org.deeplearning4j.nn.layers

Class AbstractLayer<LayerConfT extends Layer>

java.lang.Object

org.deeplearning4j.nn.layers.AbstractLayer<LayerConfT>

All Implemented Interfaces:

Serializable, Cloneable, Layer, Model

Direct Known Subclasses:

ActivationLayer, BaseLayer, Cropping1DLayer, Cropping2DLayer, Cropping3DLayer, GlobalPoolingLayer, LocalResponseNormalization, MaskLayer, SameDiffLayer, SpaceToBatch, SpaceToDepth, Subsampling3DLayer, SubsamplingLayer, Upsampling2D, Upsampling3D, Yolo2OutputLayer, ZeroPadding1DLayer, ZeroPadding3DLayer, ZeroPaddingLayer

public abstract class AbstractLayer<LayerConfT extends Layer>
extends Object
implements Layer

A layer with input and output, no parameters or gradients

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.deeplearning4j.nn.api.Layer

Layer.TrainingMode, Layer.Type

Field Summary

Fields

Modifier and Type	Field and Description
protected CacheMode	cacheMode
protected NeuralNetConfiguration	conf
protected boolean	dropoutApplied
protected org.nd4j.linalg.api.ndarray.INDArray	dropoutMask
protected int	epochCount
protected int	index
protected org.nd4j.linalg.api.ndarray.INDArray	input
protected int	iterationCount
protected org.nd4j.linalg.api.ndarray.INDArray	maskArray
protected MaskState	maskState
protected org.nd4j.linalg.api.ndarray.INDArray	preOutput
protected Collection<TrainingListener>	trainingListeners

Constructor Summary

Constructors

Constructor and Description
AbstractLayer(NeuralNetConfiguration conf)
AbstractLayer(NeuralNetConfiguration conf, org.nd4j.linalg.api.ndarray.INDArray input)

