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https://issues.apache.org/jira/browse/SPARK-20673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng closed SPARK-20673.
--------------------------------
Resolution: Duplicate
> LDA `optimizer` do not really support case insensitive
> -------------------------------------------------------
>
> Key: SPARK-20673
> URL: https://issues.apache.org/jira/browse/SPARK-20673
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.2.0
> Reporter: zhengruifeng
> Priority: Minor
>
> The declaration of {{optimizer}} in {{LDA}} suggest that it should be case
> insensitive:
> {code}
> final val optimizer = new Param[String](this, "optimizer", "Optimizer or
> inference" +
> " algorithm used to estimate the LDA model. Supported: " +
> supportedOptimizers.mkString(", "),
> (o: String) =>
>
> ParamValidators.inArray(supportedOptimizers).apply(o.toLowerCase(Locale.ROOT)))
> {code}
> However, it do not support uppercase:
> {code}
> scala> val lda = new LDA().setOptimizer("Em")
> lda: org.apache.spark.ml.clustering.LDA = lda_dde23ccc5792
> scala> lda.getOptimizer
> res18: String = Em
> scala> lda.fit(dataset)
> scala.MatchError: Em (of class java.lang.String)
> at
> org.apache.spark.ml.clustering.LDAParams$class.getOldOptimizer(LDA.scala:351)
> at org.apache.spark.ml.clustering.LDA.getOldOptimizer(LDA.scala:809)
> at org.apache.spark.ml.clustering.LDA.fit(LDA.scala:898)
> ... 54 elided
> {code}
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