/*
* Copyright [2013-2015] PayPal Software Foundation
*
* Licensed 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 ml.shifu.shifu.core.posttrain;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.io.Writable;
/**
* {@link Writable} implementation for bin average score. Sum and count values are included in bin list of one feature..
*
* @author Zhang David (pengzhang@paypal.com)
*/
public class FeatureStatsWritable implements Writable {
public static class BinStats {
private double binSum;
private long binCnt;
public BinStats(double binSum, long binCnt) {
this.setBinSum(binSum);
this.setBinCnt(binCnt);
}
/**
* @return the binSum
*/
public double getBinSum() {
return binSum;
}
/**
* @param binSum
* the binSum to set
*/
public void setBinSum(double binSum) {
this.binSum = binSum;
}
/**
* @return the binCnt
*/
public long getBinCnt() {
return binCnt;
}
/**
* @param binCnt
* the binCnt to set
*/
public void setBinCnt(long binCnt) {
this.binCnt = binCnt;
}
}
public FeatureStatsWritable() {
}
public FeatureStatsWritable(List<BinStats> binStats) {
this.binStats = binStats;
}
private List<BinStats> binStats;
/**
* @return the binStats
*/
public List<BinStats> getBinStats() {
return binStats;
}
/**
* @param binStats
* the binStats to set
*/
public void setBinStats(List<BinStats> binStats) {
this.binStats = binStats;
}
@Override
public void write(DataOutput out) throws IOException {
if(binStats == null) {
out.writeInt(0);
} else {
out.writeInt(binStats.size());
for(BinStats bin: binStats) {
out.writeDouble(bin.getBinSum());
out.writeLong(bin.getBinCnt());
}
}
}
@Override
public void readFields(DataInput in) throws IOException {
int len = in.readInt();
this.binStats = new ArrayList<FeatureStatsWritable.BinStats>(len);
for(int i = 0; i < len; i++) {
this.binStats.add(new BinStats(in.readDouble(), in.readLong()));
}
}
}