/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 opennlp.tools.languagemodel;
import opennlp.tools.util.StringList;
/**
* A language model can calculate the probability <i>p</i> (between 0 and 1) of a
* certain {@link opennlp.tools.util.StringList sequence of tokens}, given its underlying vocabulary.
*/
public interface LanguageModel {
/**
* Calculate the probability of a series of tokens (e.g. a sentence), given a vocabulary
*
* @param tokens the text tokens to calculate the probability for
* @return the probability of the given text tokens in the vocabulary
*/
double calculateProbability(StringList tokens);
/**
* Predict the most probable output sequence of tokens, given an input sequence of tokens
*
* @param tokens a sequence of tokens
* @return the most probable subsequent token sequence
*/
StringList predictNextTokens(StringList tokens);
}