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#!/usr/bin/env python
import gzip
import os
import sys
HELP = '''Process an input corpus by dividing it into pseudo-documents and uniformly
sampling train, dev, and test sets (simulate uniform sampling at the document
level when document boundaries are unknown)
usage: {} in_file out_prefix doc_size dev_test_docs [-lc]
recommended: doc_size=20, dev_test_docs=100
'''
def gzopen(f):
return gzip.open(f, 'rb') if f.endswith('.gz') else open(f, 'r')
def wc(f):
return sum(1 for _ in gzopen(f))
def main(argv):
if len(argv[1:]) < 4:
sys.stderr.write(HELP.format(os.path.basename(argv[0])))
sys.exit(2)
in_file = os.path.abspath(argv[1])
out_prefix = os.path.abspath(argv[2])
doc_size = int(argv[3])
dev_test_docs = int(argv[4])
lc = (len(argv[1:]) == 5 and argv[5] == '-lc')
corpus_size = wc(in_file)
total_docs = corpus_size / doc_size
leftover = corpus_size % doc_size
train_docs = total_docs - (2 * dev_test_docs)
train_batch_size = (train_docs / dev_test_docs) - 2
sys.stderr.write('Splitting {} lines ({} documents)\n'.format(corpus_size, total_docs + (1 if leftover else 0)))
sys.stderr.write('Train: {} ({})\n'.format((train_docs * doc_size) + leftover, train_docs + (1 if leftover else 0)))
sys.stderr.write('Dev: {} ({})\n'.format(dev_test_docs * doc_size, dev_test_docs))
sys.stderr.write('Test: {} ({})\n'.format(dev_test_docs * doc_size, dev_test_docs))
with gzopen(in_file) as inp, \
open('{}.train'.format(out_prefix), 'w') as train_out, \
open('{}.dev'.format(out_prefix), 'w') as dev_out, \
open('{}.test'.format(out_prefix), 'w') as test_out:
i = 0
for _ in range(dev_test_docs):
for _ in range(train_batch_size):
for _ in range(doc_size):
i += 1
train_out.write('{} ||| {}'.format(i, inp.readline()) if lc else inp.readline())
for _ in range(doc_size):
i += 1
dev_out.write('{} ||| {}'.format(i, inp.readline()) if lc else inp.readline())
for _ in range(doc_size):
i += 1
test_out.write('{} ||| {}'.format(i, inp.readline()) if lc else inp.readline())
for line in inp:
i += 1
train_out.write('{} ||| {}'.format(i, line) if lc else line)
if __name__ == '__main__':
main(sys.argv)
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