train_adadelta_regr(array features, float target [, constant string options]) – Returns a relation consists of Platforms:

train_adagrad_rda(list features, int label [, const string options]) – Returns a relation consists of Build

to_timestamp(timestamp_str[, fmt]) – Parses the `timestamp_str` expression with the `fmt` expression to a timestamp. Returns

to_unix_timestamp(timeExp[, format]) – Returns the UNIX timestamp of the given time. Platforms: WhereOS, Spark, Hive

to_utc_timestamp(timestamp, timezone) – Given a timestamp like ‘2017-07-14 02:40:00.0’, interprets it as a time in

to_sparse(array feature_vector) – Returns a sparse feature in array Platforms: WhereOS, Spark, Hive Class: hivemall.ftvec.conv.ToSparseFeaturesUDF