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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.linalg.activations;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.linalg.activations.impl.*;
/**
* This enum is the factory for the activation function.
*
* Created by susaneraly on 12/8/16.
*/
public enum Activation {
CUBE, ELU, HARDSIGMOID, HARDTANH, IDENTITY, LEAKYRELU, RATIONALTANH, RELU, RELU6,
RRELU, SIGMOID, SOFTMAX, SOFTPLUS, SOFTSIGN, TANH, RECTIFIEDTANH, SELU, SWISH,
THRESHOLDEDRELU, GELU;
/**
* Creates an instance of the activation function
*
* @return an instance of the activation function
*/
public IActivation getActivationFunction() {
switch (this) {
case CUBE:
return new ActivationCube();
case ELU:
return new ActivationELU();
case HARDSIGMOID:
return new ActivationHardSigmoid();
case HARDTANH:
return new ActivationHardTanH();
case IDENTITY:
return new ActivationIdentity();
case LEAKYRELU:
return new ActivationLReLU();
case RATIONALTANH:
return new ActivationRationalTanh();
case RECTIFIEDTANH:
return new ActivationRectifiedTanh();
case RELU:
return new ActivationReLU();
case RELU6:
return new ActivationReLU6();
case SELU:
return new ActivationSELU();
case SWISH:
return new ActivationSwish();
case RRELU:
return new ActivationRReLU();
case SIGMOID:
return new ActivationSigmoid();
case SOFTMAX:
return new ActivationSoftmax();
case SOFTPLUS:
return new ActivationSoftPlus();
case SOFTSIGN:
return new ActivationSoftSign();
case TANH:
return new ActivationTanH();
case THRESHOLDEDRELU:
return new ActivationThresholdedReLU();
case GELU:
return new ActivationGELU();
default:
throw new UnsupportedOperationException("Unknown or not supported activation function: " + this);
}
}
/**
* Returns the activation function enum value
*
* @param name the case-insensitive opName of the activation function
* @return the activation function enum value
*/
public static Activation fromString(String name) {
return Activation.valueOf(name.toUpperCase());
}
/**
* Get the Activation as a SameDiff variable
*
* @param sd SameDiff instance
* @param input Input variable to apply the activation function to
* @return SDVariable: output after applying the activation function
* @see #asSameDiff(SameDiff, SDVariable)
*/
public SDVariable asSameDiff(SameDiff sd, SDVariable input) {
return asSameDiff(null, sd, input);
}
/**
* Get the Activation as a SameDiff variable
*
* @param variableName Variable name
* @param sd SameDiff instance
* @param input Input variable to apply the activation function to
* @return SDVariable: output after applying the activation function
*/
public SDVariable asSameDiff(String variableName, SameDiff sd, SDVariable input) {
switch (this) {
case CUBE:
return sd.math().pow(variableName, input, 3.0);
case ELU:
return sd.nn().elu(variableName, input);
case HARDTANH:
return sd.nn().hardTanh(variableName, input);
case IDENTITY:
return sd.identity(variableName, input);
case LEAKYRELU:
return sd.nn().leakyRelu(variableName, input, 0.0);
case RELU:
return sd.nn().relu(variableName, input, 0.0);
case SIGMOID:
return sd.nn().sigmoid(variableName, input);
case SOFTMAX:
return sd.nn().softmax(variableName, input);
case SOFTPLUS:
return sd.nn().softplus(variableName, input);
case SOFTSIGN:
return sd.nn().softsign(variableName, input);
case TANH:
return sd.math().tanh(variableName, input);
case GELU:
return sd.nn().gelu(variableName, input);
case HARDSIGMOID:
case RATIONALTANH:
case RRELU:
case RECTIFIEDTANH:
case SELU:
case SWISH:
default:
throw new UnsupportedOperationException("Activation function not yet supported: " + this);
}
}
}
