/*
 *  ******************************************************************************
 *  *
 *  *
 *  * 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.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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
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 */
package org.nd4j.linalg.api.ops.impl.transforms.pairwise.arithmetic.bp;

import lombok.NoArgsConstructor;
import lombok.NonNull;
import org.apache.commons.lang3.ArrayUtils;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ops.DynamicCustomOp;

import java.util.ArrayList;
import java.util.List;

@NoArgsConstructor
public class MergeAddBp extends DynamicCustomOp {

    public MergeAddBp(SameDiff sameDiff, @NonNull SDVariable[] inputs, @NonNull SDVariable gradO) {
        super("mergeadd_bp", sameDiff, ArrayUtils.add(inputs, gradO));
    }

    @Override
    public String opName() {
        return "mergeadd_bp";
    }

    @Override
    public List<DataType> calculateOutputDataTypes(List<DataType> inputDataTypes) {
        ArrayList<DataType> list = new ArrayList<>();
        for (int i=0; i< args().length-1;i++){list.add(inputDataTypes.get(0));}
        return list;

    }

    @Override
    public int getNumOutputs(){
        return args().length - 1;
    }
}
