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mreid / huffman.py
Last active September 25, 2021 12:22
Example implementation of Huffman coding in Python
# Example Huffman coding implementation
# Distributions are represented as dictionaries of { 'symbol': probability }
# Codes are dictionaries too: { 'symbol': 'codeword' }
def huffman(p):
'''Return a Huffman code for an ensemble with distribution p.'''
assert(sum(p.values()) == 1.0) # Ensure probabilities sum to 1
# Base case of only two symbols, assign 0 or 1 arbitrarily
if(len(p) == 2):
@mreid
mreid / arithmetic.py
Last active August 29, 2015 14:07
Toy implementation of arithmetic coding as described in Cover & Thomas §13.3
# Example implementation of simple arithmetic coding in Python (2.7+).
#
# USAGE
#
# python -i arithmetic.py
# >>> m = {'a': 1, 'b': 1, 'c': 1}
# >>> model = dirichlet(m)
# >>> encode(model, "aabbaacc")
# '00011110011110010'
#