ai.djl.translate.BasicTranslator Maven / Gradle / Ivy
The newest version!
/*
* Copyright 2022 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.translate;
import ai.djl.ndarray.NDList;
/**
* A {@link Translator} made by combining a {@link PreProcessor} and a {@link PostProcessor}.
*
* @param the input class
* @param the output class
*/
public class BasicTranslator implements Translator {
private PreProcessor preProcessor;
private PostProcessor postProcessor;
private Batchifier batchifier;
/**
* Constructs a {@link BasicTranslator} with the default {@link Batchifier}.
*
* @param preProcessor the preProcessor to use for pre-processing
* @param postProcessor the postProcessor to use for post-processing
*/
public BasicTranslator(PreProcessor preProcessor, PostProcessor postProcessor) {
this.preProcessor = preProcessor;
this.postProcessor = postProcessor;
}
/**
* Constructs a {@link BasicTranslator}.
*
* @param preProcessor the preProcessor to use for pre-processing
* @param postProcessor the postProcessor to use for post-processing
* @param batchifier the batchifier to use
*/
public BasicTranslator(
PreProcessor preProcessor, PostProcessor postProcessor, Batchifier batchifier) {
this.preProcessor = preProcessor;
this.postProcessor = postProcessor;
this.batchifier = batchifier;
}
/** {@inheritDoc} */
@Override
public O processOutput(TranslatorContext ctx, NDList list) throws Exception {
return postProcessor.processOutput(ctx, list);
}
/** {@inheritDoc} */
@Override
public NDList processInput(TranslatorContext ctx, I input) throws Exception {
return preProcessor.processInput(ctx, input);
}
/** {@inheritDoc} */
@Override
public Batchifier getBatchifier() {
if (batchifier != null) {
return batchifier;
}
return Translator.super.getBatchifier();
}
/** {@inheritDoc} */
@Override
public void prepare(TranslatorContext ctx) throws Exception {
if (preProcessor instanceof Translator) {
((Translator) preProcessor).prepare(ctx);
}
if (postProcessor instanceof Translator && postProcessor != preProcessor) {
((Translator) postProcessor).prepare(ctx);
}
}
}