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/*
* 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.nlp;
/**
* {@code Vocabulary} is a collection of tokens. The primary purpose of a vocabulary is the map a
* token to an index.
*/
public interface Vocabulary {
/**
* Returns the token corresponding to the given index.
*
* @param index the index
* @return the token corresponding to the given index
*/
String getToken(long index);
/**
* Check if the vocabulary contains a token.
*
* @param token String token to be checked
* @return whether this vocabulary contains the token
*/
boolean contains(String token);
/**
* Returns the index of the given token.
*
* @param token the token
* @return the index of the given token.
*/
long getIndex(String token);
/**
* Returns the size of the {@link Vocabulary}.
*
* @return the size of the {@link Vocabulary}
*/
long size();
}