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/*
* Copyright 2009 David Jurgens
*
* This file is part of the S-Space package and is covered under the terms and
* conditions therein.
*
* The S-Space package is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation and distributed hereunder to you.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND NO REPRESENTATIONS OR WARRANTIES,
* EXPRESS OR IMPLIED ARE MADE. BY WAY OF EXAMPLE, BUT NOT LIMITATION, WE MAKE
* NO REPRESENTATIONS OR WARRANTIES OF MERCHANT- ABILITY OR FITNESS FOR ANY
* PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE OR DOCUMENTATION
* WILL NOT INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER
* RIGHTS.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see The {@code addColumn} method is capable of throwing an {@code IOError} if any
* {@code IOException} occurs while operating on the underlying matrix file.
*
*
This class is thread-safe.
*
* @author David Jurgens
*/
public class SvdlibcSparseBinaryMatrixBuilder implements MatrixBuilder {
/**
* Logger for the {@code SvdlibcSparseBinaryMatrixBuilder} class
*/
private static final Logger LOGGER =
Logger.getLogger(SvdlibcSparseBinaryMatrixBuilder.class.getName());
/**
* The writer used to add data to the transposed matrix file
*/
private final DataOutputStream matrixDos;
/**
* Whether the inputted matrix columns should be transposed as rows in the
* final matrix data file.
*/
private final boolean transposeData;
/**
* Whether the builder has finished adding data to the matrix array
*/
private boolean isFinished;
/**
* The number of the column that will next be assigned. Once this matrix
* has been finished, this value will reflect the total number of rows in
* the matrix.
*/
private int curCol;
/**
* The file to which the matrix will be written
*/
private File matrixFile;
/**
* The total number of columns in the matrix. This value is continuously
* updated as new columns are seen and is not valid until the matrix has been
* finished.
*/
private int numRows;
/**
* The total number of non-zero values in the matrix. This value is
* continuously updated as new columns are seen and is not valid until the
* matrix has been finished.
*/
private int nonZeroValues;
/**
* The file to which the matrix will be written if the data is to be
* transposed in its final form. The data is originally written in its
* non-transposed form to this file and then is converted when {@link
* #finish() finish} is called.
*/
private File transposedMatrixFile;
/**
* Creates a builder for a matrix in the {@link
* MatrixIO.Format#SVDLIBC_SPARSE_BINARY SVDLIBC_SPARSE_BINARY} format to be
* stored in a temporary file.
*/
public SvdlibcSparseBinaryMatrixBuilder() {
this(getTempMatrixFile(), false);
}
/**
* Creates a builder for a matrix in the {@link
* MatrixIO.Format#SVDLIBC_SPARSE_BINARY SVDLIBC_SPARSE_BINARY} format to be
* stored in a temporary file.
*
* @param transposeData {@code true} if the input matrix columns should be
* tranposed in the backing matrix file
*/
public SvdlibcSparseBinaryMatrixBuilder(boolean transposeData) {
this(getTempMatrixFile(), transposeData);
}
/**
* Creates a builder for a matrix in the {@link
* MatrixIO.Format#SVDLIBC_SPARSE_BINARY SVDLIBC_SPARSE_BINARY} format,
* which will be stored in the specified file.
*
* @param backingFile the file to which the matrix should be written
*/
public SvdlibcSparseBinaryMatrixBuilder(File backingFile) {
this(backingFile, false);
}
/**
* Creates a builder for a matrix in the {@link
* MatrixIO.Format#SVDLIBC_SPARSE_BINARY SVDLIBC_SPARSE_BINARY} format,
* which will be stored in the specified file.
*
* @param backingFile the file to which the matrix should be written
* @param transposeData {@code true} if the input matrix columns should be
* tranposed in the backing matrix file
*/
public SvdlibcSparseBinaryMatrixBuilder(File backingFile,
boolean transposeData) {
this.matrixFile = backingFile;
this.transposeData = transposeData;
curCol = 0;
numRows = 0;
nonZeroValues = 0;
isFinished = false;
try {
File matrixDataFile = (transposeData)
? (transposedMatrixFile = getTempMatrixFile())
: backingFile;
// Interact with the matrix using a RandomAccessFile
//matrixRaf = new RandomAccessFile(backingFile, "rw");
matrixDos = new DataOutputStream(
new BufferedOutputStream(new FileOutputStream(matrixDataFile)));
// write the 12 byte header to advance the file pointer to where the
// matrix data will start. The header will be back filled once the
// matrix data has been finalized
for (int i = 0; i < 3; ++i)
matrixDos.writeInt(0);
} catch (IOException ioe) {
throw new IOError(ioe);
}
}
/**
* Returns a temporary file that will be deleted on JVM exit.
