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Code Issues Packages Projects Releases Wiki Activity

Create corpus iterator and batcher from registry during training (#5865)

Browse Source 
* Move batchers into their own module (and registry)

* Update CLI

* Update Corpus and batcher

* Update tests

* Update one config

* Merge 'evaluation' block back under [training]

* Import batchers in gold __init__

* Fix batchers

* Update config

* Update schema

* Update util

* Don't assume train and dev are actually paths

* Update onto-joint config

* Fix missing import

* Format

* Format

* Update spacy/gold/corpus.py

Co-authored-by: Ines Montani <ines@ines.io>

* Fix name

* Update default config

* Fix get_length option in batchers

* Update test

* Add comment

* Pass path into Corpus

* Update docstring

* Update schema and configs

* Update config

* Fix test

* Fix paths

* Fix print

* Fix create_train_batches

* [training.read_train] -> [training.train_corpus]

* Update onto-joint config

Co-authored-by: Ines Montani <ines@ines.io>
This commit is contained in:
Matthew Honnibal 2020-08-04 15:09:37 +02:00 committed by GitHub
parent 82347110f5
commit ecb3c4e8f4
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16 changed files with 454 additions and 439 deletions
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72
examples/experiments/onto-joint/defaults.cfg
View File

@ -1,37 +1,45 @@
# Training hyper-parameters and additional features. [paths]
[training] train = ""
# Whether to train on sequences with 'gold standard' sentence boundaries dev = ""
# and tokens. If you set this to true, take care to ensure your run-time raw = null
# data is passed in sentence-by-sentence via some prior preprocessing.
gold_preproc = false
# Limitations on training document length or number of examples.
max_length = 5000
limit = 0
# Data augmentation
orth_variant_level = 0.0
dropout = 0.1
# Controls early-stopping. 0 or -1 mean unlimited.
patience = 1600
max_epochs = 0
max_steps = 20000
eval_frequency = 200
# Other settings
seed = 0
accumulate_gradient = 1
use_pytorch_for_gpu_memory = false
# Control how scores are printed and checkpoints are evaluated.
eval_batch_size = 128
score_weights = {"dep_las": 0.4, "ents_f": 0.4, "tag_acc": 0.2}
init_tok2vec = null init_tok2vec = null
discard_oversize = false
batch_by = "words"
raw_text = null
tag_map = null
vectors = null
base_model = null
morph_rules = null
[training.batch_size] [system]
seed = 0
use_pytorch_for_gpu_memory = false
[training]
seed = ${system:seed}
dropout = 0.1
init_tok2vec = ${paths:init_tok2vec}
vectors = null
accumulate_gradient = 1
max_steps = 0
max_epochs = 0
patience = 10000
eval_frequency = 200
score_weights = {"dep_las": 0.4, "ents_f": 0.4, "tag_acc": 0.2}
[training.train_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:train}
gold_preproc = true
max_length = 0
limit = 0
[training.dev_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:dev}
gold_preproc = ${training.read_train:gold_preproc}
max_length = 0
limit = 0
[training.batcher]
@batchers = "batch_by_words.v1"
discard_oversize = false
tolerance = 0.2
[training.batcher.size]
@schedules = "compounding.v1" @schedules = "compounding.v1"
start = 100 start = 100
stop = 1000 stop = 1000

51
examples/experiments/ptb-joint-pos-dep/defaults.cfg
View File

@ -1,30 +1,45 @@
[paths]
train = ""
dev = ""
raw = null
init_tok2vec = null
[system]
seed = 0
use_pytorch_for_gpu_memory = false
[training] [training]
seed = ${system:seed}
dropout = 0.2
init_tok2vec = ${paths:init_tok2vec}
vectors = null
accumulate_gradient = 1
max_steps = 0 max_steps = 0
max_epochs = 0
patience = 10000 patience = 10000
eval_frequency = 200 eval_frequency = 200
dropout = 0.2 score_weights = {"dep_las": 0.8, "tag_acc": 0.2}
init_tok2vec = null
vectors = null [training.read_train]
max_epochs = 100 @readers = "spacy.Corpus.v1"
orth_variant_level = 0.0 path = ${paths:train}
gold_preproc = true gold_preproc = true
max_length = 0 max_length = 0
scores = ["tag_acc", "dep_uas", "dep_las", "speed"]
score_weights = {"dep_las": 0.8, "tag_acc": 0.2}
limit = 0 limit = 0
seed = 0
accumulate_gradient = 1 [training.read_dev]
@readers = "spacy.Corpus.v1"
path = ${paths:dev}
gold_preproc = ${training.read_train:gold_preproc}
max_length = 0
limit = 0
[training.batcher]
@batchers = "batch_by_words.v1"
discard_oversize = false discard_oversize = false
raw_text = null tolerance = 0.2
tag_map = null
morph_rules = null
base_model = null
eval_batch_size = 128 [training.batcher.size]
use_pytorch_for_gpu_memory = false
batch_by = "words"
[training.batch_size]
@schedules = "compounding.v1" @schedules = "compounding.v1"
start = 100 start = 100
stop = 1000 stop = 1000

