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List:       solr-user
Subject:    Knn classifier doesn't work
From:       Adriano <adriano.ruberto () gmail ! com>
Date:       2017-08-30 20:15:19
Message-ID: 1504124119180-0.post () n3 ! nabble ! com
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Hello,

I'm trying to use the knn classifier by following this link:
https://wiki.apache.org/solr/SolrClassification

I use this config :

<requestHandler name="/update" class="solr.UpdateRequestHandler">
    <lst name="defaults">
      <str name="update.chain">classification</str>
    </lst>
  </requestHandler>

and 

  <updateRequestProcessorChain name="classification">
	<processor class="solr.ClassificationUpdateProcessorFactory">
		<str name="inputFields">Title,Body</str>
		<str name="classField">Tags</str>
		<str name="predictedClassField">Tags</str>
		<str name="algorithm">knn</str>
		<str name="knn.k">20</str>
		<str name="knn.minTf">1</str>
		<str name="knn.minDf">5</str>
	</processor>

    	<processor class="solr.LogUpdateProcessorFactory"/>
	<processor class="solr.RunUpdateProcessorFactory" />
  </updateRequestProcessorChain>

For the schema.xml :

  <field name="Title" type="text_en" indexed="true" stored="true"
termVectors="true"/>
  <field name="Body" type="text_en" indexed="true" stored="true"
termVectors="true"/>
  <field name="Tags" type="strings" indexed="true" stored="true"
multiValued="true"/>

There's no error, even in the log.

It's like the updateRequestProcessorChain is not called. So I try with the
bayes and this error occurs :

java.lang.NullPointerException
	at
org.apache.lucene.classification.document.SimpleNaiveBayesDocumentClassifier.assignNormClasses(SimpleNaiveBayesDocumentClassifier.java:116)
  at
org.apache.lucene.classification.document.SimpleNaiveBayesDocumentClassifier.getClasses(SimpleNaiveBayesDocumentClassifier.java:106)
  at
org.apache.solr.update.processor.ClassificationUpdateProcessor.processAdd(ClassificationUpdateProcessor.java:107)
  at
org.apache.solr.handler.loader.JavabinLoader$1.update(JavabinLoader.java:98)
	at
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$1.readOuterMostDocIterator(JavaBinUpdateRequestCodec.java:180)
  at
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$1.readIterator(JavaBinUpdateRequestCodec.java:136)
  at
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:306)
	at org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:251)
	at
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$1.readNamedList(JavaBinUpdateRequestCodec.java:122)
  at
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:271)
	at org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:251)
	at
org.apache.solr.common.util.JavaBinCodec.unmarshal(JavaBinCodec.java:173)
	at
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec.unmarshal(JavaBinUpdateRequestCodec.java:187)
  at
org.apache.solr.handler.loader.JavabinLoader.parseAndLoadDocs(JavabinLoader.java:108)
	at org.apache.solr.handler.loader.JavabinLoader.load(JavabinLoader.java:55)
	at
org.apache.solr.handler.UpdateRequestHandler$1.load(UpdateRequestHandler.java:97)
	at
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:68)
  at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:173)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2477)
	at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:723)
	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:529)
	at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:361)
	at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:305)
	at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
  at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
	at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
	at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
	at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
	at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
	at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
	at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
  at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
	at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
	at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.server.Server.handle(Server.java:534)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
	at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
	at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
  at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
	at
org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
	at
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
  at
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
  at
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
  at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
	at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
	at java.lang.Thread.run(Thread.java:748)

What am I doing wrong ? Did I miss something ?





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