/*
* 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;
/**
* <h1>Input</h1>
*
* <p>
* Intended for use with {@link org.apache.hadoop.mapreduce.lib.input.TextInputFormat};
* accepts line number / line pairs as
* {@link org.apache.hadoop.io.LongWritable}/{@link org.apache.hadoop.io.Text} pairs.
* </p>
*
* <p>
* Each line is assumed to be of the form {@code userID,itemID,preference}, or {@code userID,itemID}.
* </p>
*
* <h1>Output</h1>
*
* <p>
* Outputs the user ID as a {@link org.apache.mahout.math.VarLongWritable} mapped to the item ID and preference as a
* {@link EntityPrefWritable}.
* </p>
*/
public final class ToItemPrefsMapper extends ToEntityPrefsMapper {
public ToItemPrefsMapper() {
super(false);
}
}