5
spacy/cli/debug_data.py
View File

@ -162,13 +162,12 @@ def debug_data(
loading_train_error_message = "" loading_train_error_message = ""
loading_dev_error_message = "" loading_dev_error_message = ""
with msg.loading("Loading corpus..."): with msg.loading("Loading corpus..."):
corpus = Corpus(train_path, dev_path)
try: try:
train_dataset = list(corpus.train_dataset(nlp)) train_dataset = list(Corpus(train_path)(nlp))
except ValueError as e: except ValueError as e:
loading_train_error_message = f"Training data cannot be loaded: {e}" loading_train_error_message = f"Training data cannot be loaded: {e}"
try: try:
dev_dataset = list(corpus.dev_dataset(nlp)) dev_dataset = list(Corpus(dev_path)(nlp))
except ValueError as e: except ValueError as e:
loading_dev_error_message = f"Development data cannot be loaded: {e}" loading_dev_error_message = f"Development data cannot be loaded: {e}"
if loading_train_error_message or loading_dev_error_message: if loading_train_error_message or loading_dev_error_message:

4
spacy/cli/evaluate.py
View File

@ -64,9 +64,9 @@ def evaluate(
msg.fail("Evaluation data not found", data_path, exits=1) msg.fail("Evaluation data not found", data_path, exits=1)
if displacy_path and not displacy_path.exists(): if displacy_path and not displacy_path.exists():
msg.fail("Visualization output directory not found", displacy_path, exits=1) msg.fail("Visualization output directory not found", displacy_path, exits=1)
corpus = Corpus(data_path, data_path) corpus = Corpus(data_path, gold_preproc=gold_preproc)
nlp = util.load_model(model) nlp = util.load_model(model)
dev_dataset = list(corpus.dev_dataset(nlp, gold_preproc=gold_preproc)) dev_dataset = list(corpus(nlp))
scores = nlp.evaluate(dev_dataset, verbose=False) scores = nlp.evaluate(dev_dataset, verbose=False)
metrics = { metrics = {
"TOK": "token_acc", "TOK": "token_acc",

