zhengruifeng created SPARK-20673:
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Summary: 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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