mirror of
https://github.com/explosion/spaCy.git
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84 lines
3.0 KiB
Python
84 lines
3.0 KiB
Python
# coding: utf8
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from __future__ import absolute_import, unicode_literals
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import random
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import tqdm
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from .gold import GoldParse, merge_sents
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from .scorer import Scorer
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class Trainer(object):
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"""
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Manage training of an NLP pipeline.
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"""
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def __init__(self, nlp, gold_tuples):
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self.nlp = nlp
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self.gold_tuples = gold_tuples
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self.nr_epoch = 0
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def epochs(self, nr_epoch, augment_data=None, gold_preproc=False):
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cached_golds = {}
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def _epoch(indices):
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for i in tqdm.tqdm(indices):
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raw_text, paragraph_tuples = self.gold_tuples[i]
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if gold_preproc:
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raw_text = None
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else:
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paragraph_tuples = merge_sents(paragraph_tuples)
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if augment_data is None:
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docs = self.make_docs(raw_text, paragraph_tuples)
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if i in cached_golds:
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golds = cached_golds[i]
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else:
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golds = self.make_golds(docs, paragraph_tuples)
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else:
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raw_text, paragraph_tuples = augment_data(raw_text, paragraph_tuples)
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docs = self.make_docs(raw_text, paragraph_tuples)
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golds = self.make_golds(docs, paragraph_tuples)
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for doc, gold in zip(docs, golds):
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yield doc, gold
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indices = list(range(len(self.gold_tuples)))
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for itn in range(nr_epoch):
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random.shuffle(indices)
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yield _epoch(indices)
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self.nr_epoch += 1
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def update(self, doc, gold):
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for process in self.nlp.pipeline:
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if hasattr(process, 'update'):
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loss = process.update(doc, gold, itn=self.nr_epoch)
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else:
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process(doc)
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return doc
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def evaluate(self, dev_sents, gold_preproc=False):
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scorer = Scorer()
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for raw_text, paragraph_tuples in dev_sents:
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if gold_preproc:
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raw_text = None
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else:
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paragraph_tuples = merge_sents(paragraph_tuples)
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docs = self.make_docs(raw_text, paragraph_tuples)
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golds = self.make_golds(docs, paragraph_tuples)
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for doc, gold in zip(docs, golds):
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for process in self.nlp.pipeline:
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process(doc)
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scorer.score(doc, gold)
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return scorer
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def make_docs(self, raw_text, paragraph_tuples):
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if raw_text is not None:
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return [self.nlp.tokenizer(raw_text)]
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else:
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return [self.nlp.tokenizer.tokens_from_list(sent_tuples[0][1])
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for sent_tuples in paragraph_tuples]
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def make_golds(self, docs, paragraph_tuples):
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if len(docs) == 1:
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return [GoldParse.from_annot_tuples(docs[0], sent_tuples[0])
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for sent_tuples in paragraph_tuples]
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else:
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return [GoldParse.from_annot_tuples(doc, sent_tuples[0])
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for doc, sent_tuples in zip(docs, paragraph_tuples)]
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