mirror of
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111 lines
3.4 KiB
Cython
111 lines
3.4 KiB
Cython
# cython: profile=True
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from __future__ import unicode_literals
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from __future__ import division
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from os import path
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import os
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import shutil
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import random
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import json
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import cython
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from thinc.features cimport Feature, count_feats
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def setup_model_dir(tag_names, tag_map, tag_counts, templates, model_dir):
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if path.exists(model_dir):
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shutil.rmtree(model_dir)
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os.mkdir(model_dir)
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config = {
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'templates': templates,
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'tag_names': tag_names,
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'tag_map': tag_map,
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'tag_counts': tag_counts,
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}
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with open(path.join(model_dir, 'config.json'), 'w') as file_:
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json.dump(config, file_)
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cdef class Tagger:
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"""Predict some type of tag, using greedy decoding. The tagger reads its
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model and configuration from disk.
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"""
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def __init__(self, model_dir):
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self.mem = Pool()
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cfg = json.load(open(path.join(model_dir, 'config.json')))
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templates = cfg['templates']
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univ_counts = {}
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cdef unicode tag
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cdef unicode univ_tag
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self.tag_names = cfg['tag_names']
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self.tagdict = _make_tag_dict(cfg['tag_counts'])
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self.extractor = Extractor(templates)
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self.model = LinearModel(len(self.tag_names), self.extractor.n_templ+2)
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if path.exists(path.join(model_dir, 'model')):
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self.model.load(path.join(model_dir, 'model'))
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cdef class_t predict(self, atom_t* context, object golds=None) except *:
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"""Predict the tag of tokens[i].
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>>> tokens = EN.tokenize(u'An example sentence.')
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>>> tag = EN.pos_tagger.predict(0, tokens)
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>>> assert tag == EN.pos_tagger.tag_id('DT') == 5
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"""
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cdef int n_feats
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cdef Feature* feats = self.extractor.get_feats(context, &n_feats)
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cdef weight_t* scores = self.model.get_scores(feats, n_feats)
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guess = _arg_max(scores, self.model.nr_class)
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if golds is not None and guess not in golds:
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best = _arg_max_among(scores, golds)
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counts = {guess: {}, best: {}}
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count_feats(counts[guess], feats, n_feats, -1)
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count_feats(counts[best], feats, n_feats, 1)
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self.model.update(counts)
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return guess
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def tag_id(self, object tag_name):
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"""Encode tag_name into a tag ID integer."""
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tag_id = self.tag_names.index(tag_name)
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if tag_id == -1:
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tag_id = len(self.tag_names)
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self.tag_names.append(tag_name)
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return tag_id
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def _make_tag_dict(counts):
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freq_thresh = 20
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ambiguity_thresh = 0.97
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tagdict = {}
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cdef atom_t word
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cdef atom_t tag
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for word_str, tag_freqs in counts.items():
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tag_str, mode = max(tag_freqs.items(), key=lambda item: item[1])
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n = sum(tag_freqs.values())
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word = int(word_str)
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tag = int(tag_str)
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if n >= freq_thresh and (float(mode) / n) >= ambiguity_thresh:
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tagdict[word] = tag
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return tagdict
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cdef int _arg_max(weight_t* scores, int n_classes) except -1:
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cdef int best = 0
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cdef weight_t score = scores[best]
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cdef int i
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for i in range(1, n_classes):
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if scores[i] >= score:
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score = scores[i]
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best = i
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return best
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cdef int _arg_max_among(weight_t* scores, list classes) except -1:
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cdef int best = classes[0]
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cdef weight_t score = scores[best]
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cdef class_t clas
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for clas in classes:
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if scores[clas] > score:
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score = scores[clas]
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best = clas
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return best
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