160
spacy/cli/train.py
View File

@ -12,9 +12,9 @@ import typer
from ._util import app, Arg, Opt, parse_config_overrides, show_validation_error from ._util import app, Arg, Opt, parse_config_overrides, show_validation_error
from ._util import import_code from ._util import import_code
from ..gold import Corpus, Example
from ..language import Language from ..language import Language
from .. import util from .. import util
from ..gold.example import Example
from ..errors import Errors from ..errors import Errors
@ -28,8 +28,6 @@ from ..ml import models # noqa: F401
def train_cli( def train_cli(
# fmt: off # fmt: off
ctx: typer.Context, # This is only used to read additional arguments ctx: typer.Context, # This is only used to read additional arguments
train_path: Path = Arg(..., help="Location of training data", exists=True),
dev_path: Path = Arg(..., help="Location of development data", exists=True),
config_path: Path = Arg(..., help="Path to config file", exists=True), config_path: Path = Arg(..., help="Path to config file", exists=True),
output_path: Optional[Path] = Opt(None, "--output", "--output-path", "-o", help="Output directory to store model in"), output_path: Optional[Path] = Opt(None, "--output", "--output-path", "-o", help="Output directory to store model in"),
code_path: Optional[Path] = Opt(None, "--code-path", "-c", help="Path to Python file with additional code (registered functions) to be imported"), code_path: Optional[Path] = Opt(None, "--code-path", "-c", help="Path to Python file with additional code (registered functions) to be imported"),
@ -51,12 +49,11 @@ def train_cli(
referenced in the config. referenced in the config.
""" """
util.set_env_log(verbose) util.set_env_log(verbose)
verify_cli_args(train_path, dev_path, config_path, output_path) verify_cli_args(config_path, output_path)
overrides = parse_config_overrides(ctx.args) overrides = parse_config_overrides(ctx.args)
import_code(code_path) import_code(code_path)
train( train(
config_path, config_path,
{"train": train_path, "dev": dev_path},
output_path=output_path, output_path=output_path,
config_overrides=overrides, config_overrides=overrides,
use_gpu=use_gpu, use_gpu=use_gpu,
@ -66,8 +63,6 @@ def train_cli(
def train( def train(
config_path: Path, config_path: Path,
data_paths: Dict[str, Path],
raw_text: Optional[Path] = None,
output_path: Optional[Path] = None, output_path: Optional[Path] = None,
config_overrides: Dict[str, Any] = {}, config_overrides: Dict[str, Any] = {},
use_gpu: int = -1, use_gpu: int = -1,
@ -85,36 +80,24 @@ def train(
fix_random_seed(config["training"]["seed"]) fix_random_seed(config["training"]["seed"])
with show_validation_error(config_path): with show_validation_error(config_path):
nlp, config = util.load_model_from_config(config, overrides=config_overrides) nlp, config = util.load_model_from_config(config, overrides=config_overrides)
if config["training"]["base_model"]:
# TODO: do something to check base_nlp against regular nlp described in config?
# If everything matches it will look something like:
# base_nlp = util.load_model(config["training"]["base_model"])
# nlp = base_nlp
raise NotImplementedError("base_model not supported yet.")
if config["training"]["vectors"] is not None: if config["training"]["vectors"] is not None:
util.load_vectors_into_model(nlp, config["training"]["vectors"]) util.load_vectors_into_model(nlp, config["training"]["vectors"])
verify_config(nlp) verify_config(nlp)
raw_text, tag_map, morph_rules, weights_data = load_from_paths(config) raw_text, tag_map, morph_rules, weights_data = load_from_paths(config)
if config["training"]["use_pytorch_for_gpu_memory"]: if config.get("system", {}).get("use_pytorch_for_gpu_memory"):
# It feels kind of weird to not have a default for this. # It feels kind of weird to not have a default for this.
use_pytorch_for_gpu_memory() use_pytorch_for_gpu_memory()
training = config["training"] T_cfg = config["training"]
optimizer = training["optimizer"] optimizer = T_cfg["optimizer"]
limit = training["limit"] train_corpus = T_cfg["train_corpus"]
corpus = Corpus(data_paths["train"], data_paths["dev"], limit=limit) dev_corpus = T_cfg["dev_corpus"]
batcher = T_cfg["batcher"]
if resume_training: if resume_training:
msg.info("Resuming training") msg.info("Resuming training")
nlp.resume_training() nlp.resume_training()
else: else:
msg.info(f"Initializing the nlp pipeline: {nlp.pipe_names}") msg.info(f"Initializing the nlp pipeline: {nlp.pipe_names}")
train_examples = corpus.train_dataset( nlp.begin_training(lambda: train_corpus(nlp))
nlp,
shuffle=False,
gold_preproc=training["gold_preproc"],
max_length=training["max_length"],
)
train_examples = list(train_examples)
nlp.begin_training(lambda: train_examples)
if tag_map: if tag_map:
# Replace tag map with provided mapping # Replace tag map with provided mapping
@ -140,38 +123,35 @@ def train(
msg.fail(err, exits=1) msg.fail(err, exits=1)
tok2vec.from_bytes(weights_data) tok2vec.from_bytes(weights_data)
msg.info("Loading training corpus")
train_batches = create_train_batches(nlp, corpus, training)
evaluate = create_evaluation_callback(nlp, optimizer, corpus, training)
# Create iterator, which yields out info after each optimization step. # Create iterator, which yields out info after each optimization step.
msg.info("Start training") msg.info("Start training")
score_weights = T_cfg["score_weights"]
training_step_iterator = train_while_improving( training_step_iterator = train_while_improving(
nlp, nlp,
optimizer, optimizer,
train_batches, create_train_batches(train_corpus(nlp), batcher, T_cfg["max_epochs"]),
evaluate, create_evaluation_callback(nlp, dev_corpus, score_weights),
dropout=training["dropout"], dropout=T_cfg["dropout"],
accumulate_gradient=training["accumulate_gradient"], accumulate_gradient=T_cfg["accumulate_gradient"],
patience=training["patience"], patience=T_cfg["patience"],
max_steps=training["max_steps"], max_steps=T_cfg["max_steps"],
eval_frequency=training["eval_frequency"], eval_frequency=T_cfg["eval_frequency"],
raw_text=raw_text, raw_text=None
) )
msg.info(f"Training. Initial learn rate: {optimizer.learn_rate}") msg.info(f"Training. Initial learn rate: {optimizer.learn_rate}")
print_row = setup_printer(training, nlp) print_row = setup_printer(T_cfg, nlp)
try: try:
progress = tqdm.tqdm(total=training["eval_frequency"], leave=False) progress = tqdm.tqdm(total=T_cfg["eval_frequency"], leave=False)
