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#!/usr/bin/env python
import sys, math, itertools, getopt
def usage():
print >>sys.stderr, 'Usage:', sys.argv[0], '[-s slash_threshold] input file'
sys.exit(0)
optlist, args = getopt.getopt(sys.argv[1:], 'hs:')
slash_threshold = None
for opt, arg in optlist:
if opt == '-s':
slash_threshold = int(arg)
else:
usage()
if len(args) != 1:
usage()
infile = open(args[0])
N = 0
frequencies = {}
for line in infile:
for part in line.split('||| ')[1].split():
tag = part.split(':',1)[1]
if slash_threshold == None or tag.count('/') + tag.count('\\') <= slash_threshold:
frequencies.setdefault(gtag, 0)
frequencies[gtag] += 1
N += 1
h = 0
for tag, c in frequencies.items():
h -= c * (math.log(c, 2) - math.log(N, 2))
h /= N
print 'entropy', h
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