org.apache.mahout.clustering.canopy.CanopyMapper Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of mahout-mr Show documentation
Show all versions of mahout-mr Show documentation
Scalable machine learning libraries
/**
* 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.clustering.canopy;
import java.io.IOException;
import java.util.Collection;
import com.google.common.collect.Lists;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.mahout.math.VectorWritable;
@Deprecated
class CanopyMapper extends
Mapper, VectorWritable, Text, VectorWritable> {
private final Collection canopies = Lists.newArrayList();
private CanopyClusterer canopyClusterer;
private int clusterFilter;
@Override
protected void map(WritableComparable> key, VectorWritable point,
Context context) throws IOException, InterruptedException {
canopyClusterer.addPointToCanopies(point.get(), canopies);
}
@Override
protected void setup(Context context) throws IOException,
InterruptedException {
super.setup(context);
canopyClusterer = CanopyConfigKeys.configureCanopyClusterer(context.getConfiguration());
clusterFilter = Integer.parseInt(context.getConfiguration().get(
CanopyConfigKeys.CF_KEY));
}
@Override
protected void cleanup(Context context) throws IOException,
InterruptedException {
for (Canopy canopy : canopies) {
canopy.computeParameters();
if (canopy.getNumObservations() > clusterFilter) {
context.write(new Text("centroid"), new VectorWritable(canopy
.getCenter()));
}
}
super.cleanup(context);
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy