org.nd4j.linalg.api.ops.random.impl.BinomialDistribution Maven / Gradle / Ivy
/*******************************************************************************
* 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.api.ops.random.impl;
import lombok.NonNull;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.random.BaseRandomOp;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* This Op generates binomial distribution
*
* @author [email protected]
*/
public class BinomialDistribution extends BaseRandomOp {
private int trials;
private double probability;
public BinomialDistribution(SameDiff sd, int trials, double probability, long[] shape){
super(sd, shape);
this.trials = trials;
this.probability = probability;
this.extraArgs = new Object[] {(double) this.trials, this.probability};
}
public BinomialDistribution() {
super();
}
/**
* This op fills Z with binomial distribution over given trials with single given probability for all trials
* @param z
* @param trials
* @param probability
*/
public BinomialDistribution(@NonNull INDArray z, int trials, double probability) {
init(z, z, z, z.lengthLong());
this.trials = trials;
this.probability = probability;
this.extraArgs = new Object[] {(double) this.trials, this.probability};
}
/**
* This op fills Z with binomial distribution over given trials with probability for each trial given as probabilities INDArray
* @param z
* @param trials
* @param probabilities array with probability value for each trial
*/
public BinomialDistribution(@NonNull INDArray z, int trials, @NonNull INDArray probabilities) {
if (trials > probabilities.lengthLong())
throw new IllegalStateException("Number of trials is > then amount of probabilities provided");
if (probabilities.elementWiseStride() < 1)
throw new IllegalStateException("Probabilities array shouldn't have negative elementWiseStride");
init(z, probabilities, z, z.lengthLong());
this.trials = trials;
this.probability = 0.0;
this.extraArgs = new Object[] {(double) this.trials, this.probability};
}
/**
* This op fills Z with binomial distribution over given trials with probability for each trial given as probabilities INDArray
*
* @param z
* @param probabilities
*/
public BinomialDistribution(@NonNull INDArray z, @NonNull INDArray probabilities) {
this(z, (int) probabilities.length(), probabilities);
}
@Override
public int opNum() {
return 8;
}
@Override
public String opName() {
return "distribution_binomial";
}
@Override
public boolean isExecSpecial() {
return true;
}
@Override
public String onnxName() {
throw new NoOpNameFoundException("No onnx op opName found for " + opName());
}
@Override
public String tensorflowName() {
throw new NoOpNameFoundException("No tensorflow op opName found for " + opName());
}
@Override
public List doDiff(List f1) {
return Collections.emptyList();
}
@Override
public void setZ(INDArray z){
//We want all 3 args set to z for this op
this.x = z;
this.y = z;
this.z = z;
}
}