Method Summary

Modifier and Type	Method and Description
void	accumulateScore(double accum) Sets a rolling tally for the score.
org.nd4j.linalg.api.ndarray.INDArray	activate(org.nd4j.linalg.api.ndarray.INDArray input, boolean training, LayerWorkspaceMgr workspaceMgr) Perform forward pass and return the activations array with the specified input
void	addListeners(TrainingListener... listeners) This method ADDS additional TrainingListener to existing listeners
void	applyConstraints(int iteration, int epoch) Apply any constraints to the model
protected void	applyDropOutIfNecessary(boolean training, LayerWorkspaceMgr workspaceMgr)
protected void	applyMask(org.nd4j.linalg.api.ndarray.INDArray to)
void	assertInputSet(boolean backprop)
int	batchSize() The current inputs batch size
double	calcL1(boolean backpropParamsOnly) Calculate the l1 regularization term 0.0 if regularization is not used.
double	calcL2(boolean backpropParamsOnly) Calculate the l2 regularization term 0.0 if regularization is not used.
void	clear() Clear input
abstract Layer	clone() Clone the layer
void	computeGradientAndScore(LayerWorkspaceMgr workspaceMgr) Update the score
NeuralNetConfiguration	conf() The configuration for the neural network
org.nd4j.linalg.primitives.Pair<org.nd4j.linalg.api.ndarray.INDArray,MaskState>	feedForwardMaskArray(org.nd4j.linalg.api.ndarray.INDArray maskArray, MaskState currentMaskState, int minibatchSize) Feed forward the input mask array, setting in in the layer as appropriate.
void	fit() All models have a fit method
void	fit(org.nd4j.linalg.api.ndarray.INDArray input, LayerWorkspaceMgr workspaceMgr) Fit the model to the given data
org.nd4j.linalg.api.ndarray.INDArray	getGradientsViewArray()
int	getIndex() Get the layer index.
org.nd4j.linalg.api.ndarray.INDArray	getInput()
int	getInputMiniBatchSize() Get current/last input mini-batch size, as set by setInputMiniBatchSize(int)
Collection<TrainingListener>	getListeners() Get the iteration listeners for this layer.
org.nd4j.linalg.api.ndarray.INDArray	getMaskArray()
ConvexOptimizer	getOptimizer() Returns this models optimizer
org.nd4j.linalg.api.ndarray.INDArray	getParam(String param) Get the parameter
Gradient	gradient() Get the gradient.
org.nd4j.linalg.primitives.Pair<Gradient,Double>	gradientAndScore() Get the gradient and score
void	init() Init the model
void	initParams() Initialize the parameters
org.nd4j.linalg.api.ndarray.INDArray	input() The input/feature matrix for the model
protected LayerConfT	layerConf()
protected String	layerId()
int	numParams() The number of parameters for the model
int	numParams(boolean backwards) the number of parameters for the model
org.nd4j.linalg.api.ndarray.INDArray	params() Returns the parameters of the neural network as a flattened row vector
Map<String,org.nd4j.linalg.api.ndarray.INDArray>	paramTable() The param table
Map<String,org.nd4j.linalg.api.ndarray.INDArray>	paramTable(boolean backpropParamsOnly) Table of parameters by key, for backprop For many models (dense layers, etc) - all parameters are backprop parameters
double	score() The score for the model
void	setBackpropGradientsViewArray(org.nd4j.linalg.api.ndarray.INDArray gradients) Set the gradients array as a view of the full (backprop) network parameters NOTE: this is intended to be used internally in MultiLayerNetwork and ComputationGraph, not by users.
void	setCacheMode(CacheMode mode) This method sets given CacheMode for current layer
void	setConf(NeuralNetConfiguration conf) Setter for the configuration
void	setIndex(int index) Set the layer index.
void	setInput(org.nd4j.linalg.api.ndarray.INDArray input, LayerWorkspaceMgr workspaceMgr) Set the layer input.
void	setInputMiniBatchSize(int size) Set current/last input mini-batch size. Used for score and gradient calculations.
void	setListeners(Collection<TrainingListener> listeners) Set the iteration listeners for this layer.
void	setListeners(TrainingListener... listeners) Set the iteration listeners for this layer.
void	setMaskArray(org.nd4j.linalg.api.ndarray.INDArray maskArray) Set the mask array.
void	setParam(String key, org.nd4j.linalg.api.ndarray.INDArray val) Set the parameter with a new ndarray
void	setParams(org.nd4j.linalg.api.ndarray.INDArray params) Set the parameters for this model.
protected void	setParams(org.nd4j.linalg.api.ndarray.INDArray params, char order)
void	setParamsViewArray(org.nd4j.linalg.api.ndarray.INDArray params) Set the initial parameters array as a view of the full (backprop) network parameters NOTE: this is intended to be used internally in MultiLayerNetwork and ComputationGraph, not by users.
void	setParamTable(Map<String,org.nd4j.linalg.api.ndarray.INDArray> paramTable) Setter for the param table
Layer	transpose() Return a transposed copy of the weights/bias (this means reverse the number of inputs and outputs on the weights)
Layer.Type	type() Returns the layer type
void	update(Gradient gradient) Update layer weights and biases with gradient change
void	update(org.nd4j.linalg.api.ndarray.INDArray gradient, String paramType) Perform one update applying the gradient
void	validateInput() Validate the input

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.deeplearning4j.nn.api.Layer

activate, backpropGradient, clearNoiseWeightParams, getEpochCount, getIterationCount, isPretrainLayer, setEpochCount, setIterationCount

Field Detail

input

protected org.nd4j.linalg.api.ndarray.INDArray input

preOutput

protected org.nd4j.linalg.api.ndarray.INDArray preOutput

conf

protected NeuralNetConfiguration conf

dropoutMask

protected org.nd4j.linalg.api.ndarray.INDArray dropoutMask

dropoutApplied

protected boolean dropoutApplied

trainingListeners

protected Collection<TrainingListener> trainingListeners

index

protected int index

maskArray

protected org.nd4j.linalg.api.ndarray.INDArray maskArray

maskState

protected MaskState maskState

cacheMode

protected CacheMode cacheMode

iterationCount

protected int iterationCount

epochCount

protected int epochCount

Constructor Detail

AbstractLayer

public AbstractLayer(NeuralNetConfiguration conf)

AbstractLayer

public AbstractLayer(NeuralNetConfiguration conf,
                     org.nd4j.linalg.api.ndarray.INDArray input)

Method Detail

setCacheMode

public void setCacheMode(CacheMode mode)

Description copied from interface: Layer

This method sets given CacheMode for current layer

Specified by:

setCacheMode in interface Layer

layerConf

protected LayerConfT layerConf()

layerId

protected String layerId()

getInput

public org.nd4j.linalg.api.ndarray.INDArray getInput()

init

public void init()

Init the model

Specified by:

init in interface Model

clone

public abstract Layer clone()

Description copied from interface: Layer

Clone the layer

Specified by:

clone in interface Layer

Overrides:

clone in class Object

Returns:

setInput

public void setInput(org.nd4j.linalg.api.ndarray.INDArray input,
                     LayerWorkspaceMgr workspaceMgr)

Description copied from interface: Layer

Set the layer input.

