tf.keras.preprocessing.text.hashing_trick

Converts a text to a sequence of indexes in a fixed-size hashing space.

tf.keras.preprocessing.text.hashing_trick(
    text,
    n,
    hash_function=None,
    filters='!"#$%&()*+,-./:;<=>?@[\\]^_`{|}~\t\n',
    lower=True,
    split=' '
)

text Input text (string).
n Dimension of the hashing space.
hash_function defaults to python hash function, can be 'md5' or any function that takes in input a string and returns a int. Note that 'hash' is not a stable hashing function, so it is not consistent across different runs, while 'md5' is a stable hashing function.
filters list (or concatenation) of characters to filter out, such as punctuation. Default: !"#$%&()*+,-./:;<=>?@[\]^_`{|}~\t\n, includes basic punctuation, tabs, and newlines.
lower boolean. Whether to set the text to lowercase.
split str. Separator for word splitting.

A list of integer word indices (unicity non-guaranteed).

0 is a reserved index that won't be assigned to any word.

Two or more words may be assigned to the same index, due to possible collisions by the hashing function. The probability of a collision is in relation to the dimension of the hashing space and the number of distinct objects.