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535 lines
17 KiB
Python
535 lines
17 KiB
Python
# Natural Language Toolkit: PropBank Corpus Reader
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#
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# Copyright (C) 2001-2020 NLTK Project
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# Author: Edward Loper <edloper@gmail.com>
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# URL: <http://nltk.org/>
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# For license information, see LICENSE.TXT
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import re
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from functools import total_ordering
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from xml.etree import ElementTree
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from nltk.tree import Tree
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from nltk.internals import raise_unorderable_types
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from nltk.corpus.reader.util import *
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from nltk.corpus.reader.api import *
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class PropbankCorpusReader(CorpusReader):
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"""
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Corpus reader for the propbank corpus, which augments the Penn
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Treebank with information about the predicate argument structure
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of every verb instance. The corpus consists of two parts: the
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predicate-argument annotations themselves, and a set of "frameset
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files" which define the argument labels used by the annotations,
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on a per-verb basis. Each "frameset file" contains one or more
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predicates, such as ``'turn'`` or ``'turn_on'``, each of which is
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divided into coarse-grained word senses called "rolesets". For
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each "roleset", the frameset file provides descriptions of the
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argument roles, along with examples.
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"""
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def __init__(
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self,
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root,
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propfile,
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framefiles="",
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verbsfile=None,
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parse_fileid_xform=None,
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parse_corpus=None,
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encoding="utf8",
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):
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"""
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:param root: The root directory for this corpus.
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:param propfile: The name of the file containing the predicate-
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argument annotations (relative to ``root``).
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:param framefiles: A list or regexp specifying the frameset
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fileids for this corpus.
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:param parse_fileid_xform: A transform that should be applied
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to the fileids in this corpus. This should be a function
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of one argument (a fileid) that returns a string (the new
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fileid).
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:param parse_corpus: The corpus containing the parse trees
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corresponding to this corpus. These parse trees are
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necessary to resolve the tree pointers used by propbank.
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"""
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# If framefiles is specified as a regexp, expand it.
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if isinstance(framefiles, str):
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framefiles = find_corpus_fileids(root, framefiles)
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framefiles = list(framefiles)
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# Initialze the corpus reader.
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CorpusReader.__init__(self, root, [propfile, verbsfile] + framefiles, encoding)
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# Record our frame fileids & prop file.
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self._propfile = propfile
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self._framefiles = framefiles
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self._verbsfile = verbsfile
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self._parse_fileid_xform = parse_fileid_xform
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self._parse_corpus = parse_corpus
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def raw(self, fileids=None):
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"""
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:return: the text contents of the given fileids, as a single string.
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"""
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if fileids is None:
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fileids = self._fileids
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elif isinstance(fileids):
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fileids = [fileids]
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return concat([self.open(f).read() for f in fileids])
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def instances(self, baseform=None):
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"""
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:return: a corpus view that acts as a list of
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``PropBankInstance`` objects, one for each noun in the corpus.
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"""
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kwargs = {}
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if baseform is not None:
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kwargs["instance_filter"] = lambda inst: inst.baseform == baseform
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return StreamBackedCorpusView(
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self.abspath(self._propfile),
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lambda stream: self._read_instance_block(stream, **kwargs),
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encoding=self.encoding(self._propfile),
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)
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def lines(self):
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"""
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:return: a corpus view that acts as a list of strings, one for
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each line in the predicate-argument annotation file.
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"""
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return StreamBackedCorpusView(
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self.abspath(self._propfile),
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read_line_block,
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encoding=self.encoding(self._propfile),
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)
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def roleset(self, roleset_id):
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"""
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:return: the xml description for the given roleset.
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"""
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baseform = roleset_id.split(".")[0]
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framefile = "frames/%s.xml" % baseform
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if framefile not in self._framefiles:
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raise ValueError("Frameset file for %s not found" % roleset_id)
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# n.b.: The encoding for XML fileids is specified by the file
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# itself; so we ignore self._encoding here.
