org.datavec.local.transforms.misc.NDArrayToWritablesFunction 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.misc;
import lombok.AllArgsConstructor;
import org.datavec.api.writable.DoubleWritable;
import org.datavec.api.writable.NDArrayWritable;
import org.datavec.api.writable.Writable;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.function.Function;
import java.util.ArrayList;
import java.util.List;
/**
* Function for converting NDArrays to lists of writables.
*
* @author [email protected]
*/
@AllArgsConstructor
public class NDArrayToWritablesFunction implements Function> {
private boolean useNdarrayWritable = false;
public NDArrayToWritablesFunction() {
useNdarrayWritable = false;
}
@Override
public List apply(INDArray arr) {
if (arr.rows() != 1)
throw new UnsupportedOperationException("Only NDArray row vectors can be converted to list"
+ " of Writables (found " + arr.rows() + " rows)");
List record = new ArrayList<>();
if (useNdarrayWritable) {
record.add(new NDArrayWritable(arr));
} else {
for (int i = 0; i < arr.columns(); i++)
record.add(new DoubleWritable(arr.getDouble(i)));
}
return record;
}
}