Specified by:

setInput in interface Layer

getIndex

public int getIndex()

Description copied from interface: Layer

Get the layer index.

Specified by:

getIndex in interface Layer

setIndex

public void setIndex(int index)

Description copied from interface: Layer

Set the layer index.

Specified by:

setIndex in interface Layer

getListeners

public Collection<TrainingListener> getListeners()

Description copied from interface: Layer

Get the iteration listeners for this layer.

Specified by:

getListeners in interface Layer

setListeners

public void setListeners(Collection<TrainingListener> listeners)

Description copied from interface: Layer

Set the iteration listeners for this layer.

Specified by:

setListeners in interface Layer

Specified by:

setListeners in interface Model

addListeners

public void addListeners(TrainingListener... listeners)

This method ADDS additional TrainingListener to existing listeners

Specified by:

addListeners in interface Model

Parameters:

listeners -

setListeners

public void setListeners(TrainingListener... listeners)

Description copied from interface: Layer

Set the iteration listeners for this layer.

Specified by:

setListeners in interface Layer

Specified by:

setListeners in interface Model

computeGradientAndScore

public void computeGradientAndScore(LayerWorkspaceMgr workspaceMgr)

Description copied from interface: Model

Update the score

Specified by:

computeGradientAndScore in interface Model

update

public void update(Gradient gradient)

Description copied from interface: Model

Update layer weights and biases with gradient change

Specified by:

update in interface Model

update

public void update(org.nd4j.linalg.api.ndarray.INDArray gradient,
                   String paramType)

Description copied from interface: Model

Perform one update applying the gradient

Specified by:

update in interface Model

Parameters:

gradient - the gradient to apply

getOptimizer

public ConvexOptimizer getOptimizer()

Description copied from interface: Model

Returns this models optimizer

Specified by:

getOptimizer in interface Model

Returns:

this models optimizer

setConf

public void setConf(NeuralNetConfiguration conf)

Description copied from interface: Model

Setter for the configuration

Specified by:

setConf in interface Model

params

public org.nd4j.linalg.api.ndarray.INDArray params()

Returns the parameters of the neural network as a flattened row vector

Specified by:

params in interface Model

Returns:

the parameters of the neural network

getParam

public org.nd4j.linalg.api.ndarray.INDArray getParam(String param)

Description copied from interface: Model

Get the parameter

Specified by:

getParam in interface Model

Parameters:

param - the key of the parameter

Returns:

the parameter vector/matrix with that particular key

setParam

public void setParam(String key,
                     org.nd4j.linalg.api.ndarray.INDArray val)

Description copied from interface: Model

Set the parameter with a new ndarray

Specified by:

setParam in interface Model

Parameters:

key - the key to se t

val - the new ndarray

setParams

public void setParams(org.nd4j.linalg.api.ndarray.INDArray params)

Description copied from interface: Model

Set the parameters for this model. This expects a linear ndarray which then be unpacked internally relative to the expected ordering of the model

Specified by:

setParams in interface Model

Parameters:

params - the parameters for the model

setParams

protected void setParams(org.nd4j.linalg.api.ndarray.INDArray params,
                         char order)

setParamsViewArray

public void setParamsViewArray(org.nd4j.linalg.api.ndarray.INDArray params)

Description copied from interface: Model

Set the initial parameters array as a view of the full (backprop) network parameters NOTE: this is intended to be used internally in MultiLayerNetwork and ComputationGraph, not by users.

