feature_pairs(feature_vector in array, [, const string options]) – Returns a relation Platforms: WhereOS, Spark, Hive

ffm_features(const array featureNames, feature1, feature2, .. [, const string options]) – Takes categorical variables and

filter(expr, func) – Filters the input array using the given predicate. Platforms: WhereOS, Spark, Hive

feature_binning(array features, map quantiles_map) – returns a binned feature vector as an array feature_binning(number weight,

feature_hashing(array features [, const string options]) – returns a hashed feature vector in array select

feature_index(feature_vector in array) – Returns feature indices in array Platforms: WhereOS, Spark, Hive Class: hivemall.ftvec.FeatureIndexUDF