for batch, info, is_best_checkpoint in training_step_iterator: for batch, info, is_best_checkpoint in training_step_iterator:
progress.update(1) progress.update(1)
if is_best_checkpoint is not None: if is_best_checkpoint is not None:
progress.close() progress.close()
print_row(info) print_row(info)
if is_best_checkpoint and output_path is not None: if is_best_checkpoint and output_path is not None:
update_meta(training, nlp, info) update_meta(T_cfg, nlp, info)
nlp.to_disk(output_path / "model-best") nlp.to_disk(output_path / "model-best")
progress = tqdm.tqdm(total=training["eval_frequency"], leave=False) progress = tqdm.tqdm(total=T_cfg["eval_frequency"], leave=False)
except Exception as e: except Exception as e:
if output_path is not None: if output_path is not None:
msg.warn( msg.warn(
@ -192,70 +172,34 @@ def train(
msg.good(f"Saved model to output directory {final_model_path}") msg.good(f"Saved model to output directory {final_model_path}")
def create_train_batches( def create_train_batches(iterator, batcher, max_epochs: int):
nlp: Language, corpus: Corpus, cfg: Union[Config, Dict[str, Any]] epoch = 1
): examples = []
max_epochs = cfg["max_epochs"] # Stream the first epoch, so we start training faster and support
train_examples = list( # infinite streams.
corpus.train_dataset( for batch in batcher(iterator):
nlp,
shuffle=True,
gold_preproc=cfg["gold_preproc"],
max_length=cfg["max_length"],
)
)
epoch = 0
batch_strategy = cfg["batch_by"]
while True:
if len(train_examples) == 0:
raise ValueError(Errors.E988)
epoch += 1
if batch_strategy == "padded":
batches = util.minibatch_by_padded_size(
train_examples,
size=cfg["batch_size"],
buffer=256,
discard_oversize=cfg["discard_oversize"],
)
elif batch_strategy == "words":
batches = util.minibatch_by_words(
train_examples,
size=cfg["batch_size"],
discard_oversize=cfg["discard_oversize"],
)
else:
batches = util.minibatch(train_examples, size=cfg["batch_size"])
# make sure the minibatch_by_words result is not empty, or we'll have an infinite training loop
try:
first = next(batches)
yield epoch, first
except StopIteration:
raise ValueError(Errors.E986)
for batch in batches:
yield epoch, batch yield epoch, batch
if max_epochs >= 1 and epoch >= max_epochs: if max_epochs != 1:
break examples.extend(batch)
random.shuffle(train_examples) if not examples:
# Raise error if no data
raise ValueError(Errors.E986)
while epoch != max_epochs:
random.shuffle(examples)
for batch in batcher(examples):
yield epoch, batch
epoch += 1
def create_evaluation_callback( def create_evaluation_callback(
nlp: Language, nlp: Language,
optimizer: Optimizer, dev_corpus: Callable,
corpus: Corpus, weights: Dict[str, float],
cfg: Union[Config, Dict[str, Any]],
) -> Callable[[], Tuple[float, Dict[str, float]]]: ) -> Callable[[], Tuple[float, Dict[str, float]]]:
def evaluate() -> Tuple[float, Dict[str, float]]: def evaluate() -> Tuple[float, Dict[str, float]]:
dev_examples = corpus.dev_dataset(nlp, gold_preproc=cfg["gold_preproc"]) dev_examples = list(dev_corpus(nlp))
dev_examples = list(dev_examples) scores = nlp.evaluate(dev_examples)
n_words = sum(len(ex.predicted) for ex in dev_examples)
batch_size = cfg["eval_batch_size"]
if optimizer.averages:
with nlp.use_params(optimizer.averages):
scores = nlp.evaluate(dev_examples, batch_size=batch_size)
else:
scores = nlp.evaluate(dev_examples, batch_size=batch_size)
# Calculate a weighted sum based on score_weights for the main score # Calculate a weighted sum based on score_weights for the main score
weights = cfg["score_weights"]
try: try:
weighted_score = sum(scores[s] * weights.get(s, 0.0) for s in weights) weighted_score = sum(scores[s] * weights.get(s, 0.0) for s in weights)
except KeyError as e: except KeyError as e:
@ -348,6 +292,10 @@ def train_while_improving(
proc.model.finish_update(optimizer) proc.model.finish_update(optimizer)
optimizer.step_schedules() optimizer.step_schedules()
if not (step % eval_frequency): if not (step % eval_frequency):
if optimizer.averages:
with nlp.use_params(optimizer.averages):
score, other_scores = evaluate()
else:
score, other_scores = evaluate() score, other_scores = evaluate()
results.append((score, step)) results.append((score, step))
is_best_checkpoint = score == max(results)[0] is_best_checkpoint = score == max(results)[0]
@ -459,17 +407,7 @@ def load_from_paths(
msg.fail("Can't find raw text", raw_text, exits=1) msg.fail("Can't find raw text", raw_text, exits=1)
raw_text = list(srsly.read_jsonl(config["training"]["raw_text"])) raw_text = list(srsly.read_jsonl(config["training"]["raw_text"]))
tag_map = {} tag_map = {}
tag_map_path = util.ensure_path(config["training"]["tag_map"])
if tag_map_path is not None:
if not tag_map_path.exists():
msg.fail("Can't find tag map path", tag_map_path, exits=1)
tag_map = srsly.read_json(config["training"]["tag_map"])
morph_rules = {} morph_rules = {}
morph_rules_path = util.ensure_path(config["training"]["morph_rules"])
if morph_rules_path is not None:
if not morph_rules_path.exists():
msg.fail("Can't find tag map path", morph_rules_path, exits=1)
morph_rules = srsly.read_json(config["training"]["morph_rules"])
weights_data = None weights_data = None
init_tok2vec = util.ensure_path(config["training"]["init_tok2vec"]) init_tok2vec = util.ensure_path(config["training"]["init_tok2vec"])
if init_tok2vec is not None: if init_tok2vec is not None:
@ -481,18 +419,12 @@ def load_from_paths(
def verify_cli_args( def verify_cli_args(
train_path: Path,
dev_path: Path,
config_path: Path, config_path: Path,
output_path: Optional[Path] = None, output_path: Optional[Path] = None,
) -> None: ) -> None:
# Make sure all files and paths exists if they are needed # Make sure all files and paths exists if they are needed
if not config_path or not config_path.exists(): if not config_path or not config_path.exists():
msg.fail("Config file not found", config_path, exits=1) msg.fail("Config file not found", config_path, exits=1)
if not train_path or not train_path.exists():
msg.fail("Training data not found", train_path, exits=1)
if not dev_path or not dev_path.exists():
msg.fail("Development data not found", dev_path, exits=1)
if output_path is not None: if output_path is not None:
if not output_path.exists(): if not output_path.exists():
output_path.mkdir() output_path.mkdir()

