org.nd4j.linalg.api.ops.impl.transforms.custom.segment.SegmentSum 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.impl.transforms.custom.segment;
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.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Segment sum operation
*
* @author Alex Black
*/
public class SegmentSum extends DynamicCustomOp {
public SegmentSum(SameDiff sameDiff, SDVariable data, SDVariable segmentIds) {
super(null, sameDiff, new SDVariable[] {data, segmentIds}, false);
}
public SegmentSum(){ }
@Override
public String opName(){
return "segment_sum";
}
@Override
public String tensorflowName() {
return "SegmentSum";
}
@Override
public List doDiff(List gradients){
return Arrays.asList(f().segmentSumBp(arg(0), arg(1), gradients.get(0)));
}
@Override
public List calculateOutputDataTypes(List inputDataTypes){
Preconditions.checkState(inputDataTypes != null && inputDataTypes.size() == 2, "Expected exactly 2 input datatypes for %s, got %s", getClass(), inputDataTypes);
Preconditions.checkState(inputDataTypes.get(1).isIntType(), "Datatype for input 1 (Segment IDs) must be an integer type, got %s", inputDataTypes.get(1));
return Collections.singletonList(inputDataTypes.get(0));
}
}