mtgencode/scripts/ngrams.py

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#!/usr/bin/env python
import sys
import os
import pickle
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libdir = os.path.join(os.path.dirname(os.path.realpath(__file__)), '../lib')
sys.path.append(libdir)
import jdecode
import nltk_model as model
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def update_ngrams(lines, gramdict, grams):
for line in lines:
for i in range(0, len(line) - (grams - 1)):
ngram = ' '.join([line[i + j] for j in range(0, grams)])
if ngram in gramdict:
gramdict[ngram] += 1
else:
gramdict[ngram] = 1
def describe_bins(gramdict, bins):
bins = sorted(bins)
counts = [0 for _ in range(0, len(bins) + 1)]
for ngram in gramdict:
for i in range(0, len(bins) + 1):
if i < len(bins):
if gramdict[ngram] <= bins[i]:
counts[i] += 1
break
else:
# didn't fit into any of the smaller bins, stick in on the end
counts[-1] += 1
for i in range(0, len(counts)):
if counts[i] > 0:
print((' ' + (str(bins[i]) if i < len(bins) else str(bins[-1]) + '+')
+ ': ' + str(counts[i])))
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def extract_language(cards, separate_lines=True):
if separate_lines:
lang = [line.vectorize() for card in cards for line in card.text_lines]
else:
lang = [card.text.vectorize() for card in cards]
return [s.split() for s in lang]
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def build_ngram_model(cards, n, separate_lines=True, verbose=False):
if verbose:
print(('generating ' + str(n) + '-gram model'))
lang = extract_language(cards, separate_lines=separate_lines)
if verbose:
print(('found ' + str(len(lang)) + ' sentences'))
lm = model.NgramModel(n, lang, pad_left=True, pad_right=True)
if verbose:
print(lm)
return lm
def main(fname, oname, gmin = 2, gmax = 8, nltk = False, sep = False, verbose = False):
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# may need to set special arguments here
cards = jdecode.mtg_open_file(fname, verbose=verbose)
gmin = int(gmin)
gmax = int(gmax)
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if nltk:
n = gmin
lm = build_ngram_model(cards, n, separate_lines=sep, verbose=verbose)
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if verbose:
teststr = 'when @ enters the battlefield'
print(('litmus test: perplexity of ' + repr(teststr)))
print((' ' + str(lm.perplexity(teststr.split()))))
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if verbose:
print(('pickling module to ' + oname))
with open(oname, 'wb') as f:
pickle.dump(lm, f)
else:
bins = [1, 2, 3, 10, 30, 100, 300, 1000]
if gmin < 2 or gmax < gmin:
print('invalid gram sizes: ' + str(gmin) + '-' + str(gmax))
exit(1)
for grams in range(gmin, gmax + 1):
if verbose:
print('generating ' + str(grams) + '-grams...')
gramdict = {}
for card in cards:
update_ngrams(card.text_lines_words, gramdict, grams)
oname_full = oname + '.' + str(grams) + 'g'
if verbose:
print((' writing ' + str(len(gramdict)) + ' unique ' + str(grams)
+ '-grams to ' + oname_full))
describe_bins(gramdict, bins)
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with open(oname_full, 'wt') as f:
for ngram in sorted(gramdict,
lambda x: gramdict[x],
reverse = True):
f.write((ngram + ': ' + str(gramdict[ngram]) + '\n').encode('utf-8'))
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if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('infile', #nargs='?'. default=None,
help='encoded card file or json corpus to process')
parser.add_argument('outfile', #nargs='?', default=None,
help='base name of output file, outputs ending in .2g, .3g etc. will be produced')
parser.add_argument('-min', '--min', action='store', default='2',
help='minimum gram size to compute')
parser.add_argument('-max', '--max', action='store', default='8',
help='maximum gram size to compute')
parser.add_argument('-nltk', '--nltk', action='store_true',
help='use nltk model.NgramModel, with n = min')
parser.add_argument('-s', '--separate', action='store_true',
help='separate card text into lines when constructing nltk model')
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parser.add_argument('-v', '--verbose', action='store_true',
help='verbose output')
args = parser.parse_args()
main(args.infile, args.outfile, gmin=args.min, gmax=args.max, nltk=args.nltk,
sep=args.separate, verbose=args.verbose)
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exit(0)