*'
* @return a temporary file used to store a matrix
*/
private static File getTempMatrixFile() {
File tmp = null;
try {
tmp = File.createTempFile("svdlibc-sparse-binary-matrix", ".dat");
//tmp.deleteOnExit();
} catch (IOException ioe) {
throw new IOError(ioe);
}
return tmp;
}
/**
* {@inheritDoc}
*/
public synchronized int addColumn(double[] column) {
if (isFinished)
throw new IllegalStateException(
"Cannot add columns to a MatrixBuilder that is finished");
// Update the size of the matrix based on the size of the array
if (column.length > numRows)
numRows = column.length;
// Identify how many non-zero values are present in the column
int nonZero = 0;
for (int i = 0; i < column.length; ++i) {
if (column[i] != 0d)
nonZero++;
}
// Update the total number of non-zero values for the entire matrix
nonZeroValues += nonZero;
// Write the column to file
try {
matrixDos.writeInt(nonZero);
for (int i = 0; i < column.length; ++i) {
if (column[i] != 0d) {
matrixDos.writeInt(i); // write the row index
matrixDos.writeFloat((float)column[i]);
}
}
} catch (IOException ioe) {
throw new IOError(ioe);
}
return ++curCol;
}
/**
* {@inheritDoc}
*/
public synchronized int addColumn(SparseArray column) {
if (isFinished)
throw new IllegalStateException(
"Cannot add columns to a MatrixBuilder that is finished");
if (column.length() > numRows)
numRows = column.length();
// SparseArray instances can take on the maximum possible array size
// when the array length isn't specified. This ruins the matrix size
// specification since the matrix shouldn't actually be that big.
// However, because this is an implementation artifact, we can't check
// for it explicitly with an exception. Therefore, put in an assert to
// indicate what is likely going on if asserts are enabled for debugging
// they symptoms.
assert column.length() != Integer.MAX_VALUE : "adding a column whose " +
"length is Integer.MAX_VALUE (was likley left unspecified in the " +
" constructor).";
int[] nonZero = column.getElementIndices();
nonZeroValues += nonZero.length;
try {
matrixDos.writeInt(nonZero.length);
for (int i : nonZero) {
matrixDos.writeInt(i); // write the row index
matrixDos.writeFloat(column.get(i).floatValue());
}
} catch (IOException ioe) {
throw new IOError(ioe);
}
return ++curCol;
}
/**
* {@inheritDoc}
*/
public synchronized int addColumn(Vector col) {
if (isFinished)
throw new IllegalStateException(
"Cannot add columns to a MatrixBuilder that is finished");
DoubleVector column = Vectors.asDouble(col);
if (column.length() > numRows)
numRows = column.length();
// Vector instances can take on the maximum possible array size when the
// vector length isn't specified. This ruins the matrix size
// specification since the matrix shouldn't actually be that big.
// However, because this is an implementation artifact, we can't check
// for it explicitly with an exception. Therefore, put in an assert to
// indicate what is likely going on if asserts are enabled for debugging
// they symptoms.
assert column.length() != Integer.MAX_VALUE : "adding a column whose " +
"length is Integer.MAX_VALUE (was likley left unspecified in the " +
" constructor).";
// Special case for sparse Vectors, for which we already know the
// non-zero indices for the column
if (column instanceof SparseVector) {
SparseVector s = (SparseVector)column;
int[] nonZero = s.getNonZeroIndices();
nonZeroValues += nonZero.length;
System.out.println(nonZero.length);
try {
matrixDos.writeInt(nonZero.length);
for (int i : nonZero) {
double val = column.get(i);
matrixDos.writeInt(i); // write the row index
matrixDos.writeFloat((float)val);
}
} catch (IOException ioe) {
throw new IOError(ioe);
}
}
// For dense Vectors, find which values are non-zero and write only
// those
else {
int nonZero = 0;
for (int i = 0; i < column.length(); ++i) {
double d = column.get(i);
if (d != 0d)
nonZero++;
}
// Update the matrix count
nonZeroValues += nonZero;
try {
matrixDos.writeInt(nonZero);
// Write the number of non-zero values in the column
for (int i = 0; i < column.length(); ++i) {
double value = column.get(i);
if (value != 0d) {
matrixDos.writeInt(i); // write the row index
matrixDos.writeFloat((float)value);
}
}
} catch (IOException ioe) {
throw new IOError(ioe);
}
}
return ++curCol;
}
/**
* {@inheritDoc} Once this method has been called, any subsequent calls will
* have no effect and will not throw an exception.
