| /* |
| * 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.util; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** Represents a weighted sequence of outcomes. */ |
| public class Sequence implements Comparable<Sequence> { |
| private double score; |
| private List<String> outcomes; |
| private List<Double> probs; |
| private static final Double ONE = 1.0d; |
| |
| /** Creates a new sequence of outcomes. */ |
| public Sequence() { |
| outcomes = new ArrayList<>(1); |
| probs = new ArrayList<>(1); |
| score = 0d; |
| } |
| |
| public Sequence(Sequence s) { |
| outcomes = new ArrayList<>(s.outcomes.size() + 1); |
| outcomes.addAll(s.outcomes); |
| probs = new ArrayList<>(s.probs.size() + 1); |
| probs.addAll(s.probs); |
| score = s.score; |
| } |
| |
| public Sequence(Sequence s,String outcome, double p) { |
| outcomes = new ArrayList<>(s.outcomes.size() + 1); |
| outcomes.addAll(s.outcomes); |
| outcomes.add(outcome); |
| probs = new ArrayList<>(s.probs.size() + 1); |
| probs.addAll(s.probs); |
| probs.add(p); |
| score = s.score + StrictMath.log(p); |
| } |
| |
| public Sequence(List<String> outcomes) { |
| this.outcomes = outcomes; |
| this.probs = Collections.nCopies(outcomes.size(),ONE); |
| } |
| |
| public int compareTo(Sequence s) { |
| return Double.compare(s.score, score); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(outcomes, probs, score); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| |
| if (obj instanceof Sequence) { |
| Sequence other = (Sequence) obj; |
| double epsilon = 0.0000001; |
| return Objects.equals(outcomes, other.outcomes) && |
| Objects.equals(probs, other.probs) && |
| StrictMath.abs(score - other.score) < epsilon; |
| } |
| |
| return false; |
| } |
| |
| /** Adds an outcome and probability to this sequence. |
| * @param outcome the outcome to be added. |
| * @param p the probability associated with this outcome. |
| */ |
| public void add(String outcome, double p) { |
| outcomes.add(outcome); |
| probs.add(p); |
| score += StrictMath.log(p); |
| } |
| |
| /** Returns a list of outcomes for this sequence. |
| * @return a list of outcomes. |
| */ |
| public List<String> getOutcomes() { |
| return outcomes; |
| } |
| |
| /** Returns an array of probabilities associated with the outcomes of this sequence. |
| * @return an array of probabilities. |
| */ |
| public double[] getProbs() { |
| double[] ps = new double[probs.size()]; |
| getProbs(ps); |
| return ps; |
| } |
| |
| /** |
| * Returns the score of this sequence. |
| * @return The score of this sequence. |
| */ |
| public double getScore() { |
| return score; |
| } |
| |
| /** Populates an array with the probabilities associated with the outcomes of this sequence. |
| * @param ps a pre-allocated array to use to hold the values of the |
| * probabilities of the outcomes for this sequence. |
| */ |
| public void getProbs(double[] ps) { |
| for (int pi = 0, pl = probs.size(); pi < pl; pi++) { |
| ps[pi] = probs.get(pi); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return score + " " + outcomes; |
| } |
| } |