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准备Mahout所用的向量ApplesToVectors

IT知识vectorvectors

弱龄寄事外，委怀在琴书。这篇文章主要讲述准备Mahout所用的向量ApplesToVectors相关的知识，希望能为你提供帮助。

< strong> < span style=" font-size:18px; " > /*** * @author YangXin * @info 准备Mahout所用的向量 * 将苹果的信息转化为输入的向量 */ package unitEight; import java.util.ArrayList; import java.util.List; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.SequenceFile; import org.apache.hadoop.io.Text; import org.apache.mahout.math.DenseVector; import org.apache.mahout.math.NamedVector; import org.apache.mahout.math.VectorWritable; /** * 我们能够使用向量的名字或描写叙述为键，此处为NameVector,而向量本身作为值。
* Mahout的Vector类没有实现Writable接口。以避免他们和Hadoop直接耦合。
* 但能够用VectorWritable类来封装一个Vector并使之为Writable。
【准备Mahout所用的向量ApplesToVectors】 * 即Mahout中的向量能够使用VectorWritable类写入SequenceFile。
*/ public class ApplesToVectors { public static void main(String[] args) throws Exception{ List< NamedVector> apples = new ArrayList< NamedVector> (); NamedVector apple; apple = new NamedVector(new DenseVector(new double[]{0.11, 510, 1}), " Small round green apple" ); apples.add(apple); apple = new NamedVector(new DenseVector(new double[]{0.23, 650, 3}), " Large oval red apple" ); apples.add(apple); apple = new NamedVector(new DenseVector(new double[]{0.09, 630, 1}), " Small elongated red apple" ); apples.add(apple); apple = new NamedVector(new DenseVector(new double[]{0.25, 590, 3}), " Large round yellow apple" ); apples.add(apple); apple = new NamedVector(new DenseVector(new double[]{0.18, 520, 2}), " Medium oval green apple" ); Configuration conf = new Configuration(); FileSystem fs = FileSystem.get(conf); Path path = new Path(" E:\\apples.txt" ); SequenceFile.Writer writer = new SequenceFile.Writer(fs, conf, path, Text.class, VectorWritable.class); VectorWritable vec = new VectorWritable(); for(NamedVector vector:apples){ vec.set(vector); writer.append(new Text(vector.getName()), vec); } writer.close(); SequenceFile.Reader reader = new SequenceFile.Reader(fs, new Path(" E:\\apples.txt" ), conf); Text key = new Text(); VectorWritable value = https://www.songbingjia.com/android/new VectorWritable(); while(reader.next(key, value)){ System.out.println(key.toString() + " " + value.get().asFormatString()); ; } reader.close(); } } < /span> < /strong>





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