spaCy/spacy/train.py
2017-03-14 21:28:43 +01:00

84 lines
3.1 KiB
Python

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