77
spacy/default_config.cfg
View File

@ -1,3 +1,13 @@
[paths]
train = ""
dev = ""
raw = null
init_tok2vec = null
[system]
seed = 0
use_pytorch_for_gpu_memory = false
[nlp] [nlp]
lang = null lang = null
pipeline = [] pipeline = []
@ -13,38 +23,55 @@ load_vocab_data = true
# Training hyper-parameters and additional features. # Training hyper-parameters and additional features.
[training] [training]
# Whether to train on sequences with 'gold standard' sentence boundaries seed = ${system:seed}
# and tokens. If you set this to true, take care to ensure your run-time
# data is passed in sentence-by-sentence via some prior preprocessing.
gold_preproc = false
# Limitations on training document length or number of examples.
max_length = 5000
limit = 0
# Data augmentation
orth_variant_level = 0.0
dropout = 0.1 dropout = 0.1
accumulate_gradient = 1
# Extra resources for transfer-learning or pseudo-rehearsal
init_tok2vec = ${paths:init_tok2vec}
raw_text = ${paths:raw}
vectors = null
# Controls early-stopping. 0 or -1 mean unlimited. # Controls early-stopping. 0 or -1 mean unlimited.
patience = 1600 patience = 1600
max_epochs = 0 max_epochs = 0
max_steps = 20000 max_steps = 20000
eval_frequency = 200 eval_frequency = 200
eval_batch_size = 128
# Other settings
seed = 0
accumulate_gradient = 1
use_pytorch_for_gpu_memory = false
# Control how scores are printed and checkpoints are evaluated. # Control how scores are printed and checkpoints are evaluated.
score_weights = {} score_weights = {}
# These settings are invalid for the transformer models.
init_tok2vec = null [training.train_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:train}
# Whether to train on sequences with 'gold standard' sentence boundaries
# and tokens. If you set this to true, take care to ensure your run-time
# data is passed in sentence-by-sentence via some prior preprocessing.
gold_preproc = false
# Limitations on training document length
max_length = 2000
# Limitation on number of training examples
limit = 0
[training.dev_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:dev}
# Whether to train on sequences with 'gold standard' sentence boundaries
# and tokens. If you set this to true, take care to ensure your run-time
# data is passed in sentence-by-sentence via some prior preprocessing.
gold_preproc = false
# Limitations on training document length
max_length = 2000
# Limitation on number of training examples
limit = 0
[training.batcher]
@batchers = "batch_by_words.v1"
discard_oversize = false discard_oversize = false
raw_text = null tolerance = 0.2
tag_map = null
morph_rules = null [training.batcher.size]
base_model = null @schedules = "compounding.v1"
vectors = null start = 100
batch_by = "words" stop = 1000
batch_size = 1000 compound = 1.001
[training.optimizer] [training.optimizer]
@optimizers = "Adam.v1" @optimizers = "Adam.v1"
@ -69,8 +96,8 @@ max_length = 500
dropout = 0.2 dropout = 0.2
n_save_every = null n_save_every = null
batch_size = 3000 batch_size = 3000
seed = ${training:seed} seed = ${system:seed}
use_pytorch_for_gpu_memory = ${training:use_pytorch_for_gpu_memory} use_pytorch_for_gpu_memory = ${system:use_pytorch_for_gpu_memory}
tok2vec_model = "components.tok2vec.model" tok2vec_model = "components.tok2vec.model"
[pretraining.objective] [pretraining.objective]

3
spacy/gold/__init__.py
View File

@ -9,3 +9,6 @@ from .iob_utils import tags_to_entities
from .gold_io import docs_to_json from .gold_io import docs_to_json
from .gold_io import read_json_file from .gold_io import read_json_file
from .batchers import minibatch_by_padded_size, minibatch_by_words

