Question

我正在使用Apache Spark的示例代码跟踪文档：https://spark.apache.org/docs/latest/ml-features.html#countvectorizer

    import java.util.Arrays;
    import org.apache.spark.SparkConf;
    import org.apache.spark.api.java.JavaSparkContext;
    import org.apache.spark.ml.feature.CountVectorizer;
    import org.apache.spark.ml.feature.CountVectorizerModel;
    import org.apache.spark.sql.DataFrame;
    import org.apache.spark.sql.Row;
    import org.apache.spark.sql.RowFactory;
    import org.apache.spark.sql.SQLContext;
    import org.apache.spark.sql.types.*;
    public class CountVectorizer_Demo {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setAppName("LDA Online").setMaster(
                "local");
        JavaSparkContext sc = new JavaSparkContext(conf);

        SQLContext sqlContext = new SQLContext(sc);

        // Input data: Each row is a bag of words from a sentence or document.
        JavaRDD<Row> jrdd = sc.parallelize(Arrays.asList(
          RowFactory.create(Arrays.asList("a", "b", "c")),
          RowFactory.create(Arrays.asList("a", "b", "b", "c", "a"))
        ));
        StructType schema = new StructType(new StructField [] {
          new StructField("text", new ArrayType(DataTypes.StringType, true), false, Metadata.empty())
        });
        DataFrame df = sqlContext.createDataFrame(jrdd, schema);

        // fit a CountVectorizerModel from the corpus
        CountVectorizerModel cvModel = new CountVectorizer()
          .setInputCol("text")
          .setOutputCol("feature")
          .setVocabSize(3)
          .setMinDF(2) // a term must appear in more or equal to 2 documents to be included in the vocabulary
          .fit(df);

        // alternatively, define CountVectorizerModel with a-priori vocabulary
        CountVectorizerModel cvm = new CountVectorizerModel(new String[]{"a", "b", "c"})
          .setInputCol("text")
          .setOutputCol("feature");

        cvModel.transform(df).show();
    }
}

但我收到了错误消息：

15/10/22 23:04:20 INFO BlockManagerMasterActor：注册块管理器localhost：56882，内存为703.6 MB，BlockManagerId（，localhost，56882） 15/10/22 23:04:20 INFO BlockManagerMaster：已注册的BlockManager 线程“main”中的异常java.lang.NoClassDefFoundError：org / apache / spark / sql / catalyst / InternalRow at org.apache.spark.ml.feature.CountVectorizerParams $ class.validateAndTransformSchema（CountVectorizer.scala：72）在org.apache.spark.ml.feature.CountVectorizer.validateAndTransformSchema（CountVectorizer.scala：107）在org.apache.spark.ml.feature.CountVectorizer.transformSchema（CountVectorizer.scala：168）在org.apache.spark.ml.PipelineStage.transformSchema（Pipeline.scala：62）在org.apache.spark.ml.feature.CountVectorizer.fit（CountVectorizer.scala：130） at main.CountVectorizer_Demo.main（CountVectorizer_Demo.java:39）引起：java.lang.ClassNotFoundException：org.apache.spark.sql.catalyst.InternalRow 在java.net.URLClassLoader $ 1.run（URLClassLoader.java:366）在java.net.URLClassLoader $ 1.run（URLClassLoader.java:355） at java.security.AccessController.doPrivileged（Native Method）在java.net.URLClassLoader.findClass（URLClassLoader.java:354） at java.lang.ClassLoader.loadClass（ClassLoader.java:425） at sun.misc.Launcher $ AppClassLoader.loadClass（Launcher.java:308） at java.lang.ClassLoader.loadClass（ClassLoader.java:358） ......还有6个

提前感谢。

Answer 1

非常感谢大家。我通过添加依赖来解决我的问题：

<dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-catalyst_2.10</artifactId>
    <version>1.5.1</version>
</dependency>

使用apache spark计算CountVectorizerModel错误 - Java API

1 个答案: