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Tagger label smoothing (#12293)
* add label smoothing * use True/False instead of floats * add entropy to debug data * formatting * docs * change test to check difference in distributions * Update website/docs/api/tagger.mdx Co-authored-by: Adriane Boyd <adrianeboyd@gmail.com> * Update spacy/pipeline/tagger.pyx Co-authored-by: Adriane Boyd <adrianeboyd@gmail.com> * bool -> float * update docs * fix seed * black * update tests to use label_smoothing = 0.0 * set default to 0.0, update quickstart * Update spacy/pipeline/tagger.pyx Co-authored-by: Adriane Boyd <adrianeboyd@gmail.com> * update morphologizer, tagger test * fix morph docs * add url to docs --------- Co-authored-by: Adriane Boyd <adrianeboyd@gmail.com>
This commit is contained in:
Vinit Ravishankar
GitHub
parent
b479f8bfa5
commit
28de85737f
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@ -7,6 +7,7 @@ import srsly
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from wasabi import Printer, MESSAGES, msg
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import typer
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import math
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import numpy
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from ._util import app, Arg, Opt, show_validation_error, parse_config_overrides
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from ._util import import_code, debug_cli, _format_number
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@ -521,9 +522,13 @@ def debug_data(
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if "tagger" in factory_names:
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msg.divider("Part-of-speech Tagging")
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label_list = [label for label in gold_train_data["tags"]]
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model_labels = _get_labels_from_model(nlp, "tagger")
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label_list, counts = zip(*gold_train_data["tags"].items())
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msg.info(f"{len(label_list)} label(s) in train data")
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p = numpy.array(counts)
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p = p / p.sum()
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norm_entropy = (-p * numpy.log2(p)).sum() / numpy.log2(len(label_list))
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msg.info(f"{norm_entropy} is the normalised label entropy")
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model_labels = _get_labels_from_model(nlp, "tagger")
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labels = set(label_list)
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missing_labels = model_labels - labels
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if missing_labels:
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@ -331,6 +331,7 @@ maxout_pieces = 3
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{% if "morphologizer" in components %}
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[components.morphologizer]
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factory = "morphologizer"
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label_smoothing = 0.05
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[components.morphologizer.model]
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@architectures = "spacy.Tagger.v2"
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@ -344,6 +345,7 @@ width = ${components.tok2vec.model.encode.width}
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{% if "tagger" in components %}
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[components.tagger]
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factory = "tagger"
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label_smoothing = 0.05
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[components.tagger.model]
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@architectures = "spacy.Tagger.v2"
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@ -52,7 +52,8 @@ DEFAULT_MORPH_MODEL = Config().from_str(default_model_config)["model"]
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@Language.factory(
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"morphologizer",
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assigns=["token.morph", "token.pos"],
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default_config={"model": DEFAULT_MORPH_MODEL, "overwrite": True, "extend": False, "scorer": {"@scorers": "spacy.morphologizer_scorer.v1"}},
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default_config={"model": DEFAULT_MORPH_MODEL, "overwrite": True, "extend": False,
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"scorer": {"@scorers": "spacy.morphologizer_scorer.v1"}, "label_smoothing": 0.0},
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default_score_weights={"pos_acc": 0.5, "morph_acc": 0.5, "morph_per_feat": None},
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)
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def make_morphologizer(
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@ -61,9 +62,10 @@ def make_morphologizer(
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name: str,
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overwrite: bool,
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extend: bool,
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label_smoothing: float,
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scorer: Optional[Callable],
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):
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return Morphologizer(nlp.vocab, model, name, overwrite=overwrite, extend=extend, scorer=scorer)
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return Morphologizer(nlp.vocab, model, name, overwrite=overwrite, extend=extend, label_smoothing=label_smoothing, scorer=scorer)
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def morphologizer_score(examples, **kwargs):
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@ -94,6 +96,7 @@ class Morphologizer(Tagger):
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*,
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overwrite: bool = BACKWARD_OVERWRITE,
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extend: bool = BACKWARD_EXTEND,
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label_smoothing: float = 0.0,
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scorer: Optional[Callable] = morphologizer_score,
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):
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"""Initialize a morphologizer.