Specified by:

setParamsViewArray in interface Model

Parameters:

params - a 1 x nParams row vector that is a view of the larger (MLN/CG) parameters array

getGradientsViewArray

public org.nd4j.linalg.api.ndarray.INDArray getGradientsViewArray()

Specified by:

getGradientsViewArray in interface Model

setBackpropGradientsViewArray

public void setBackpropGradientsViewArray(org.nd4j.linalg.api.ndarray.INDArray gradients)

Description copied from interface: Model

Set the gradients array as a view of the full (backprop) network parameters NOTE: this is intended to be used internally in MultiLayerNetwork and ComputationGraph, not by users.

Specified by:

setBackpropGradientsViewArray in interface Model

Parameters:

gradients - a 1 x nParams row vector that is a view of the larger (MLN/CG) gradients array

setParamTable

public void setParamTable(Map<String,org.nd4j.linalg.api.ndarray.INDArray> paramTable)

Description copied from interface: Model

Setter for the param table

Specified by:

setParamTable in interface Model

initParams

public void initParams()

Description copied from interface: Model

Initialize the parameters

Specified by:

initParams in interface Model

paramTable

public Map<String,org.nd4j.linalg.api.ndarray.INDArray> paramTable()

Description copied from interface: Model

The param table

Specified by:

paramTable in interface Model

Returns:

paramTable

public Map<String,org.nd4j.linalg.api.ndarray.INDArray> paramTable(boolean backpropParamsOnly)

Description copied from interface: Model

Table of parameters by key, for backprop For many models (dense layers, etc) - all parameters are backprop parameters

Specified by:

paramTable in interface Model

Parameters:

backpropParamsOnly - If true, return backprop params only. If false: return all params (equivalent to paramsTable())

applyMask

protected void applyMask(org.nd4j.linalg.api.ndarray.INDArray to)

activate

public org.nd4j.linalg.api.ndarray.INDArray activate(org.nd4j.linalg.api.ndarray.INDArray input,
                                                     boolean training,
                                                     LayerWorkspaceMgr workspaceMgr)

Description copied from interface: Layer

Perform forward pass and return the activations array with the specified input

Specified by:

activate in interface Layer

Parameters:

input - the input to use

training - train or test mode

workspaceMgr - Workspace manager.

Returns:

Activations array. Note that the returned array should be placed in the ArrayType.ACTIVATIONS workspace via the workspace manager

calcL2

public double calcL2(boolean backpropParamsOnly)

Description copied from interface: Layer

Calculate the l2 regularization term
0.0 if regularization is not used. Or 0.5 * l2Coeff * l2Magnitude otherwise.
Note that this does not divide by mini-batch size

Specified by:

calcL2 in interface Layer

Parameters:

backpropParamsOnly - If true: calculate L2 based on backprop params only. If false: calculate based on all params (including pretrain params, if any)

Returns:

the l2 regularization term for this layer.

calcL1

public double calcL1(boolean backpropParamsOnly)

Description copied from interface: Layer

Calculate the l1 regularization term
0.0 if regularization is not used. Or l1Coeff * l1Magnitude otherwise.
Note that this does not divide by mini-batch size

Specified by:

calcL1 in interface Layer

Parameters:

backpropParamsOnly - If true: calculate L1 based on backprop params only. If false: calculate based on all params (including pretrain params, if any)

Returns:

the l1 regularization term for this layer.

batchSize

public int batchSize()

Description copied from interface: Model

The current inputs batch size

Specified by:

batchSize in interface Model

Returns:

the current inputs batch size

conf

public NeuralNetConfiguration conf()

Description copied from interface: Model

The configuration for the neural network

Specified by:

conf in interface Model

Returns:

the configuration for the neural network

clear

public void clear()

Description copied from interface: Model

Clear input

Specified by:

clear in interface Model

applyDropOutIfNecessary

protected void applyDropOutIfNecessary(boolean training,
                                       LayerWorkspaceMgr workspaceMgr)

type

public Layer.Type type()

Description copied from interface: Layer

Returns the layer type

Specified by:

type in interface Layer

Returns:

numParams

public int numParams()

The number of parameters for the model

Specified by:

numParams in interface Model

Returns:

the number of parameters for the model

numParams

public int numParams(boolean backwards)

Description copied from interface: Model

the number of parameters for the model

Specified by:

numParams in interface Model

Returns:

the number of parameters for the model

fit

public void fit(org.nd4j.linalg.api.ndarray.INDArray input,
                LayerWorkspaceMgr workspaceMgr)

