mirror of
https://github.com/explosion/spaCy.git
synced 2024-11-11 04:08:09 +03:00
113 lines
3.9 KiB
Python
113 lines
3.9 KiB
Python
# coding: utf8
|
|
from __future__ import unicode_literals
|
|
|
|
from .symbols import POS, NOUN, VERB, ADJ, PUNCT, PROPN
|
|
from .symbols import VerbForm_inf, VerbForm_none, Number_sing, Degree_pos
|
|
|
|
|
|
class Lemmatizer(object):
|
|
@classmethod
|
|
def load(cls, path, index=None, exc=None, rules=None, lookup=None):
|
|
return cls(index, exc, rules, lookup)
|
|
|
|
def __init__(self, index=None, exceptions=None, rules=None, lookup=None):
|
|
self.index = index
|
|
self.exc = exceptions
|
|
self.rules = rules
|
|
self.lookup_table = lookup if lookup is not None else {}
|
|
|
|
def __call__(self, string, univ_pos, morphology=None):
|
|
if not self.rules:
|
|
return [self.lookup_table.get(string, string)]
|
|
if univ_pos in (NOUN, 'NOUN', 'noun'):
|
|
univ_pos = 'noun'
|
|
elif univ_pos in (VERB, 'VERB', 'verb'):
|
|
univ_pos = 'verb'
|
|
elif univ_pos in (ADJ, 'ADJ', 'adj'):
|
|
univ_pos = 'adj'
|
|
elif univ_pos in (PUNCT, 'PUNCT', 'punct'):
|
|
univ_pos = 'punct'
|
|
elif univ_pos in (PROPN, 'PROPN'):
|
|
return [string]
|
|
else:
|
|
return [string.lower()]
|
|
# See Issue #435 for example of where this logic is requied.
|
|
if self.is_base_form(univ_pos, morphology):
|
|
return [string.lower()]
|
|
lemmas = lemmatize(string, self.index.get(univ_pos, {}),
|
|
self.exc.get(univ_pos, {}),
|
|
self.rules.get(univ_pos, []))
|
|
return lemmas
|
|
|
|
def is_base_form(self, univ_pos, morphology=None):
|
|
"""
|
|
Check whether we're dealing with an uninflected paradigm, so we can
|
|
avoid lemmatization entirely.
|
|
"""
|
|
morphology = {} if morphology is None else morphology
|
|
others = [key for key in morphology
|
|
if key not in (POS, 'Number', 'POS', 'VerbForm', 'Tense')]
|
|
if univ_pos == 'noun' and morphology.get('Number') == 'sing':
|
|
return True
|
|
elif univ_pos == 'verb' and morphology.get('VerbForm') == 'inf':
|
|
return True
|
|
# This maps 'VBP' to base form -- probably just need 'IS_BASE'
|
|
# morphology
|
|
elif univ_pos == 'verb' and (morphology.get('VerbForm') == 'fin' and
|
|
morphology.get('Tense') == 'pres' and
|
|
morphology.get('Number') is None and
|
|
not others):
|
|
return True
|
|
elif univ_pos == 'adj' and morphology.get('Degree') == 'pos':
|
|
return True
|
|
elif VerbForm_inf in morphology:
|
|
return True
|
|
elif VerbForm_none in morphology:
|
|
return True
|
|
elif Number_sing in morphology:
|
|
return True
|
|
elif Degree_pos in morphology:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
def noun(self, string, morphology=None):
|
|
return self(string, 'noun', morphology)
|
|
|
|
def verb(self, string, morphology=None):
|
|
return self(string, 'verb', morphology)
|
|
|
|
def adj(self, string, morphology=None):
|
|
return self(string, 'adj', morphology)
|
|
|
|
def punct(self, string, morphology=None):
|
|
return self(string, 'punct', morphology)
|
|
|
|
def lookup(self, string):
|
|
if string in self.lookup_table:
|
|
return self.lookup_table[string]
|
|
return string
|
|
|
|
|
|
def lemmatize(string, index, exceptions, rules):
|
|
orig = string
|
|
string = string.lower()
|
|
forms = []
|
|
forms.extend(exceptions.get(string, []))
|
|
oov_forms = []
|
|
if not forms:
|
|
for old, new in rules:
|
|
if string.endswith(old):
|
|
form = string[:len(string) - len(old)] + new
|
|
if not form:
|
|
pass
|
|
elif form in index or not form.isalpha():
|
|
forms.append(form)
|
|
else:
|
|
oov_forms.append(form)
|
|
if not forms:
|
|
forms.extend(oov_forms)
|
|
if not forms:
|
|
forms.append(orig)
|
|
return list(set(forms))
|