*/
public synchronized void finish() {
if (!isFinished) {
isFinished = true;
try {
matrixDos.close();
// Re-open as a random access file so we can overwrite the 3 int
// header that specifies the number of dimensions and values.
// Note that the location of the matrix data is dependent on
// whether the matrix is to be transposed.
File dataFile = (transposeData)
? transposedMatrixFile
: matrixFile;
RandomAccessFile matrixRaf =
new RandomAccessFile(dataFile, "rw");
// Back fill the dimensions of the matrix and the number of
// non-zero values as the 3 int header in the file
matrixRaf.writeInt(numRows);
matrixRaf.writeInt(curCol);
matrixRaf.writeInt(nonZeroValues);
matrixRaf.close();
} catch (IOException ioe) {
throw new IOError(ioe);
}
// If the user specified that the matrix should be tranposed, then
// transposedMatrixFile will contain the matrix in its un-transposed
// form. Issue a call to SVDLIBC to transposed the file contents
// for us.
if (transposeData) {
boolean svdlibcFailed = false;
try {
String commandLine = "svd -r sb " + " -w sb -t -c "
+ transposedMatrixFile + " " + matrixFile;
Process svdlibc = Runtime.getRuntime().exec(commandLine);
LOGGER.fine("transposing svdlibc sparse matrix: " + commandLine);
BufferedReader stdout = new BufferedReader(
new InputStreamReader(svdlibc.getInputStream()));
BufferedReader stderr = new BufferedReader(
new InputStreamReader(svdlibc.getErrorStream()));
StringBuilder output = new StringBuilder("SVDLIBC output:\n");
for (String line = null; (line = stderr.readLine()) != null; ) {
output.append(line).append("\n");
}
LOGGER.fine(output.toString());
int exitStatus = svdlibc.waitFor();
LOGGER.fine("svdlibc exit status: " + exitStatus);
if (exitStatus != 0) {
StringBuilder sb = new StringBuilder();
for (String line = null; (line = stderr.readLine()) != null; ) {
sb.append(line).append("\n");
}
// warning or error?
LOGGER.warning("svdlibc exited with error status. " +
"stderr:\n" + sb.toString());
svdlibcFailed = true;
}
}
catch (Exception e) {
svdlibcFailed = true;
LOGGER.log(Level.WARNING,
"an exception occurred when trying to transpose " +
"with svdlibc; retrying with Java code", e);
}
// If SVDLIBC failed in any way, use MatrixIO to transpose the
// data for us.
if (svdlibcFailed) {
LOGGER.fine("retrying failed svdlibc transpose " +
"with MatrixIO transpose");
try {
matrixFile = MatrixIO.convertFormat(
transposedMatrixFile, Format.SVDLIBC_SPARSE_BINARY,
Format.SVDLIBC_SPARSE_BINARY, true);
} catch (IOException ioe) {
throw new IOError(ioe);
}
}
}
}
}
/**
* {@inheritDoc}
*/
public synchronized File getFile() {
if (!isFinished)
throw new IllegalStateException(
"Cannot access matrix file until finished has been called");
return matrixFile;
}
/**
* Returns {@link MatrixIO.Format#SVDLIBC_SPARSE_BINARY
* SVDLIBC_SPARSE_BINARY}.
*/
public Format getMatrixFormat() {
return MatrixIO.Format.SVDLIBC_SPARSE_BINARY;
}
/**
* {@inheritDoc}
*/
public MatrixFile getMatrixFile() {
return new MatrixFile(getFile(), getMatrixFormat());
}
/**
* {@inheritDoc}
*/
public synchronized boolean isFinished() {
return isFinished;
}
}