Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/8152#issuecomment-130527383
The issue I have with `invert(inputCol, outputCol)` is that it is hard for
me to tell what this method does from its signature. At a first glance, I
thought this is to swap `inputCol` and `outputCol`.
~~~scala
val idxToStr = indexer.inverse
.setInputCol("prediction")
.setOutputCol("predictedLabels")
~~~
reads better than
~~~scala
val idxToStr = indexer.invert("prediction", "predictedLabels")
~~~
though the latter requires less typing.
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