mirror of
https://github.com/explosion/spaCy.git
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144 lines
4.8 KiB
Python
144 lines
4.8 KiB
Python
from __future__ import unicode_literals
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from os import path
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import re
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from .. import orth
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from ..vocab import Vocab
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from ..tokenizer import Tokenizer
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from ..syntax.parser import GreedyParser
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from ..tokens import Tokens
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from .pos import EnPosTagger
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from .pos import POS_TAGS
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from .attrs import get_flags
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from ..util import read_lang_data
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def get_lex_props(string):
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return {
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'flags': get_flags(string),
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'length': len(string),
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'orth': string,
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'lower': string.lower(),
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'norm': string,
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'shape': orth.word_shape(string),
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'prefix': string[0],
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'suffix': string[-3:],
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'cluster': 0,
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'prob': 0,
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'sentiment': 0
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}
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LOCAL_DATA_DIR = path.join(path.dirname(__file__), 'data')
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parse_if_model_present = -1
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class English(object):
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"""The English NLP pipeline.
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Provides a tokenizer, lexicon, part-of-speech tagger and parser.
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Keyword args:
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data_dir (unicode): A path to a directory, from which to load the pipeline.
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If None, looks for a directory named "data/" in the same directory as
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the present file, i.e. path.join(path.dirname(__file__, 'data')).
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If path.join(data_dir, 'pos') exists, the tagger is loaded from there.
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If path.join(data_dir, 'deps') exists, the parser is loaded from there.
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"""
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def __init__(self, data_dir=LOCAL_DATA_DIR):
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self._data_dir = data_dir
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self.vocab = Vocab(data_dir=path.join(data_dir, 'vocab') if data_dir else None,
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get_lex_props=get_lex_props)
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tag_names = list(POS_TAGS.keys())
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tag_names.sort()
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if data_dir is None:
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tok_rules = {}
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prefix_re = None
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suffix_re = None
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infix_re = None
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else:
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tok_data_dir = path.join(data_dir, 'tokenizer')
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tok_rules, prefix_re, suffix_re, infix_re = read_lang_data(tok_data_dir)
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prefix_re = re.compile(prefix_re)
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suffix_re = re.compile(suffix_re)
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infix_re = re.compile(infix_re)
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self.tokenizer = Tokenizer(self.vocab, tok_rules, prefix_re,
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suffix_re, infix_re,
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POS_TAGS, tag_names)
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self._tagger = None
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self._parser = None
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self.has_parser_model = path.exists(path.join(self._data_dir, 'deps'))
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self.has_tagger_model = path.exists(path.join(self._data_dir, 'pos'))
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@property
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def tagger(self):
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if self._tagger is None:
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self._tagger = EnPosTagger(self.vocab.strings, self._data_dir)
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return self._tagger
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@property
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def parser(self):
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if self._parser is None:
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self._parser = GreedyParser(path.join(self._data_dir, 'deps'))
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return self._parser
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def __call__(self, text, tag=True, parse=parse_if_model_present):
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"""Apply the pipeline to some text. The text can span multiple sentences,
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and can contain arbtrary whitespace. Alignment into the original string
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The tagger and parser are lazy-loaded the first time they are required.
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Loading the parser model usually takes 5-10 seconds.
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Args:
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text (unicode): The text to be processed.
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Keyword args:
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tag (bool): Whether to add part-of-speech tags to the text. Also
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sets morphological analysis and lemmas.
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parse (True, False, -1): Whether to add labelled syntactic dependencies.
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-1 (default) is "guess": It will guess True if tag=True and the
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model has been installed.
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Returns:
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tokens (spacy.tokens.Tokens):
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>>> from spacy.en import English
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>>> nlp = English()
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>>> tokens = nlp('An example sentence. Another example sentence.')
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>>> tokens[0].orth_, tokens[0].head.tag_
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('An', 'NN')
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"""
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if parse == True and tag == False:
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msg = ("Incompatible arguments: tag=False, parse=True"
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"Part-of-speech tags are required for parsing.")
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raise ValueError(msg)
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tokens = self.tokenizer(text)
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if parse == -1 and tag == False:
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parse = False
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elif parse == -1 and not self.has_parser_model:
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parse = False
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if tag and self.has_tagger_model:
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self.tagger(tokens)
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if parse == True and not self.has_parser_model:
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msg = ("Receive parse=True, but parser model not found.\n\n"
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"Run:\n"
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"$ python -m spacy.en.download\n"
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"To install the model.")
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raise IOError(msg)
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if parse and self.has_parser_model:
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self.parser(tokens)
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return tokens
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@property
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def tags(self):
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"""List of part-of-speech tag names."""
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return self.tagger.tag_names
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