public static class MatrixColumnMeansJob.MatrixColumnMeansMapper extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>
Constructor and Description |
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MatrixColumnMeansMapper() |
Modifier and Type | Method and Description |
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void |
cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
The column-wise sum is written at the cleanup stage.
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void |
map(org.apache.hadoop.io.Writable r,
VectorWritable v,
org.apache.hadoop.mapreduce.Mapper.Context context)
The mapper computes a running sum of the vectors the task has seen.
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void |
setup(org.apache.hadoop.mapreduce.Mapper.Context context) |
public void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
setup
in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>
public void map(org.apache.hadoop.io.Writable r, VectorWritable v, org.apache.hadoop.mapreduce.Mapper.Context context) throws IOException
map
in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>
IOException
public void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context) throws InterruptedException, IOException
cleanup
in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>
InterruptedException
IOException
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