org.deeplearning4j.iterator.bert.BertSequenceMasker Maven / Gradle / Ivy

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 * Copyright (c) 2015-2019 Skymind, Inc.
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 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
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package org.deeplearning4j.iterator.bert;

import org.nd4j.common.primitives.Pair;

import java.util.List;

/**
 * Interface used to customize how masking should be performed with {@link org.deeplearning4j.iterator.BertIterator}
 * when doing unsupervised training
 *
 * @author Alex Black
 */
public interface BertSequenceMasker {

    /**
     *
     * @param input         Input sequence of tokens
     * @param maskToken     Token to use for masking - usually something like "[MASK]"
     * @param vocabWords    Vocabulary, as a list
     * @return Pair: The new input tokens (after masking out), along with a boolean[] for whether the token is
     * masked or not (same length as number of tokens). boolean[i] is true if token i was masked.
     */
    Pair,boolean[]> maskSequence(List input, String maskToken, List vocabWords);

}