/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mahout.cf.taste.hadoop.slopeone;
import java.io.IOException;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.mahout.cf.taste.hadoop.EntityEntityWritable;
import org.apache.mahout.cf.taste.impl.common.FullRunningAverageAndStdDev;
@Deprecated
final class SlopeOneDiffsToAveragesReducer extends
Reducer<EntityEntityWritable,FloatWritable,EntityEntityWritable,FullRunningAverageAndStdDevWritable> {
@Override
protected void reduce(EntityEntityWritable key,
Iterable<FloatWritable> values,
Context context) throws IOException, InterruptedException {
FullRunningAverageAndStdDev average = new FullRunningAverageAndStdDev();
for (FloatWritable value : values) {
average.addDatum(value.get());
}
context.write(key, new FullRunningAverageAndStdDevWritable(average));
}
}