小编car*_*uso的帖子

我正在尝试使用java和apache spark 1.0.0版本为决策树分类器实现简单的演示.我的基础是http://spark.apache.org/docs/1.0.0/mllib-decision-tree.html.到目前为止,我已经编写了下面列出的代码.

符合以下代码我得到错误:

org.apache.spark.mllib.tree.impurity.Impurity impurity = new org.apache.spark.mllib.tree.impurity.Entropy();

类型不匹配:无法从Entropy转换为Impurity.这对我来说很奇怪,而类Entropy实现了Impurity接口:

https://spark.apache.org/docs/1.0.0/api/java/org/apache/spark/mllib/tree/impurity/Entropy.html

我正在寻找问题的答案为什么我不能做这个任务？

package decisionTree;

import java.util.regex.Pattern;

import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.mllib.linalg.Vectors;
import org.apache.spark.mllib.regression.LabeledPoint;
import org.apache.spark.mllib.tree.DecisionTree;
import org.apache.spark.mllib.tree.configuration.Algo;
import org.apache.spark.mllib.tree.configuration.Strategy;
import org.apache.spark.mllib.tree.impurity.Gini;
import org.apache.spark.mllib.tree.impurity.Impurity;

import scala.Enumeration.Value;

public final class DecisionTreeDemo {

    static class ParsePoint implements Function<String, LabeledPoint> {
        private static final Pattern COMMA = Pattern.compile(",");
        private static final Pattern SPACE = Pattern.compile(" ");

        @Override
        public LabeledPoint call(String line) {
            String[] parts = COMMA.split(line);
            double y = …

我正在寻找具有良好osgi支持的java orm.我已经阅读过hibernate但是在类加载时会出现一些问题.