/**
* The main method.
*
* @param args[0] the libsvm-formatted term-document matrix file name
* @param args[1] the co-occurrence file name
* @param args[2] the left singular vectors file name
* @param args[3] the right singular vector file name
* @param args[4] the singular values file name
* @throws IOException Signals that an I/O exception has occurred.
*/
public static void main(String[] args) throws IOException {
if (args.length != 5) {
throw (new IllegalArgumentException(
"There were " + args.length + " arguments, instead of the expected 5."));
}
String tdMatrixFilename = args[0];
String cooccurFilename = args[1];
String leftSingularVectorsFilename = args[2];
String rightSingularVectorsFilename = args[3];
String singularValuesFilename = args[4];
VectorNode[][] mx = SparseVector.transpose(SparseVector.readSparseMatrix(tdMatrixFilename));
logger.info("Calculating co-occurrence matrix");
mx = SparseVector.matrixMultiplyWithTranspose(mx, mx);
DenseVector.writeDenseMatrix(DenseVector.convertFromSparseMatrix(mx), cooccurFilename);
SVDRec svdResult = decompose(mx);
DenseVector.writeDenseMatrix(svdResult.Ut.value, leftSingularVectorsFilename);
DenseVector.writeDenseMatrix(svdResult.Vt.value, rightSingularVectorsFilename);
DenseVector.writeDenseMatrix(new double[][] {svdResult.S}, singularValuesFilename);
}
