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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.api.ops.impl.accum.distances;
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.BaseAccumulation;
import org.nd4j.linalg.api.ops.executioner.OpExecutioner;
import org.nd4j.linalg.factory.Nd4j;
import java.util.Arrays;
import java.util.List;
/**
* Hamming distance (simple)
*
* @author [email protected]
*/
public class HammingDistance extends BaseAccumulation {
public HammingDistance(SameDiff sameDiff, SDVariable i_v, SDVariable i_v2, int... dimensions) {
super(sameDiff, i_v, i_v2, dimensions);
}
public HammingDistance() {
passThrough = true;
}
public HammingDistance(INDArray x, INDArray y, INDArray z, long n) {
super(x, y, z, n);
passThrough = Nd4j.getExecutioner().executionMode() == OpExecutioner.ExecutionMode.JAVA;
extraArgs = new Object[]{0.0f, 0.0f};
}
public HammingDistance(INDArray x, INDArray y, long n) {
super(x, y, n);
passThrough = Nd4j.getExecutioner().executionMode() == OpExecutioner.ExecutionMode.JAVA;
extraArgs = new Object[]{0.0f, 0.0f};
}
public HammingDistance(INDArray x) {
super(x);
passThrough = Nd4j.getExecutioner().executionMode() == OpExecutioner.ExecutionMode.JAVA;
extraArgs = new Object[]{0.0f, 0.0f};
}
public HammingDistance(INDArray x, INDArray y) {
super(x, y);
passThrough = Nd4j.getExecutioner().executionMode() == OpExecutioner.ExecutionMode.JAVA;
extraArgs = new Object[]{0.0f, 0.0f};
}
public HammingDistance(INDArray x, INDArray y, INDArray z, boolean allDistances) {
this(x, y, z, x.lengthLong());
this.isComplex = allDistances;
}
public HammingDistance(INDArray x, INDArray y, boolean allDistances) {
this(x, y);
this.isComplex = allDistances;
}
public HammingDistance(INDArray x, INDArray y, INDArray z, boolean newFormat, boolean keepDims, int... dimensions){
super(x, y, z, newFormat, keepDims, dimensions);
extraArgs = new Object[]{0.0f, 0.0f};
}
@Override
public Type opType() {
return Type.REDUCE3;
}
@Override
public Type getOpType() {
return opType();
}
@Override
public int opNum() {
return 7;
}
@Override
public String opName() {
return "hammingdistance";
}
@Override
public List doDiff(List f1) {
//Hamming distance: "the Hamming distance between two strings of equal length is the number of positions at
// which the corresponding symbols are different."
//Consequently: it's not continuously differentiable, and gradients are 0 almost everywhere (but undefined
// when x_i == y_i)
return Arrays.asList(sameDiff.zerosLike(larg()), sameDiff.zerosLike(rarg()));
}
@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());
}
}