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Computes a bag of "words" based on the specified ngram configuration.

A light wrapper around tft.ngrams. First computes ngrams, then transforms the ngram representation (list semantics) into a Bag of Words (set semantics) per row. Each row reflects the set of unique ngrams present in an input record.

See tft.ngrams for more information.

tokens a two-dimensional SparseTensor of dtype tf.string containing tokens that will be used to construct a bag of words.
ngram_range A pair with the range (inclusive) of ngram sizes to compute.
separator a string that will be inserted between tokens when ngrams are constructed.
name (Optional) A name for this operation.

A SparseTensor containing the unique set of ngrams from each row of the input. Note: the original order of the ngrams may not be preserved.