172
spacy/gold/batchers.py Normal file
View File

@ -0,0 +1,172 @@
from typing import Union, Iterator, Iterable, Sequence, TypeVar, List, Callable
from typing import Optional, Any
from functools import partial
import itertools
from .example import Example
from ..util import registry, minibatch
Sizing = Union[Iterable[int], int]
ItemT = TypeVar("ItemT")
BatcherT = Callable[[Iterable[ItemT]], Iterable[List[ItemT]]]
@registry.batchers("batch_by_padded.v1")
def configure_minibatch_by_padded_size(
*,
size: Sizing,
buffer: int,
discard_oversize: bool,
get_length: Optional[Callable[[ItemT], int]] = None
) -> BatcherT:
# Avoid displacing optional values from the underlying function.
optionals = {"get_length": get_length} if get_length is not None else {}
return partial(
minibatch_by_padded_size,
size=size,
buffer=buffer,
discard_oversize=discard_oversize,
**optionals
)
@registry.batchers("batch_by_words.v1")
def configure_minibatch_by_words(
*,
size: Sizing,
tolerance: float,
discard_oversize: bool,
get_length: Optional[Callable[[ItemT], int]] = None
) -> BatcherT:
optionals = {"get_length": get_length} if get_length is not None else {}
return partial(
minibatch_by_words,
size=size,
discard_oversize=discard_oversize,
**optionals
)
@registry.batchers("batch_by_sequence.v1")
def configure_minibatch(size: Sizing, get_length=None) -> BatcherT:
optionals = ({"get_length": get_length} if get_length is not None else {})
return partial(minibatch, size=size, **optionals)
def minibatch_by_padded_size(
docs: Iterator["Doc"],
size: Sizing,
buffer: int = 256,
discard_oversize: bool = False,
get_length: Callable = len,
) -> Iterator[Iterator["Doc"]]:
if isinstance(size, int):
size_ = itertools.repeat(size)
else:
size_ = size
for outer_batch in minibatch(docs, size=buffer):
outer_batch = list(outer_batch)
target_size = next(size_)
for indices in _batch_by_length(outer_batch, target_size, get_length):
subbatch = [outer_batch[i] for i in indices]
padded_size = max(len(seq) for seq in subbatch) * len(subbatch)
if discard_oversize and padded_size >= target_size:
pass
else:
yield subbatch
def minibatch_by_words(
docs, size, tolerance=0.2, discard_oversize=False, get_length=len
):
"""Create minibatches of roughly a given number of words. If any examples
are longer than the specified batch length, they will appear in a batch by
themselves, or be discarded if discard_oversize=True.
The argument 'docs' can be a list of strings, Doc's or Example's. """
if isinstance(size, int):
size_ = itertools.repeat(size)
elif isinstance(size, List):
size_ = iter(size)
else:
size_ = size
target_size = next(size_)
tol_size = target_size * tolerance
batch = []
overflow = []
batch_size = 0
overflow_size = 0
for doc in docs:
n_words = get_length(doc)
# if the current example exceeds the maximum batch size, it is returned separately
# but only if discard_oversize=False.
if n_words > target_size + tol_size:
if not discard_oversize:
yield [doc]
# add the example to the current batch if there's no overflow yet and it still fits
elif overflow_size == 0 and (batch_size + n_words) <= target_size:
batch.append(doc)
batch_size += n_words
# add the example to the overflow buffer if it fits in the tolerance margin
elif (batch_size + overflow_size + n_words) <= (target_size + tol_size):
overflow.append(doc)
overflow_size += n_words
# yield the previous batch and start a new one. The new one gets the overflow examples.
else:
if batch:
yield batch
target_size = next(size_)
tol_size = target_size * tolerance
batch = overflow
batch_size = overflow_size
overflow = []
overflow_size = 0
# this example still fits
if (batch_size + n_words) <= target_size:
batch.append(doc)
batch_size += n_words
# this example fits in overflow
elif (batch_size + n_words) <= (target_size + tol_size):
overflow.append(doc)
overflow_size += n_words
# this example does not fit with the previous overflow: start another new batch
else:
if batch:
yield batch
target_size = next(size_)
tol_size = target_size * tolerance
batch = [doc]
batch_size = n_words
batch.extend(overflow)
if batch:
yield batch
def _batch_by_length(
seqs: Sequence[Any], max_words: int, get_length=len
) -> List[List[Any]]:
"""Given a list of sequences, return a batched list of indices into the
list, where the batches are grouped by length, in descending order.
Batches may be at most max_words in size, defined as max sequence length * size.
"""
# Use negative index so we can get sort by position ascending.
lengths_indices = [(get_length(seq), i) for i, seq in enumerate(seqs)]
lengths_indices.sort()
batches = []
batch = []
for length, i in lengths_indices:
if not batch:
batch.append(i)
elif length * (len(batch) + 1) <= max_words:
batch.append(i)
else:
batches.append(batch)
batch = [i]
if batch:
batches.append(batch)
# Check lengths match
assert sum(len(b) for b in batches) == len(seqs)
batches = [list(sorted(batch)) for batch in batches]
batches.reverse()
return batches