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etree = ElementTree.parse(self.abspath(framefile).open()).getroot()
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for roleset in etree.findall("predicate/roleset"):
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if roleset.attrib["id"] == roleset_id:
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return roleset
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raise ValueError("Roleset %s not found in %s" % (roleset_id, framefile))
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def rolesets(self, baseform=None):
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"""
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:return: list of xml descriptions for rolesets.
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"""
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if baseform is not None:
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framefile = "frames/%s.xml" % baseform
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if framefile not in self._framefiles:
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raise ValueError("Frameset file for %s not found" % baseform)
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framefiles = [framefile]
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else:
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framefiles = self._framefiles
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rsets = []
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for framefile in framefiles:
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# n.b.: The encoding for XML fileids is specified by the file
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# itself; so we ignore self._encoding here.
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etree = ElementTree.parse(self.abspath(framefile).open()).getroot()
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rsets.append(etree.findall("predicate/roleset"))
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return LazyConcatenation(rsets)
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def verbs(self):
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"""
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:return: a corpus view that acts as a list of all verb lemmas
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in this corpus (from the verbs.txt file).
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"""
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return StreamBackedCorpusView(
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self.abspath(self._verbsfile),
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read_line_block,
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encoding=self.encoding(self._verbsfile),
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)
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def _read_instance_block(self, stream, instance_filter=lambda inst: True):
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block = []
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# Read 100 at a time.
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for i in range(100):
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line = stream.readline().strip()
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if line:
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inst = PropbankInstance.parse(
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line, self._parse_fileid_xform, self._parse_corpus
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)
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if instance_filter(inst):
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block.append(inst)
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return block
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######################################################################
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# { Propbank Instance & related datatypes
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######################################################################
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class PropbankInstance(object):
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def __init__(
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self,
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fileid,
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sentnum,
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wordnum,
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tagger,
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roleset,
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inflection,
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predicate,
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arguments,
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parse_corpus=None,
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):
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self.fileid = fileid
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"""The name of the file containing the parse tree for this
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instance's sentence."""
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self.sentnum = sentnum
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"""The sentence number of this sentence within ``fileid``.
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Indexing starts from zero."""
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self.wordnum = wordnum
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"""The word number of this instance's predicate within its
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containing sentence. Word numbers are indexed starting from
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zero, and include traces and other empty parse elements."""
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self.tagger = tagger
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"""An identifier for the tagger who tagged this instance; or
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``'gold'`` if this is an adjuticated instance."""
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self.roleset = roleset
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"""The name of the roleset used by this instance's predicate.
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Use ``propbank.roleset() <PropbankCorpusReader.roleset>`` to
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look up information about the roleset."""
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self.inflection = inflection
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"""A ``PropbankInflection`` object describing the inflection of
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this instance's predicate."""
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self.predicate = predicate
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"""A ``PropbankTreePointer`` indicating the position of this
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instance's predicate within its containing sentence."""
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self.arguments = tuple(arguments)
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"""A list of tuples (argloc, argid), specifying the location
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and identifier for each of the predicate's argument in the
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containing sentence. Argument identifiers are strings such as
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``'ARG0'`` or ``'ARGM-TMP'``. This list does *not* contain
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the predicate."""
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self.parse_corpus = parse_corpus
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"""A corpus reader for the parse trees corresponding to the
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instances in this propbank corpus."""
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@property
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def baseform(self):
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"""The baseform of the predicate."""
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return self.roleset.split(".")[0]
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@property
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def sensenumber(self):
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"""The sense number of the predicate."""
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return self.roleset.split(".")[1]
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@property
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def predid(self):
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"""Identifier of the predicate."""
