mirror of https://github.com/explosion/spaCy.git
216 lines
8.0 KiB
Python
216 lines
8.0 KiB
Python
# coding: utf8
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from __future__ import unicode_literals
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import plac
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import math
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from tqdm import tqdm
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import numpy
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from ast import literal_eval
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from pathlib import Path
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from preshed.counter import PreshCounter
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import tarfile
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import gzip
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import zipfile
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import ujson as json
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from spacy.lexeme import intify_attrs
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from ._messages import Messages
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from ..vectors import Vectors
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from ..errors import Errors, Warnings, user_warning
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from ..util import prints, ensure_path, get_lang_class
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try:
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import ftfy
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except ImportError:
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ftfy = None
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@plac.annotations(
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lang=("model language", "positional", None, str),
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output_dir=("model output directory", "positional", None, Path),
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freqs_loc=("location of words frequencies file", "option", "f", Path),
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jsonl_loc=("location of JSONL-formatted attributes file", "option", "j", Path),
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clusters_loc=("optional: location of brown clusters data",
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"option", "c", str),
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vectors_loc=("optional: location of vectors file in Word2Vec format "
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"(either as .txt or zipped as .zip or .tar.gz)", "option",
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"v", str),
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prune_vectors=("optional: number of vectors to prune to",
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"option", "V", int)
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)
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def init_model(lang, output_dir, freqs_loc=None, clusters_loc=None, jsonl_loc=None,
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vectors_loc=None, prune_vectors=-1):
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"""
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Create a new model from raw data, like word frequencies, Brown clusters
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and word vectors.
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"""
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if jsonl_loc is not None:
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if freqs_loc is not None or clusters_loc is not None:
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settings = ['-j']
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if freqs_loc:
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settings.append('-f')
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if clusters_loc:
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settings.append('-c')
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prints(' '.join(settings),
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title=(
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"The -f and -c arguments are deprecated, and not compatible "
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"with the -j argument, which should specify the same information. "
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"Either merge the frequencies and clusters data into the "
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"jsonl-formatted file (recommended), or use only the -f and "
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"-c files, without the other lexical attributes."))
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jsonl_loc = ensure_path(jsonl_loc)
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lex_attrs = (json.loads(line) for line in jsonl_loc.open())
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else:
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clusters_loc = ensure_path(clusters_loc)
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freqs_loc = ensure_path(freqs_loc)
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if freqs_loc is not None and not freqs_loc.exists():
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prints(freqs_loc, title=Messages.M037, exits=1)
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lex_attrs = read_attrs_from_deprecated(freqs_loc, clusters_loc)
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vectors_loc = ensure_path(vectors_loc)
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if vectors_loc and vectors_loc.parts[-1].endswith('.npz'):
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vector_data = numpy.load(vectors_loc.open('rb'))
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vectors_keys = [lex['orth'] for lex in lex_attrs if 'id' in lex]
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else:
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vectors_data, vector_keys = read_vectors(vectors_loc) if vectors_loc else (None, None)
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nlp = create_model(lang, lex_attrs, vectors_data, vector_keys, prune_vectors)
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if not output_dir.exists():
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output_dir.mkdir()
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nlp.to_disk(output_dir)
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return nlp
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def open_file(loc):
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'''Handle .gz, .tar.gz or unzipped files'''
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loc = ensure_path(loc)
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print("Open loc")
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if tarfile.is_tarfile(str(loc)):
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return tarfile.open(str(loc), 'r:gz')
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elif loc.parts[-1].endswith('gz'):
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return (line.decode('utf8') for line in gzip.open(str(loc), 'r'))
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elif loc.parts[-1].endswith('zip'):
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zip_file = zipfile.ZipFile(str(loc))
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names = zip_file.namelist()
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file_ = zip_file.open(names[0])
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return (line.decode('utf8') for line in file_)
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else:
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return loc.open('r', encoding='utf8')
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def read_attrs_from_deprecated(freqs_loc, clusters_loc):
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probs, oov_prob = read_freqs(freqs_loc) if freqs_loc is not None else ({}, -20)
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clusters = read_clusters(clusters_loc) if clusters_loc else {}
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lex_attrs = {}
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sorted_probs = sorted(probs.items(), key=lambda item: item[1], reverse=True)
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for i, (word, prob) in tqdm(enumerate(sorted_probs)):
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attrs = {'orth': word, 'rank': i, 'prob': prob}
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# Decode as a little-endian string, so that we can do & 15 to get
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# the first 4 bits. See _parse_features.pyx
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if word in clusters:
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attrs['cluster'] = int(clusters[word][::-1], 2)
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else:
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attrs['cluster'] = 0
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lex_attrs.append(attrs)
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return lex_attrs
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def create_model(lang, lex_attrs, vectors_data, vector_keys, prune_vectors):
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print("Creating model...")