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@ -121,6 +124,7 @@ class Morphologizer(Tagger):
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"labels_pos": {},
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"overwrite": overwrite,
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"extend": extend,
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"label_smoothing": label_smoothing,
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}
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self.cfg = dict(sorted(cfg.items()))
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self.scorer = scorer
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@ -270,7 +274,8 @@ class Morphologizer(Tagger):
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DOCS: https://spacy.io/api/morphologizer#get_loss
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"""
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validate_examples(examples, "Morphologizer.get_loss")
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loss_func = SequenceCategoricalCrossentropy(names=self.labels, normalize=False)
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loss_func = SequenceCategoricalCrossentropy(names=self.labels, normalize=False,
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label_smoothing=self.cfg["label_smoothing"])
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truths = []
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for eg in examples:
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eg_truths = []
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@ -45,7 +45,7 @@ DEFAULT_TAGGER_MODEL = Config().from_str(default_model_config)["model"]
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@Language.factory(
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"tagger",
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assigns=["token.tag"],
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default_config={"model": DEFAULT_TAGGER_MODEL, "overwrite": False, "scorer": {"@scorers": "spacy.tagger_scorer.v1"}, "neg_prefix": "!"},
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default_config={"model": DEFAULT_TAGGER_MODEL, "overwrite": False, "scorer": {"@scorers": "spacy.tagger_scorer.v1"}, "neg_prefix": "!", "label_smoothing": 0.0},
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default_score_weights={"tag_acc": 1.0},
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)
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def make_tagger(
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@ -55,6 +55,7 @@ def make_tagger(
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overwrite: bool,
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scorer: Optional[Callable],
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neg_prefix: str,
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label_smoothing: float,
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):
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"""Construct a part-of-speech tagger component.
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@ -63,7 +64,7 @@ def make_tagger(
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in size, and be normalized as probabilities (all scores between 0 and 1,
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with the rows summing to 1).
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"""
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return Tagger(nlp.vocab, model, name, overwrite=overwrite, scorer=scorer, neg_prefix=neg_prefix)
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return Tagger(nlp.vocab, model, name, overwrite=overwrite, scorer=scorer, neg_prefix=neg_prefix, label_smoothing=label_smoothing)
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def tagger_score(examples, **kwargs):
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@ -89,6 +90,7 @@ class Tagger(TrainablePipe):
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overwrite=BACKWARD_OVERWRITE,
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scorer=tagger_score,
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neg_prefix="!",
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label_smoothing=0.0,
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):
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"""Initialize a part-of-speech tagger.
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@ -105,7 +107,7 @@ class Tagger(TrainablePipe):
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self.model = model
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self.name = name
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self._rehearsal_model = None
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cfg = {"labels": [], "overwrite": overwrite, "neg_prefix": neg_prefix}
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cfg = {"labels": [], "overwrite": overwrite, "neg_prefix": neg_prefix, "label_smoothing": label_smoothing}
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self.cfg = dict(sorted(cfg.items()))
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self.scorer = scorer
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@ -256,7 +258,7 @@ class Tagger(TrainablePipe):
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DOCS: https://spacy.io/api/tagger#get_loss
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"""
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validate_examples(examples, "Tagger.get_loss")
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loss_func = SequenceCategoricalCrossentropy(names=self.labels, normalize=False, neg_prefix=self.cfg["neg_prefix"])
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loss_func = SequenceCategoricalCrossentropy(names=self.labels, normalize=False, neg_prefix=self.cfg["neg_prefix"], label_smoothing=self.cfg["label_smoothing"])
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# Convert empty tag "" to missing value None so that both misaligned
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# tokens and tokens with missing annotation have the default missing
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# value None.
