org.apache.spark.ml.feature
Classes 
Binarizer
Bucketizer
ElementwiseProduct
HashingTF
IDF
IDFModel
Normalizer
OneHotEncoder
PolynomialExpansion
RegexTokenizer
StandardScaler
StandardScalerModel
StringIndexer
StringIndexerModel
Tokenizer
VectorAssembler
VectorIndexer
VectorIndexer.CategoryStats
VectorIndexerModel
Word2Vec
Word2VecModel