org.nd4j.linalg.api.ops.impl.shape.bp.TileBp Maven / Gradle / Ivy
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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.
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* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.linalg.api.ops.impl.shape.bp;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import java.util.*;
/**
* Tile backprop function
*
* @author Alex Black
*/
public class TileBp extends DynamicCustomOp {
private int[] repeat;
public TileBp(SameDiff sameDiff, SDVariable in, SDVariable grad, int[] repeat) {
super(null,sameDiff, new SDVariable[]{in, grad}, false);
this.repeat = repeat;
addArguments();
}
public TileBp(SameDiff sameDiff, SDVariable in, SDVariable repeat, SDVariable grad) {
super(null,sameDiff, new SDVariable[]{in, repeat, grad}, false);
this.repeat = null;
}
public TileBp() {}
private void addArguments() {
addIArgument(repeat);
}
@Override
public String opName() {
return "tile_bp";
}
@Override
public List doDiff(List i_v) {
throw new UnsupportedOperationException("Backprop of gradient op not supported");
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes.size() == 2 || (repeat == null && dataTypes.size() == 3) , "Expected list with exactly 2 datatypes for %s, got %s", getClass(), dataTypes);
//Output type is same as (original) input type
return Collections.singletonList(arg().dataType());
}
}