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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.reduce3;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.BaseReduceFloatOp;
import org.nd4j.linalg.api.ops.executioner.OpExecutioner;
import org.nd4j.linalg.factory.Nd4j;
import java.util.Arrays;
import java.util.List;
/**
* Cosine distance
* Note that you need to initialize
* a scaling constant equal to the norm2 of the
* vector
*
* @author [email protected]
*/
public class CosineDistance extends BaseReduce3Op {
public CosineDistance(SameDiff sameDiff, SDVariable i_v, SDVariable i_v2, int... dimensions) {
super(sameDiff, i_v, i_v2, dimensions);
}
public CosineDistance() {
}
public CosineDistance(INDArray x, INDArray y, INDArray z) {
this(x, y, z, null);
}
public CosineDistance(INDArray x, INDArray y, INDArray z, int... dimension) {
super(x, y, z, dimension);
extraArgs = new Object[]{0.0f, 0.0f};
}
public CosineDistance(INDArray x, INDArray y, int... dimension) {
this(x, y, null, dimension);
}
public CosineDistance(INDArray x, INDArray y, INDArray z, boolean allDistances, int... dimension) {
this(x, y, z, dimension);
this.isComplex = allDistances;
}
public CosineDistance(INDArray x, INDArray y, boolean allDistances, int... dimension) {
this(x, y, null, allDistances, dimension);
}
public CosineDistance(INDArray x, INDArray y, INDArray z, boolean keepDims, boolean allDistances, int... dimensions){
super(x, y, z, keepDims, allDistances, dimensions);
extraArgs = new Object[]{0.0f, 0.0f};
}
@Override
public int opNum() {
return 5;
}
@Override
public String opName() {
return "cosinedistance";
}
@Override
public List doDiff(List i_v1) {
//Cosine distance = 1 - cosine similarity
//Therefore: just need to negate gradients from cosine similarity...
List diff = CosineSimilarity.doDiff(sameDiff, f(), larg(), rarg(), i_v1.get(0), keepDims, dimensions);
return Arrays.asList(f().neg(diff.get(0)), f().neg(diff.get(1)));
}
@Override
public String tensorflowName() {
return "cosine_distance";
}
}