org.datavec.local.transforms.sequence.LocalMapToPairByColumnFunction 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.datavec.local.transforms.sequence;
import lombok.AllArgsConstructor;
import org.datavec.api.writable.Writable;
import org.nd4j.linalg.function.Function;
import org.nd4j.linalg.primitives.Pair;
import java.util.List;
/**
* Function to map a n example to a pair, by using one of the columns as the key.
*
* @author Alex Black
*/
@AllArgsConstructor
public class LocalMapToPairByColumnFunction implements Function, Pair>> {
private final int keyColumnIdx;
@Override
public Pair> apply(List writables) {
return Pair.of(writables.get(keyColumnIdx), writables);
}
}