Description copied from interface: Model

Fit the model to the given data

Specified by:

fit in interface Model

Parameters:

input - the data to fit the model to

gradientAndScore

public org.nd4j.linalg.primitives.Pair<Gradient,Double> gradientAndScore()

Description copied from interface: Model

Get the gradient and score

Specified by:

gradientAndScore in interface Model

Returns:

the gradient and score

input

public org.nd4j.linalg.api.ndarray.INDArray input()

Description copied from interface: Model

The input/feature matrix for the model

Specified by:

input in interface Model

Returns:

the input/feature matrix for the model

validateInput

public void validateInput()

Description copied from interface: Model

Validate the input

Specified by:

validateInput in interface Model

transpose

public Layer transpose()

Description copied from interface: Layer

Return a transposed copy of the weights/bias (this means reverse the number of inputs and outputs on the weights)

Specified by:

transpose in interface Layer

Returns:

the transposed layer

setInputMiniBatchSize

public void setInputMiniBatchSize(int size)

Description copied from interface: Layer

Set current/last input mini-batch size.
Used for score and gradient calculations. Mini batch size may be different from getInput().size(0) due to reshaping operations - for example, when using RNNs with DenseLayer and OutputLayer. Called automatically during forward pass.

Specified by:

setInputMiniBatchSize in interface Layer

getInputMiniBatchSize

public int getInputMiniBatchSize()

Description copied from interface: Layer

Get current/last input mini-batch size, as set by setInputMiniBatchSize(int)

Specified by:

getInputMiniBatchSize in interface Layer

See Also:

Layer.setInputMiniBatchSize(int)

setMaskArray

public void setMaskArray(org.nd4j.linalg.api.ndarray.INDArray maskArray)

Description copied from interface: Layer

Set the mask array. Note: In general, Layer.feedForwardMaskArray(INDArray, MaskState, int) should be used in preference to this.

Specified by:

setMaskArray in interface Layer

Parameters:

maskArray - Mask array to set

getMaskArray

public org.nd4j.linalg.api.ndarray.INDArray getMaskArray()

Specified by:

getMaskArray in interface Layer

feedForwardMaskArray

public org.nd4j.linalg.primitives.Pair<org.nd4j.linalg.api.ndarray.INDArray,MaskState> feedForwardMaskArray(org.nd4j.linalg.api.ndarray.INDArray maskArray,
                                                                                                            MaskState currentMaskState,
                                                                                                            int minibatchSize)

Description copied from interface: Layer

Feed forward the input mask array, setting in in the layer as appropriate. This allows different layers to handle masks differently - for example, bidirectional RNNs and normal RNNs operate differently with masks (the former sets activations to 0 outside of the data present region (and keeps the mask active for future layers like dense layers), whereas normal RNNs don't zero out the activations/errors )instead relying on backpropagated error arrays to handle the variable length case.
This is also used for example for networks that contain global pooling layers, arbitrary preprocessors, etc.

Specified by:

feedForwardMaskArray in interface Layer

Parameters:

maskArray - Mask array to set

currentMaskState - Current state of the mask - see MaskState

minibatchSize - Current minibatch size. Needs to be known as it cannot always be inferred from the activations array due to reshaping (such as a DenseLayer within a recurrent neural network)

Returns:

New mask array after this layer, along with the new mask state.

gradient

public Gradient gradient()

Description copied from interface: Model

Get the gradient. Note that this method will not calculate the gradient, it will rather return the gradient that has been computed before. For calculating the gradient, see Model#computeGradientAndScore() .

Specified by:

gradient in interface Model

Returns:

the gradient for this model, as calculated before

fit

public void fit()

Description copied from interface: Model

All models have a fit method

Specified by:

fit in interface Model

score

public double score()

Description copied from interface: Model

The score for the model

Specified by:

score in interface Model

Returns:

the score for the model

accumulateScore

public void accumulateScore(double accum)

Description copied from interface: Model

Sets a rolling tally for the score. This is useful for mini batch learning when you are accumulating error across a dataset.

Specified by:

accumulateScore in interface Model

Parameters:

accum - the amount to accum

applyConstraints

public void applyConstraints(int iteration,
                             int epoch)

Description copied from interface: Model

Apply any constraints to the model

Specified by:

applyConstraints in interface Model

assertInputSet

public void assertInputSet(boolean backprop)