixBase< BaseFloat > &  in,
CuMatrixBase< BaseFloat > *  out 
) const
virtual

Perform forward pass propagation Input->Output.

Each row is one frame or training example. Interpreted as "num_chunks" equally sized chunks of frames; this only matters for layers that do things like context splicing. Typically this variable will either be 1 (when we're processing a single contiguous chunk of data) or will be the same as in.NumFrames(), but other values are possible if some layers do splicing.

Implements Component.

Definition at line 769 of file nnet-component.cc.

References CuMatrixBase< Real >::ApplyFloor(), and CuMatrixBase< Real >::CopyFromMat().

772  {
773  // Apply rectified linear function (x >= 0 ? 1.0 : 0.0)
774  out->CopyFromMat(in);
775  out->ApplyFloor(0.0);
776 }
void CopyFromMat(const MatrixBase< OtherReal > &src, MatrixTransposeType trans=kNoTrans)
Definition: cu-matrix.cc:337
void ApplyFloor(Real floor_val)
Definition: cu-matrix.cc:2365
virtual std::string Type ( ) const
inlinevirtual

Implements Component.

Definition at line 681 of file nnet-component.h.

681 { return "RectifiedLinearComponent"; }

The documentation for this class was generated from the following files: