org.apache.sysml.runtime.matrix.data

Interface MatrixBlockDataInput



  • public interface MatrixBlockDataInput
    Any data input that is intended to support fast deserialization / read of entire blocks should implement this interface. On read of a matrix block we check if the input stream is an implementation of this interface, if yes we let the implementation directly pass the entire block instead of value-by-value. Known implementation classes: - FastBufferedDataInputStream - CacheDataInput
    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method and Description
      long readDoubleArray(int len, double[] varr)
      Reads the double array from the data input into the given dense block and returns the number of non-zeros.
      long readSparseRows(int rlen, long nnz, SparseBlock rows)
      Reads the sparse rows array from the data input into a sparse block and returns the number of non-zeros.
    • Method Detail

      • readDoubleArray

        long readDoubleArray(int len,
                             double[] varr)
                      throws IOException
        Reads the double array from the data input into the given dense block and returns the number of non-zeros.
        Parameters:
        len - ?
        varr - ?
        Returns:
        number of non-zeros
        Throws:
        IOException - if IOException occurs
      • readSparseRows

        long readSparseRows(int rlen,
                            long nnz,
                            SparseBlock rows)
                     throws IOException
        Reads the sparse rows array from the data input into a sparse block and returns the number of non-zeros.
        Parameters:
        rlen - number of rows
        nnz - number of non-zeros
        rows - sparse block
        Returns:
        number of non-zeros
        Throws:
        IOException - if IOExcepton occurs

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