public static void trainModel(String filteredDataPath, String modelpath) throws IOException {
String line = "";
String combline = "";
// read and process raw data
BufferedReader br = new BufferedReader(new FileReader(filteredDataPath));
while ((line = br.readLine()) != null) combline = combline + " " + line;
List<String> words = Lists.newArrayList(combline.split(" "));
List<List<String>> localDoc = Lists.newArrayList(words, words);
// build a context object
JavaSparkContext sc = new JavaSparkContext("local", "Word2VecSuite");
JavaRDD<List<String>> doc = sc.parallelize(localDoc);
// training settings
Word2Vec word2vec = new Word2Vec().setVectorSize(100).setMinCount(50).setSeed(42L);
// train
Word2VecModel model = word2vec.fit(doc);
// save model
SparkContext sc1 = sc.toSparkContext(sc);
model.save(sc1, modelpath);
System.out.println("Model has been saved in folder: " + modelpath);
}
public static double cos50(String word, Tuple2<String, Object>[] syms, Word2VecModel model) {
double[] v1 = model.transform(word).toArray();
// Tuple2<String, Object>[] syms2 = model.findSynonyms(word, 20);
int count = 0;
double cosSum = 0;
double cosAvg = 0;
for (Tuple2<String, Object> t : syms) {
double[] v2 = model.transform(t._1).toArray();
cosSum = cosSum + cosineSimilarity(v1, v2);
// cosSum=cosSum+distance(v1, v2);
}
cosAvg = cosSum / syms.length;
return cosAvg;
}
public static List<List<String>> getSynonyms(List<String> words, String modelpath)
throws IOException {
/**
* //read term file to get the list of phrases List<String> terms = new ArrayList<>();
* logger.log(Level.INFO, "*********Reading term file...."); String combline=""; String line
* =""; try { BufferedReader br = new BufferedReader(new FileReader(termFile)); int i=0; while
* ((line=br.readLine()) != null) { String phr = line.replaceAll("[^A-Za-z]"," ").trim();
* terms.add(phr); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block
* e.printStackTrace(); }
*/
SparkContext sc = new SparkContext("local", "appName");
// load a trained model
Word2VecModel model = Word2VecModel.load(sc, modelpath);
// find similar words
List<List<String>> synsSet = new ArrayList<List<String>>();
for (String word : words) {
word = word.replaceAll("\\s", "-");
Tuple2<String, Object>[] syms1 = model.findSynonyms(word, 50);
// cos50 value of the target word
// double cos50Value = cos50(word,syms, model);
// System.out.println("CosAvg-50 value of the target word " + word +":"+cos50Value);
HashMap<String, Double> closeList = new HashMap<String, Double>();
System.out.println("The nearests of the word " + word + ":");
int count = 0;
double cos50Value1 = 0;
double cos50Value2 = 0;
List<String> syns = new ArrayList<>();
syns.add(word); // add itself
for (Tuple2<String, Object> t : syms1) {
syns.add(t._1);
/**
* String term=""; int termIndex=0; if (t._1.contains("_")){ termIndex = Integer.parseInt(
* t._1.substring(t._1.indexOf("_")+1)); if (termIndex != 0) term = terms.get(termIndex);}
*/
// cos50Value1 = cos50(word,syms1, model);
cos50Value1 =
cosineSimilarity(model.transform(word).toArray(), model.transform(t._1).toArray());
// cos50Value1=distance(model.transform(word).toArray(), model.transform(t._1).toArray());
cos50Value2 = 0;
// Tuple2<String, Object>[] syms2 = model.findSynonyms(t._1,10);
// cos50Value1 = cos50(word,syms2, model);
// cos50Value2 = cos50(t._1,syms2, model);
if (t._1.contains("/NN") || t._1.contains("/NNS")) {
// if (!word.contains(t._1) && !t._1.contains(word)) {
// if (!term.contains(word)) {
count = count + 1;
System.out.println("No " + count + ": " + t._1);
}
double dif = Math.abs(cos50Value1 - cos50Value2);
closeList.put(t._1, dif);
}
synsSet.add(syns);
/**
* //sort the list by difference System.out.println("--------------------------------------");
* System.out.println("The nearests of the word " + word +":"); Set<Entry<String, Double>> set
* = closeList.entrySet(); List<Entry<String, Double>> sortedList = new
* ArrayList<Entry<String, Double>>( set); Collections.sort(sortedList, new
* Comparator<Map.Entry<String, Double>>() { public int compare(Map.Entry<String, Double> o1,
* Map.Entry<String, Double> o2) { return o2.getValue().compareTo(o1.getValue()); } });
* count=0; for (Entry<String, Double> entry : sortedList) { count=count+1;
*
* <p>System.out.println("No " + count+ ": " +entry.getKey() + " " + entry.getValue()); }
*
* <p>//retrieve vector space scala.collection.immutable.Map<String,float[]> m =
* model.getVectors();
*
* <p>double[] v1 = model.transform(word).toArray();
*
* <p>System.out.println(Arrays.toString(v1));
*/
}
return synsSet;
}