ai.djl.modality.cv.transform.RandomFlipTopBottom Maven / Gradle / Ivy
/*
* Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
* with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file 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.
*/
package ai.djl.modality.cv.transform;
import ai.djl.ndarray.NDArray;
import ai.djl.translate.Transform;
import ai.djl.util.RandomUtils;
import java.util.Random;
/**
* A {@link Transform} that randomly flip the input image top to bottom with a probability of 0.5.
*/
public class RandomFlipTopBottom implements Transform {
Integer seed;
/** Creates a new instance of {@code RandomFlipTopBottom}. */
public RandomFlipTopBottom() {}
/**
* Creates a new instance of {@code RandomFlipTopBottom} with the given seed.
*
* @param seed the value of the seed
*/
public RandomFlipTopBottom(int seed) {
this.seed = seed;
}
/** {@inheritDoc} */
@Override
public NDArray transform(NDArray array) {
Random rnd = (seed != null) ? new Random(seed) : RandomUtils.RANDOM;
if (rnd.nextFloat() > 0.5) {
array.flip(0);
}
return array;
}
}