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return "rel"
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def __repr__(self):
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return "<PropbankInstance: %s, sent %s, word %s>" % (
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self.fileid,
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self.sentnum,
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self.wordnum,
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)
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def __str__(self):
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s = "%s %s %s %s %s %s" % (
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self.fileid,
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self.sentnum,
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self.wordnum,
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self.tagger,
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self.roleset,
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self.inflection,
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)
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items = self.arguments + ((self.predicate, "rel"),)
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for (argloc, argid) in sorted(items):
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s += " %s-%s" % (argloc, argid)
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return s
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def _get_tree(self):
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if self.parse_corpus is None:
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return None
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if self.fileid not in self.parse_corpus.fileids():
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return None
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return self.parse_corpus.parsed_sents(self.fileid)[self.sentnum]
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tree = property(
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_get_tree,
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doc="""
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The parse tree corresponding to this instance, or None if
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the corresponding tree is not available.""",
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)
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@staticmethod
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def parse(s, parse_fileid_xform=None, parse_corpus=None):
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pieces = s.split()
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if len(pieces) < 7:
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raise ValueError("Badly formatted propbank line: %r" % s)
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# Divide the line into its basic pieces.
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(fileid, sentnum, wordnum, tagger, roleset, inflection) = pieces[:6]
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rel = [p for p in pieces[6:] if p.endswith("-rel")]
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args = [p for p in pieces[6:] if not p.endswith("-rel")]
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if len(rel) != 1:
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raise ValueError("Badly formatted propbank line: %r" % s)
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# Apply the fileid selector, if any.
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if parse_fileid_xform is not None:
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fileid = parse_fileid_xform(fileid)
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# Convert sentence & word numbers to ints.
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sentnum = int(sentnum)
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wordnum = int(wordnum)
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# Parse the inflection
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inflection = PropbankInflection.parse(inflection)
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# Parse the predicate location.
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predicate = PropbankTreePointer.parse(rel[0][:-4])
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# Parse the arguments.
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arguments = []
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for arg in args:
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argloc, argid = arg.split("-", 1)
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arguments.append((PropbankTreePointer.parse(argloc), argid))
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# Put it all together.
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return PropbankInstance(
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fileid,
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sentnum,
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wordnum,
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tagger,
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roleset,
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inflection,
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predicate,
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arguments,
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parse_corpus,
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)
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class PropbankPointer(object):
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"""
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A pointer used by propbank to identify one or more constituents in
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a parse tree. ``PropbankPointer`` is an abstract base class with
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three concrete subclasses:
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- ``PropbankTreePointer`` is used to point to single constituents.
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- ``PropbankSplitTreePointer`` is used to point to 'split'
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constituents, which consist of a sequence of two or more
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``PropbankTreePointer`` pointers.
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- ``PropbankChainTreePointer`` is used to point to entire trace
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chains in a tree. It consists of a sequence of pieces, which
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can be ``PropbankTreePointer`` or ``PropbankSplitTreePointer`` pointers.
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"""
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def __init__(self):
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if self.__class__ == PropbankPointer:
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raise NotImplementedError()
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class PropbankChainTreePointer(PropbankPointer):
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def __init__(self, pieces):
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self.pieces = pieces
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"""A list of the pieces that make up this chain. Elements may
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be either ``PropbankSplitTreePointer`` or
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``PropbankTreePointer`` pointers."""
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def __str__(self):
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return "*".join("%s" % p for p in self.pieces)
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def __repr__(self):
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return "<PropbankChainTreePointer: %s>" % self
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def select(self, tree):
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if tree is None:
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raise ValueError("Parse tree not avaialable")
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return Tree("*CHAIN*", [p.select(tree) for p in self.pieces])
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class PropbankSplitTreePointer(PropbankPointer):
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def __init__(self, pieces):
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self.pieces = pieces
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"""A list of the pieces that make up this chain. Elements are
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all ``PropbankTreePointer`` pointers."""
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def __str__(self):
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return ",".join("%s" % p for p in self.pieces)
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def __repr__(self):
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return "<PropbankSplitTreePointer: %s>" % self
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def select(self, tree):
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if tree is None:
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raise ValueError("Parse tree not avaialable")
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return Tree("*SPLIT*", [p.select(tree) for p in self.pieces])
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@total_ordering
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class PropbankTreePointer(PropbankPointer):
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"""
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wordnum:height*wordnum:height*...
