Details
Minor Description
as per: http://apache-spark-user-list.1001560.n3.nabble.com/Using-TF-IDF-from-MLlib-td19429.html#a19528
Having the IDF.fit accept LabelPoints would be useful since, correct me if i'm wrong, there currently isn't a way of keeping track of which labels belong to which documents if one needs to apply a conventional tf-idf transformation on labelled text data.