121
spacy/gold/corpus.py
View File

@ -1,4 +1,4 @@
from typing import Union, List, Iterable, Iterator, TYPE_CHECKING from typing import Union, List, Iterable, Iterator, TYPE_CHECKING, Callable, Tuple
from pathlib import Path from pathlib import Path
import random import random
@ -12,26 +12,38 @@ if TYPE_CHECKING:
from ..language import Language # noqa: F401 from ..language import Language # noqa: F401
@util.registry.readers("spacy.Corpus.v1")
def create_docbin_reader(
path: Path, gold_preproc: bool, max_length: int = 0, limit: int = 0
) -> Callable[["Language"], Iterable[Example]]:
return Corpus(path, gold_preproc=gold_preproc, max_length=max_length, limit=limit)
class Corpus: class Corpus:
"""An annotated corpus, reading train and dev datasets from """Iterate Example objects from a file or directory of DocBin (.spacy)
the DocBin (.spacy) format. formated data files.
path (Path): The directory or filename to read from.
gold_preproc (bool): Whether to set up the Example object with gold-standard
sentences and tokens for the predictions. Gold preprocessing helps
the annotations align to the tokenization, and may result in sequences
of more consistent length. However, it may reduce run-time accuracy due
to train/test skew. Defaults to False.
max_length (int): Maximum document length. Longer documents will be
split into sentences, if sentence boundaries are available. Defaults to
0, which indicates no limit.
limit (int): Limit corpus to a subset of examples, e.g. for debugging.
Defaults to 0, which indicates no limit.
DOCS: https://spacy.io/api/corpus DOCS: https://spacy.io/api/corpus
""" """
def __init__( def __init__(
self, train_loc: Union[str, Path], dev_loc: Union[str, Path], limit: int = 0 self, path, *, limit: int = 0, gold_preproc: bool = False, max_length: bool = False,
) -> None: ) -> None:
"""Create a Corpus. self.path = util.ensure_path(path)
self.gold_preproc = gold_preproc
train (str / Path): File or directory of training data. self.max_length = max_length
dev (str / Path): File or directory of development data.
limit (int): Max. number of examples returned.
DOCS: https://spacy.io/api/corpus#init
"""
self.train_loc = train_loc
self.dev_loc = dev_loc
self.limit = limit self.limit = limit
@staticmethod @staticmethod
@ -54,6 +66,22 @@ class Corpus:
locs.append(path) locs.append(path)
return locs return locs
def __call__(self, nlp: "Language") -> Iterator[Example]:
"""Yield examples from the data.
nlp (Language): The current nlp object.
loc (Path): The file or directory to read from.
YIELDS (Example): The examples.
DOCS: https://spacy.io/api/corpus#call
"""
ref_docs = self.read_docbin(nlp.vocab, self.walk_corpus(self.path))
if self.gold_preproc:
examples = self.make_examples_gold_preproc(nlp, ref_docs)
else:
examples = self.make_examples(nlp, ref_docs, self.max_length)
yield from examples
def _make_example( def _make_example(
self, nlp: "Language", reference: Doc, gold_preproc: bool self, nlp: "Language", reference: Doc, gold_preproc: bool
) -> Example: ) -> Example:
@ -114,68 +142,3 @@ class Corpus:
i += 1 i += 1
if self.limit >= 1 and i >= self.limit: if self.limit >= 1 and i >= self.limit:
break break
def count_train(self, nlp: "Language") -> int:
"""Returns count of words in train examples.
nlp (Language): The current nlp. object.
RETURNS (int): The word count.
DOCS: https://spacy.io/api/corpus#count_train
"""
n = 0
i = 0
for example in self.train_dataset(nlp):
n += len(example.predicted)
if self.limit >= 0 and i >= self.limit:
break
i += 1
return n
def train_dataset(
self,
nlp: "Language",
*,
shuffle: bool = True,
gold_preproc: bool = False,
max_length: int = 0
) -> Iterator[Example]:
"""Yield examples from the training data.
nlp (Language): The current nlp object.
shuffle (bool): Whether to shuffle the examples.
gold_preproc (bool): Whether to train on gold-standard sentences and tokens.
max_length (int): Maximum document length. Longer documents will be
split into sentences, if sentence boundaries are available. 0 for
no limit.
YIELDS (Example): The examples.
DOCS: https://spacy.io/api/corpus#train_dataset
"""
ref_docs = self.read_docbin(nlp.vocab, self.walk_corpus(self.train_loc))
if gold_preproc:
examples = self.make_examples_gold_preproc(nlp, ref_docs)
else:
examples = self.make_examples(nlp, ref_docs, max_length)
if shuffle:
examples = list(examples)
random.shuffle(examples)
yield from examples
def dev_dataset(
self, nlp: "Language", *, gold_preproc: bool = False
) -> Iterator[Example]:
"""Yield examples from the development data.
nlp (Language): The current nlp object.
gold_preproc (bool): Whether to train on gold-standard sentences and tokens.
YIELDS (Example): The examples.
DOCS: https://spacy.io/api/corpus#dev_dataset
"""
ref_docs = self.read_docbin(nlp.vocab, self.walk_corpus(self.dev_loc))
if gold_preproc:
examples = self.make_examples_gold_preproc(nlp, ref_docs)
else:
examples = self.make_examples(nlp, ref_docs, max_length=0)
yield from examples