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@ -1,5 +1,5 @@
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import pytest
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from numpy.testing import assert_equal
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from numpy.testing import assert_equal, assert_almost_equal
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from spacy import util
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from spacy.training import Example
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@ -19,6 +19,8 @@ def test_label_types():
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morphologizer.add_label(9)
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TAGS = ["Feat=N", "Feat=V", "Feat=J"]
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TRAIN_DATA = [
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(
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"I like green eggs",
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@ -32,6 +34,29 @@ TRAIN_DATA = [
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]
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def test_label_smoothing():
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nlp = Language()
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morph_no_ls = nlp.add_pipe("morphologizer", "no_label_smoothing")
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morph_ls = nlp.add_pipe(
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"morphologizer", "label_smoothing", config=dict(label_smoothing=0.05)
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)
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train_examples = []
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losses = {}
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for tag in TAGS:
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morph_no_ls.add_label(tag)
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morph_ls.add_label(tag)
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for t in TRAIN_DATA:
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train_examples.append(Example.from_dict(nlp.make_doc(t[0]), t[1]))
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nlp.initialize(get_examples=lambda: train_examples)
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tag_scores, bp_tag_scores = morph_ls.model.begin_update(
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[eg.predicted for eg in train_examples]
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)
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no_ls_grads = morph_no_ls.get_loss(train_examples, tag_scores)[1][0]
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ls_grads = morph_ls.get_loss(train_examples, tag_scores)[1][0]
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assert_almost_equal(ls_grads / no_ls_grads, 0.94285715)
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def test_no_label():
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nlp = Language()
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nlp.add_pipe("morphologizer")
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@ -1,5 +1,5 @@
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import pytest
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from numpy.testing import assert_equal
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from numpy.testing import assert_equal, assert_almost_equal
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from spacy.attrs import TAG
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from spacy import util
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@ -67,6 +67,29 @@ PARTIAL_DATA = [
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]
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def test_label_smoothing():
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nlp = Language()
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tagger_no_ls = nlp.add_pipe("tagger", "no_label_smoothing")
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tagger_ls = nlp.add_pipe(
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"tagger", "label_smoothing", config=dict(label_smoothing=0.05)
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)
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train_examples = []
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losses = {}
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for tag in TAGS:
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tagger_no_ls.add_label(tag)
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tagger_ls.add_label(tag)
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for t in TRAIN_DATA:
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train_examples.append(Example.from_dict(nlp.make_doc(t[0]), t[1]))
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nlp.initialize(get_examples=lambda: train_examples)
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tag_scores, bp_tag_scores = tagger_ls.model.begin_update(
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[eg.predicted for eg in train_examples]
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)
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no_ls_grads = tagger_no_ls.get_loss(train_examples, tag_scores)[1][0]
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ls_grads = tagger_ls.get_loss(train_examples, tag_scores)[1][0]
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assert_almost_equal(ls_grads / no_ls_grads, 0.925)
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def test_no_label():
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nlp = Language()
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nlp.add_pipe("tagger")
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@ -43,11 +43,12 @@ architectures and their arguments and hyperparameters.
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> ```
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| Setting | Description |
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| ---------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| ---------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `model` | The model to use. Defaults to [Tagger](/api/architectures#Tagger). ~~Model[List[Doc], List[Floats2d]]~~ |
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| `overwrite` <Tag variant="new">3.2</Tag> | Whether the values of existing features are overwritten. Defaults to `True`. ~~bool~~ |
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| `extend` <Tag variant="new">3.2</Tag> | Whether existing feature types (whose values may or may not be overwritten depending on `overwrite`) are preserved. Defaults to `False`. ~~bool~~ |
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| `scorer` <Tag variant="new">3.2</Tag> | The scoring method. Defaults to [`Scorer.score_token_attr`](/api/scorer#score_token_attr) for the attributes `"pos"` and `"morph"` and [`Scorer.score_token_attr_per_feat`](/api/scorer#score_token_attr_per_feat) for the attribute `"morph"`. ~~Optional[Callable]~~ |
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| `label_smoothing` <Tag variant="new">3.6</Tag> | [Label smoothing](https://arxiv.org/abs/1906.02629) factor. Defaults to `0.0`. ~~float~~ |
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```python
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%%GITHUB_SPACY/spacy/pipeline/morphologizer.pyx
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@ -41,11 +41,12 @@ architectures and their arguments and hyperparameters.
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> ```
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| Setting | Description |
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| ------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| ---------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `model` | A model instance that predicts the tag probabilities. The output vectors should match the number of tags in size, and be normalized as probabilities (all scores between 0 and 1, with the rows summing to `1`). Defaults to [Tagger](/api/architectures#Tagger). ~~Model[List[Doc], List[Floats2d]]~~ |
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| `overwrite` <Tag variant="new">3.2</Tag> | Whether existing annotation is overwritten. Defaults to `False`. ~~bool~~ |
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| `scorer` <Tag variant="new">3.2</Tag> | The scoring method. Defaults to [`Scorer.score_token_attr`](/api/scorer#score_token_attr) for the attribute `"tag"`. ~~Optional[Callable]~~ |
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| `neg_prefix` <Tag variant="new">3.2.1</Tag> | The prefix used to specify incorrect tags while training. The tagger will learn not to predict exactly this tag. Defaults to `!`. ~~str~~ |
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| `label_smoothing` <Tag variant="new">3.6</Tag> | [Label smoothing](https://arxiv.org/abs/1906.02629) factor. Defaults to `0.0`. ~~float~~ |
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```python
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%%GITHUB_SPACY/spacy/pipeline/tagger.pyx
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