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wordnum:height,
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"""
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def __init__(self, wordnum, height):
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self.wordnum = wordnum
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self.height = height
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@staticmethod
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def parse(s):
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# Deal with chains (xx*yy*zz)
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pieces = s.split("*")
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if len(pieces) > 1:
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return PropbankChainTreePointer(
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[PropbankTreePointer.parse(elt) for elt in pieces]
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)
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# Deal with split args (xx,yy,zz)
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pieces = s.split(",")
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if len(pieces) > 1:
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return PropbankSplitTreePointer(
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[PropbankTreePointer.parse(elt) for elt in pieces]
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)
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# Deal with normal pointers.
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pieces = s.split(":")
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if len(pieces) != 2:
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raise ValueError("bad propbank pointer %r" % s)
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return PropbankTreePointer(int(pieces[0]), int(pieces[1]))
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def __str__(self):
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return "%s:%s" % (self.wordnum, self.height)
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def __repr__(self):
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return "PropbankTreePointer(%d, %d)" % (self.wordnum, self.height)
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def __eq__(self, other):
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while isinstance(other, (PropbankChainTreePointer, PropbankSplitTreePointer)):
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other = other.pieces[0]
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if not isinstance(other, PropbankTreePointer):
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return self is other
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return self.wordnum == other.wordnum and self.height == other.height
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def __ne__(self, other):
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return not self == other
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def __lt__(self, other):
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while isinstance(other, (PropbankChainTreePointer, PropbankSplitTreePointer)):
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other = other.pieces[0]
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if not isinstance(other, PropbankTreePointer):
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return id(self) < id(other)
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return (self.wordnum, -self.height) < (other.wordnum, -other.height)
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def select(self, tree):
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if tree is None:
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raise ValueError("Parse tree not avaialable")
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return tree[self.treepos(tree)]
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def treepos(self, tree):
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"""
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Convert this pointer to a standard 'tree position' pointer,
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given that it points to the given tree.
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"""
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if tree is None:
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raise ValueError("Parse tree not avaialable")
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stack = [tree]
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treepos = []
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wordnum = 0
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while True:
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# tree node:
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if isinstance(stack[-1], Tree):
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# Select the next child.
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if len(treepos) < len(stack):
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treepos.append(0)
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else:
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treepos[-1] += 1
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# Update the stack.
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if treepos[-1] < len(stack[-1]):
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stack.append(stack[-1][treepos[-1]])
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else:
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# End of node's child list: pop up a level.
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stack.pop()
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treepos.pop()
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# word node:
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else:
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if wordnum == self.wordnum:
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return tuple(treepos[: len(treepos) - self.height - 1])
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else:
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wordnum += 1
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stack.pop()
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class PropbankInflection(object):
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# { Inflection Form
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INFINITIVE = "i"
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GERUND = "g"
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PARTICIPLE = "p"
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FINITE = "v"
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# { Inflection Tense
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FUTURE = "f"
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PAST = "p"
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PRESENT = "n"
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# { Inflection Aspect
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PERFECT = "p"
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PROGRESSIVE = "o"
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PERFECT_AND_PROGRESSIVE = "b"
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# { Inflection Person
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THIRD_PERSON = "3"
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# { Inflection Voice
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ACTIVE = "a"
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PASSIVE = "p"
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# { Inflection
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NONE = "-"
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# }
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def __init__(self, form="-", tense="-", aspect="-", person="-", voice="-"):
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self.form = form
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self.tense = tense
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self.aspect = aspect
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self.person = person
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self.voice = voice
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def __str__(self):
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return self.form + self.tense + self.aspect + self.person + self.voice
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def __repr__(self):
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return "<PropbankInflection: %s>" % self
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_VALIDATE = re.compile(r"[igpv\-][fpn\-][pob\-][3\-][ap\-]$")
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@staticmethod
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def parse(s):
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if not isinstance(s, str):
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raise TypeError("expected a string")
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if len(s) != 5 or not PropbankInflection._VALIDATE.match(s):
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raise ValueError("Bad propbank inflection string %r" % s)
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return PropbankInflection(*s)
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