ai.djl.modality.nlp.preprocess.PunctuationSeparator Maven / Gradle / Ivy
/*
* Copyright 2019 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.nlp.preprocess;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/** {@code PunctuationSeparator} separates punctuation into a separate token. */
public class PunctuationSeparator implements TextProcessor {
private static final Pattern PATTERN =
Pattern.compile(
"\\s+|(?<=[\\p{Punct}\\p{IsPunctuation}])|(?=[\\p{Punct}\\p{IsPunctuation}])");
/** {@inheritDoc} */
@Override
public List preprocess(List tokens) {
return tokens.stream()
.map(PATTERN::split)
.flatMap(Arrays::stream)
.filter(s -> !s.isEmpty())
.collect(Collectors.toList());
}
}