Examples of org.apache.mahout.math.hadoop.stochasticsvd.DenseBlockWritable

org.apache.mahout.math.hadoop.stochasticsvd.DenseBlockWritable

Ad-hoc substitution for {@link org.apache.mahout.math.MatrixWritable}. Perhaps more useful for situations with mostly dense data (such as Q-blocks) but reduces GC by reusing the same block memory between loads and writes.

in case of Q blocks, it doesn't even matter if they this data is dense cause we need to unpack it into dense for fast access in computations anyway and even if it is not so dense the block compressor in sequence files will take care of it for the serialized size.

  private boolean loadNextQt() {
    boolean more = qHatInput.hasNext();
    if (!more) {
      return false;
    }
    DenseBlockWritable v = qHatInput.next();
    mQt =
      GivensThinSolver
        .computeQtHat(v.getBlock(),
                      blockNum == 0 ? 0 : 1,
                      new CopyConstructorIterator<UpperTriangular>(mRs
                        .iterator()));
    r = mQt[0].length;
    kp = mQt.length;

  private boolean loadNextQt() {
    boolean more = qHatInput.hasNext();
    if (!more) {
      return false;
    }
    DenseBlockWritable v = qHatInput.next();
    mQt =
      GivensThinSolver
        .computeQtHat(v.getBlock(),
                      blockNum == 0 ? 0 : 1,
                      new CopyConstructorIterator<UpperTriangular>(mRs
                        .iterator()));
    r = mQt[0].length;
    kp = mQt.length;

  private boolean loadNextQt() {
    boolean more = qHatInput.hasNext();
    if (!more) {
      return false;
    }
    DenseBlockWritable v = qHatInput.next();
    mQt =
      GivensThinSolver
        .computeQtHat(v.getBlock(),
                      blockNum == 0 ? 0 : 1,
                      new CopyConstructorIterator<UpperTriangular>(mRs
                        .iterator()));
    r = mQt[0].length;
    kp = mQt.length;

Examples of org.apache.mahout.math.hadoop.stochasticsvd.DenseBlockWritable

Related Classes of org.apache.mahout.math.hadoop.stochasticsvd.DenseBlockWritable