Add multiplication example of file matrices
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Key: HAMA-151
URL: https://issues.apache.org/jira/browse/HAMA-151
Project: Hama
Issue Type: New Feature
Components: documentation , examples
Affects Versions: 0.1.0
Reporter: Edward J. Yoon
Assignee: Edward J. Yoon
Fix For: 0.1.0
Using CollectBlocksMap (See also HAMA-150), We can collect the blocks to
'collectionTable' from HDFS files as describe below.
It would be nice if it added up the examples.
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public static class MyMapper extends CollectBlocksBase implements
CollectBlocksMap<IntWritable, MapWritable> {
private MapWritable value;
@Override
public void map(IntWritable key, MapWritable value,
OutputCollector<BlockID, VectorWritable> output, Reporter reporter)
throws IOException {
int startColumn;
int endColumn;
int blkRow = key.get() / mBlockRowSize;
this.value = value;
int i = 0;
do {
startColumn = i * mBlockColSize;
endColumn = startColumn + mBlockColSize - 1;
if (endColumn >= mColumns) // the last sub vector
endColumn = mColumns - 1;
output.collect(new BlockID(blkRow, i), new VectorWritable(key.get(),
subVector(startColumn, endColumn)));
i++;
} while (endColumn < (mColumns - 1));
}
private DenseVector subVector(int i0, int i1) {
DenseVector res = new DenseVector();
for (int i = i0; i <= i1; i++) {
res.set(i, ((DoubleWritable) this.value.get(new IntWritable(i))).get());
}
return res;
}
}
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