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113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
#!/usr/bin/env python
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# coding: utf8
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"""
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Example of training spaCy dependency parser, starting off with an existing model
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or a blank model.
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For more details, see the documentation:
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* Training: https://alpha.spacy.io/usage/training
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* Dependency Parse: https://alpha.spacy.io/usage/linguistic-features#dependency-parse
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Developed for: spaCy 2.0.0a18
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Last updated for: spaCy 2.0.0a18
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"""
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from __future__ import unicode_literals, print_function
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import random
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from pathlib import Path
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import spacy
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from spacy.gold import GoldParse
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from spacy.tokens import Doc
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# training data
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TRAIN_DATA = [
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(
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['They', 'trade', 'mortgage', '-', 'backed', 'securities', '.'],
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[1, 1, 4, 4, 5, 1, 1],
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['nsubj', 'ROOT', 'compound', 'punct', 'nmod', 'dobj', 'punct']
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),
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(
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['I', 'like', 'London', 'and', 'Berlin', '.'],
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[1, 1, 1, 2, 2, 1],
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['nsubj', 'ROOT', 'dobj', 'cc', 'conj', 'punct']
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)
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]
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def main(model=None, output_dir=None, n_iter=1000):
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"""Load the model, set up the pipeline and train the parser.
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model (unicode): Model name to start off with. If None, a blank English
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Language class is created.
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output_dir (unicode / Path): Optional output directory. If None, no model
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will be saved.
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n_iter (int): Number of iterations during training.
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"""
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if model is not None:
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nlp = spacy.load(model) # load existing spaCy model
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print("Loaded model '%s'" % model)
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else:
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nlp = spacy.blank('en') # create blank Language class
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print("Created blank 'en' model")
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# add the parser to the pipeline if it doesn't exist
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# nlp.create_pipe works for built-ins that are registered with spaCy
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if 'parser' not in nlp.pipe_names:
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parser = nlp.create_pipe('parser')
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nlp.add_pipe(parser, first=True)
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# otherwise, get it, so we can add labels to it
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else:
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parser = nlp.get_pipe('parser')
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# add labels to the parser
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for _, heads, deps in TRAIN_DATA:
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for dep in deps:
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parser.add_label(dep)
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# get names of other pipes to disable them during training
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other_pipes = [pipe for pipe in nlp.pipe_names if pipe != 'parser']
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with nlp.disable_pipes(*other_pipes) as disabled: # only train parser
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optimizer = nlp.begin_training(lambda: [])
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for itn in range(n_iter):
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random.shuffle(TRAIN_DATA)
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losses = {}
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for words, heads, deps in TRAIN_DATA:
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doc = Doc(nlp.vocab, words=words)
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gold = GoldParse(doc, heads=heads, deps=deps)
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nlp.update([doc], [gold], sgd=optimizer, losses=losses)
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print(losses)
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# test the trained model
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test_text = "I like securities."
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doc = nlp(test_text)
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print('Dependencies', [(t.text, t.dep_, t.head.text) for t in doc])
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# save model to output directory
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if output_dir is not None:
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output_dir = Path(output_dir)
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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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print("Saved model to", output_dir)
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# test the save model
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print("Loading from", output_dir)
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nlp2 = spacy.load(output_dir)
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doc = nlp2(test_text)
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print('Dependencies', [(t.text, t.dep_, t.head.text) for t in doc])
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if __name__ == '__main__':
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import plac
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plac.call(main)
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# expected result:
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# [
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# ('I', 'nsubj', 'like'),
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# ('like', 'ROOT', 'like'),
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# ('securities', 'dobj', 'like'),
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# ('.', 'punct', 'like')
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# ]
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