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https://issues.apache.org/jira/browse/MAHOUT-1006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288662#comment-13288662
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Robin Anil commented on MAHOUT-1006:
------------------------------------
This is the output of 20% split test using ted encoder
encoding takes 200 seconds
train 222s
test 117s
12/06/04 18:18:49 INFO test.TestNaiveBayesDriver: Complementary Results:
=======================================================
Summary
-------------------------------------------------------
Correctly Classified Instances : 68302 97.8342%
Incorrectly Classified Instances : 1512 2.1658%
Total Classified Instances : 69814
=======================================================
Confusion Matrix
-------------------------------------------------------
a b <--Classified as
27633 796 | 28429 a = commons.apache.org
716 40669 | 41385 b = cocoon.apache.org
> Example from book no longer works - prepare20newsgroups broken with Lucene
> upgrade
> ----------------------------------------------------------------------------------
>
> Key: MAHOUT-1006
> URL: https://issues.apache.org/jira/browse/MAHOUT-1006
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.7
> Reporter: Ted Dunning
> Assignee: Robin Anil
> Priority: Critical
> Fix For: 0.7
>
> Attachments: MAHOUT-1006.patch
>
>
> The StandardAnalyzer from Lucene no longer has a no-args constructor. Our
> code uses reflection to create this class, but looks for a no-args
> constructor and that causes this:
> {code}
> ./bin/mahout prepare20newsgroups -p 20news-bydate-train/ -o 20news-train/ -a
> org.apache.lucene.analysis.standard.StandardAnalyzer -c UTF-8
> MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
> no HADOOP_HOME set, running locally
> Unable to find a $JAVA_HOME at "/usr", continuing with system-provided Java...
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/hadoop/mahout/examples/target/mahout-examples-0.7-SNAPSHOT-job.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-jcl-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> Exception in thread "main" java.lang.IllegalStateException:
> java.lang.NoSuchMethodException:
> org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
> at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:68)
> at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:28)
> at
> org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups.main(PrepareTwentyNewsgroups.java:89)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
> at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
> at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188)
> Caused by: java.lang.NoSuchMethodException:
> org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
> at java.lang.Class.getConstructor0(Class.java:2706)
> at java.lang.Class.getConstructor(Class.java:1657)
> at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:62)
> ... 9 more
> {code}
> This is really bad.
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