One hot encoder using xxHash

one_hot_xxhash.py

import xxhash
from keras.preprocessing.text import hashing_trick

# one_hot and hashing_trick in Keras both use by default python's hash function
# it is unstable: https://stackoverflow.com/q/27522626/3986320
# alternatively, you could use md5, but it's not the fastest hashing function
# xxHash package offers a faster alternative

xxh = lambda w: int(xxhash.xxh32(w.encode()).hexdigest(), 16)
one_hot = lambda x, n, **kwargs: hashing_trick(x, n, hash_function=xxh, **kwargs)