/* (non-Javadoc)
* @see lexelt.ILexeltWriter#getInstances(lexelt.ILexelt)
*/
public Object getInstances(ILexelt p_Lexelt) throws ClassNotFoundException {
svm_problem retVal = new svm_problem();
ArrayList<svm_node[]> featureVectors = new ArrayList<svm_node[]>();
ArrayList<Double> classes = new ArrayList<Double>();
int[][] indice = this.loadStatistic(p_Lexelt);
if (indice == null) {
throw new IllegalArgumentException("the input lexelt should not be null.");
}
IStatistic stat = p_Lexelt.getStatistic();
int size = p_Lexelt.size(); // instance count
for (int i = 0; i < size; i++) {
IInstance instance = p_Lexelt.getInstance(i);
svm_node[] featureVector = this.getVector(instance, stat, indice);
ArrayList<String> tags = instance.getTag();
if (tags.size() > 0) {
for (String tag : tags) {
double c = Double.parseDouble(tag);
featureVectors.add(Arrays.copyOf(featureVector, featureVector.length));
classes.add(c);
}
} else {
featureVectors.add(featureVector);
classes.add(new Double(0));
}
}
retVal.l = featureVectors.size();
retVal.x = new svm_node[retVal.l][];
retVal.y = new double[retVal.l];
for (int i = 0; i < featureVectors.size(); i++) {
retVal.x[i] = featureVectors.get(i);
retVal.y[i] = classes.get(i);
}
return retVal;
}
/**
* @param p_Instance
* @param p_Stat
* @return
*/
private String toString(IInstance p_Instance, IStatistic p_Stat, int[][] p_Indice) {
StringBuilder featureBuilder = new StringBuilder();
svm_node[] features = this.getVector(p_Instance, p_Stat, p_Indice);
for (int i = 0; i < features.length; i++) {
featureBuilder.append(" ");
featureBuilder.append(features[i].index);
featureBuilder.append(":");
featureBuilder.append(features[i].value);
}
String featureOnly = featureBuilder.toString();
StringBuilder builder = new StringBuilder();
for (Integer tag : this.processTags(p_Stat, p_Instance.getTag())) {
builder.append(tag.toString());
builder.append(featureOnly);
builder.append("\n");
}
return builder.toString();
}