| /* |
| * 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 org.apache.opennlp.ml.model; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.opennlp.ml.maxent.GIS; |
| import org.apache.opennlp.ml.maxent.io.SuffixSensitiveGISModelWriter; |
| |
| public class RealValueFileEventStream extends FileEventStream { |
| |
| public RealValueFileEventStream(String fileName) throws IOException { |
| super(fileName); |
| } |
| |
| public RealValueFileEventStream(File file) throws IOException { |
| super(file); |
| } |
| |
| /** |
| * Parses the specified contexts and re-populates context array with features and returns the values |
| * for these features. |
| * If all values are unspecified, then null is returned. |
| * @param contexts The contexts with real values specified. |
| * @return The value for each context or null if all values are unspecified. |
| */ |
| public static float[] parseContexts(String[] contexts) { |
| boolean hasRealValue = false; |
| float[] values = new float[contexts.length]; |
| for (int ci = 0; ci < contexts.length; ci++) { |
| int ei = contexts[ci].lastIndexOf("="); |
| if (ei > 0 && ei+1 < contexts[ci].length()) { |
| boolean gotReal = true; |
| try { |
| values[ci] = Float.parseFloat(contexts[ci].substring(ei+1)); |
| } |
| catch (NumberFormatException e) { |
| gotReal = false; |
| System.err.println("Unable to determine value in context:"+contexts[ci]); |
| values[ci] = 1; |
| } |
| if (gotReal) { |
| if (values[ci] < 0) { |
| throw new RuntimeException("Negitive values are not allowed: "+contexts[ci]); |
| } |
| contexts[ci] = contexts[ci].substring(0,ei); |
| hasRealValue = true; |
| } |
| } |
| else { |
| values[ci] = 1; |
| } |
| } |
| if (!hasRealValue) { |
| values = null; |
| } |
| return values; |
| } |
| |
| public Event next() { |
| int si = line.indexOf(' '); |
| String outcome = line.substring(0,si); |
| String[] contexts = line.substring(si+1).split(" "); |
| float[] values = parseContexts(contexts); |
| return (new Event(outcome, contexts, values)); |
| } |
| |
| /** |
| * Trains and writes a model based on the events in the specified event file. |
| * the name of the model created is based on the event file name. |
| * @param args eventfile [iterations cuttoff] |
| * @throws IOException when the eventfile can not be read or the model file can not be written. |
| */ |
| public static void main(String[] args) throws IOException { |
| if (args.length == 0) { |
| System.err.println("Usage: RealValueFileEventStream eventfile [iterations cutoff]"); |
| System.exit(1); |
| } |
| int ai=0; |
| String eventFile = args[ai++]; |
| EventStream es = new RealValueFileEventStream(eventFile); |
| int iterations = 100; |
| int cutoff = 5; |
| if (ai < args.length) { |
| iterations = Integer.parseInt(args[ai++]); |
| cutoff = Integer.parseInt(args[ai++]); |
| } |
| AbstractModel model = GIS.trainModel(iterations,new OnePassRealValueDataIndexer(es,cutoff)); |
| new SuffixSensitiveGISModelWriter(model, new File(eventFile+".bin.gz")).persist(); |
| } |
| } |