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lang_class = get_lang_class(lang)
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nlp = lang_class()
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for lexeme in nlp.vocab:
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lexeme.rank = 0
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lex_added = 0
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for attrs in lex_attrs:
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lexeme = nlp.vocab[attrs['orth']]
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lexeme.set_attrs(**intify_attrs(attrs))
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lexeme.is_oov = False
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lex_added += 1
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lex_added += 1
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oov_prob = min(lex.prob for lex in nlp.vocab)
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nlp.vocab.cfg.update({'oov_prob': oov_prob-1})
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if vector_keys is not None:
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for word in vector_keys:
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if word not in nlp.vocab:
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lexeme = nlp.vocab[word]
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lexeme.is_oov = False
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lex_added += 1
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if vectors_data:
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nlp.vocab.vectors = Vectors(data=vectors_data, keys=vector_keys)
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if prune_vectors >= 1:
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nlp.vocab.prune_vectors(prune_vectors)
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vec_added = len(nlp.vocab.vectors)
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prints(Messages.M039.format(entries=lex_added, vectors=vec_added),
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title=Messages.M038)
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return nlp
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def read_vectors(vectors_loc):
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print("Reading vectors from %s" % vectors_loc)
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f = open_file(vectors_loc)
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shape = tuple(int(size) for size in next(f).split())
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vectors_data = numpy.zeros(shape=shape, dtype='f')
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vectors_keys = []
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for i, line in enumerate(tqdm(f)):
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line = line.rstrip()
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pieces = line.rsplit(' ', vectors_data.shape[1]+1)
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word = pieces.pop(0)
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if len(pieces) != vectors_data.shape[1]:
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raise ValueError(Errors.E094.format(line_num=i, loc=vectors_loc))
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vectors_data[i] = numpy.asarray(pieces, dtype='f')
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vectors_keys.append(word)
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return vectors_data, vectors_keys
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def read_freqs(freqs_loc, max_length=100, min_doc_freq=5, min_freq=50):
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print("Counting frequencies...")
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counts = PreshCounter()
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total = 0
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with freqs_loc.open() as f:
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for i, line in enumerate(f):
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freq, doc_freq, key = line.rstrip().split('\t', 2)
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freq = int(freq)
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counts.inc(i + 1, freq)
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total += freq
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counts.smooth()
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log_total = math.log(total)
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probs = {}
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with freqs_loc.open() as f:
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for line in tqdm(f):
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freq, doc_freq, key = line.rstrip().split('\t', 2)
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doc_freq = int(doc_freq)
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freq = int(freq)
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if doc_freq >= min_doc_freq and freq >= min_freq and len(key) < max_length:
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word = literal_eval(key)
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smooth_count = counts.smoother(int(freq))
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probs[word] = math.log(smooth_count) - log_total
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oov_prob = math.log(counts.smoother(0)) - log_total
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return probs, oov_prob
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def read_clusters(clusters_loc):
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print("Reading clusters...")
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clusters = {}
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if ftfy is None:
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user_warning(Warnings.W004)
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with clusters_loc.open() as f:
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for line in tqdm(f):
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try:
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cluster, word, freq = line.split()
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if ftfy is not None:
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word = ftfy.fix_text(word)
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except ValueError:
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continue
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# If the clusterer has only seen the word a few times, its
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# cluster is unreliable.
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if int(freq) >= 3:
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clusters[word] = cluster
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else:
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clusters[word] = '0'
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# Expand clusters with re-casing
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for word, cluster in list(clusters.items()):
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if word.lower() not in clusters:
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clusters[word.lower()] = cluster
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if word.title() not in clusters:
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clusters[word.title()] = cluster
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if word.upper() not in clusters:
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clusters[word.upper()] = cluster
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return clusters
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