org.apache.mahout.math.stats.entropy
Class CalculateEntropyMapper
java.lang.Object
org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,VarIntWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
org.apache.mahout.math.stats.entropy.CalculateEntropyMapper
public final class CalculateEntropyMapper
- extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,VarIntWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
Calculates the entropy for the value with H(x) = x * log(x)
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper |
org.apache.hadoop.mapreduce.Mapper.Context |
Method Summary |
protected void |
map(org.apache.hadoop.io.Text key,
VarIntWritable value,
org.apache.hadoop.mapreduce.Mapper.Context context)
|
Methods inherited from class org.apache.hadoop.mapreduce.Mapper |
cleanup, run, setup |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
CalculateEntropyMapper
public CalculateEntropyMapper()
map
protected void map(org.apache.hadoop.io.Text key,
VarIntWritable value,
org.apache.hadoop.mapreduce.Mapper.Context context)
throws IOException,
InterruptedException
- Overrides:
map
in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,VarIntWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
- Throws:
IOException
InterruptedException
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