MUC 7 Corpus reader Crashes

[aboSamoor]

r = LazyCorpusLoader('muc_7/', MUCCorpusReader, 'data/..ne.eng.keys.')
r.iob_sents()
[[('Like', 'O'), ('most', 'O'), ('of', 'O'), ('the', 'O'), ('two', 'O'), ('million', 'O'), ('infants', 'O'), ('under', 'O'), ('2', 'O'), ('who', 'O'), ('fly', 'O'), ('with', 'O'), ('their', 'O'), ('parents', 'O'), ('every', 'O'), ('year', 'O'), (',', 'O'), ('Danasia', 'B-PERSON'), ('was', 'O'), ('traveling', 'O'), ('for', 'O'), ('free', 'O'), (',', 'O'), ('seated', 'O'), ('on', 'O'), ('her', 'O'), ('mother', 'O'), ("'s", 'O'), ('lap', 'O'), ('.', 'O')], [('As', 'O'), ('the', 'O'), ('DC-9', 'O'), ('approached', 'O'), ('the', 'O'), ('airport', 'O'), ('on', 'O'), ('July', 'B-DATE'), ('2', 'I-DATE'), (',', 'I-DATE'), ('1994', 'I-DATE'), (',', 'O'), ('wind', 'O'), ('shear', 'O'), ('slammed', 'O'), ('the', 'O'), ('plane', 'O'), ('to', 'O'), ('the', 'O'), ('ground', 'O'), ('.', 'O')], ...]
len(r.iob_sents())
[Tree('S', ['The', Tree('ORGANIZATION', ['Unicef']), 'Flyer', 'flight', 'suffered', 'a', 'setback', Tree('DATE', ['Dec', '.'])]), Tree('DATE', ['Dec', '.'])]
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in len
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 807, in len
if len(self._offsets) <= len(self._list):
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in len
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 807, in len
if len(self._offsets) <= len(self._list):
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in len
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/util.py", line 966, in
return max(len(lst) for lst in self._lists)
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/corpus/reader/util.py", line 379, in len
for tok in self.iterate_from(self._offsets[-1]): pass
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/corpus/reader/util.py", line 401, in iterate_from
for tok in piece.iterate_from(max(0, start_tok-offset)):
File "/usr/local/lib/python2.7/dist-packages/nltk-2.0.1rc4-py2.7.egg/nltk/corpus/reader/util.py", line 298, in iterate_from
tokens = self.read_block(self._stream)
File "/usr/local/lib/python2.7/dist-packages/nltk_contrib/coref/muc.py", line 419, in _read_parsed_block
return map(self._parse, self._read_block(stream))
File "/usr/local/lib/python2.7/dist-packages/nltk_contrib/coref/muc.py", line 428, in _parse
tree = mucstr2tree(doc, top_node='DOC')
File "/usr/local/lib/python2.7/dist-packages/nltk_contrib/coref/muc.py", line 468, in mucstr2tree
'text': _muc_read_text(match.group('text'), top_node),
File "/usr/local/lib/python2.7/dist-packages/nltk_contrib/coref/muc.py", line 534, in _muc_read_text
tree[-1].append(_muc_read_words(sent, 'S'))
File "/usr/local/lib/python2.7/dist-packages/nltk_contrib/coref/muc.py", line 558, in _muc_read_words
assert len(stack) == 1
AssertionError