24
spacy/schemas.py
View File

@ -1,13 +1,18 @@
from typing import Dict, List, Union, Optional, Sequence, Any, Callable, Type from typing import Dict, List, Union, Optional, Sequence, Any, Callable, Type
from typing import Iterable, TypeVar
from enum import Enum from enum import Enum
from pydantic import BaseModel, Field, ValidationError, validator from pydantic import BaseModel, Field, ValidationError, validator
from pydantic import StrictStr, StrictInt, StrictFloat, StrictBool from pydantic import StrictStr, StrictInt, StrictFloat, StrictBool
from pydantic import root_validator from pydantic import root_validator
from collections import defaultdict from collections import defaultdict
from thinc.api import Optimizer from thinc.api import Optimizer
from pathlib import Path
from .attrs import NAMES from .attrs import NAMES
ItemT = TypeVar("ItemT")
Batcher = Callable[[Iterable[ItemT]], Iterable[List[ItemT]]]
def validate(schema: Type[BaseModel], obj: Dict[str, Any]) -> List[str]: def validate(schema: Type[BaseModel], obj: Dict[str, Any]) -> List[str]:
"""Validate data against a given pydantic schema. """Validate data against a given pydantic schema.
@ -178,32 +183,24 @@ class ModelMetaSchema(BaseModel):
# check that against this schema in the test suite to make sure it's always # check that against this schema in the test suite to make sure it's always
# up to date. # up to date.
Reader = Callable[["Language", str], Iterable["Example"]]
class ConfigSchemaTraining(BaseModel): class ConfigSchemaTraining(BaseModel):
# fmt: off # fmt: off
base_model: Optional[StrictStr] = Field(..., title="The base model to use")
vectors: Optional[StrictStr] = Field(..., title="Path to vectors") vectors: Optional[StrictStr] = Field(..., title="Path to vectors")
gold_preproc: StrictBool = Field(..., title="Whether to train on gold-standard sentences and tokens") train_corpus: Reader = Field(..., title="Reader for the training data")
max_length: StrictInt = Field(..., title="Maximum length of examples (longer examples are divided into sentences if possible)") dev_corpus: Reader = Field(..., title="Reader for the dev data")
limit: StrictInt = Field(..., title="Number of examples to use (0 for all)") batcher: Batcher = Field(..., title="Batcher for the training data")
orth_variant_level: StrictFloat = Field(..., title="Orth variants for data augmentation")
dropout: StrictFloat = Field(..., title="Dropout rate") dropout: StrictFloat = Field(..., title="Dropout rate")
patience: StrictInt = Field(..., title="How many steps to continue without improvement in evaluation score") patience: StrictInt = Field(..., title="How many steps to continue without improvement in evaluation score")
max_epochs: StrictInt = Field(..., title="Maximum number of epochs to train for") max_epochs: StrictInt = Field(..., title="Maximum number of epochs to train for")
max_steps: StrictInt = Field(..., title="Maximum number of update steps to train for") max_steps: StrictInt = Field(..., title="Maximum number of update steps to train for")
eval_frequency: StrictInt = Field(..., title="How often to evaluate during training (steps)") eval_frequency: StrictInt = Field(..., title="How often to evaluate during training (steps)")
eval_batch_size: StrictInt = Field(..., title="Evaluation batch size")
seed: Optional[StrictInt] = Field(..., title="Random seed") seed: Optional[StrictInt] = Field(..., title="Random seed")
accumulate_gradient: StrictInt = Field(..., title="Whether to divide the batch up into substeps") accumulate_gradient: StrictInt = Field(..., title="Whether to divide the batch up into substeps")
use_pytorch_for_gpu_memory: StrictBool = Field(..., title="Allocate memory via PyTorch")
score_weights: Dict[StrictStr, Union[StrictFloat, StrictInt]] = Field(..., title="Scores to report and their weights for selecting final model") score_weights: Dict[StrictStr, Union[StrictFloat, StrictInt]] = Field(..., title="Scores to report and their weights for selecting final model")
init_tok2vec: Optional[StrictStr] = Field(..., title="Path to pretrained tok2vec weights") init_tok2vec: Optional[StrictStr] = Field(..., title="Path to pretrained tok2vec weights")
discard_oversize: StrictBool = Field(..., title="Whether to skip examples longer than batch size") raw_text: Optional[StrictStr] = Field(default=None, title="Raw text")
batch_by: StrictStr = Field(..., title="Batch examples by type")
raw_text: Optional[StrictStr] = Field(..., title="Raw text")
tag_map: Optional[StrictStr] = Field(..., title="Path to JSON-formatted tag map")
morph_rules: Optional[StrictStr] = Field(..., title="Path to morphology rules")
batch_size: Union[Sequence[int], int] = Field(..., title="The batch size or batch size schedule")
optimizer: Optimizer = Field(..., title="The optimizer to use") optimizer: Optimizer = Field(..., title="The optimizer to use")
# fmt: on # fmt: on
@ -211,6 +208,7 @@ class ConfigSchemaTraining(BaseModel):
extra = "forbid" extra = "forbid"
arbitrary_types_allowed = True arbitrary_types_allowed = True
#eval_batch_size: StrictInt = Field(..., title="Evaluation batch size")
class ConfigSchemaNlp(BaseModel): class ConfigSchemaNlp(BaseModel):
# fmt: off # fmt: off

2
spacy/tests/parser/test_ner.py
View File

@ -210,7 +210,7 @@ def test_train_empty():
nlp.begin_training() nlp.begin_training()
for itn in range(2): for itn in range(2):
losses = {} losses = {}
batches = util.minibatch(train_examples) batches = util.minibatch(train_examples, size=8)
for batch in batches: for batch in batches:
nlp.update(batch, losses=losses) nlp.update(batch, losses=losses)

5
spacy/tests/regression/test_issue4001-4500.py
View File

@ -438,9 +438,8 @@ def test_issue4402():
data = DocBin(docs=docs, attrs=attrs).to_bytes() data = DocBin(docs=docs, attrs=attrs).to_bytes()
with output_file.open("wb") as file_: with output_file.open("wb") as file_:
file_.write(data) file_.write(data)
corpus = Corpus(train_loc=str(output_file), dev_loc=str(output_file)) reader = Corpus(output_file)
train_data = list(reader(nlp))
train_data = list(corpus.train_dataset(nlp))
assert len(train_data) == 2 assert len(train_data) == 2
split_train_data = [] split_train_data = []

19
spacy/tests/serialize/test_serialize_config.py
View File

@ -11,8 +11,23 @@ from ..util import make_tempdir
nlp_config_string = """ nlp_config_string = """
[paths]
train = ""
dev = ""
[training] [training]
batch_size = 666
[training.train_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:train}
[training.dev_corpus]
@readers = "spacy.Corpus.v1"
path = ${paths:dev}
[training.batcher]
@batchers = "batch_by_words.v1"
size = 666
[nlp] [nlp]
lang = "en" lang = "en"
@ -93,7 +108,7 @@ def test_create_nlp_from_config():
with pytest.raises(ConfigValidationError): with pytest.raises(ConfigValidationError):
nlp, _ = load_model_from_config(config, auto_fill=False) nlp, _ = load_model_from_config(config, auto_fill=False)
nlp, resolved = load_model_from_config(config, auto_fill=True) nlp, resolved = load_model_from_config(config, auto_fill=True)
assert nlp.config["training"]["batch_size"] == 666 assert nlp.config["training"]["batcher"]["size"] == 666
assert len(nlp.config["training"]) > 1 assert len(nlp.config["training"]) > 1
assert nlp.pipe_names == ["tok2vec", "tagger"] assert nlp.pipe_names == ["tok2vec", "tagger"]
assert len(nlp.config["components"]) == 2 assert len(nlp.config["components"]) == 2

13
spacy/tests/test_gold.py
View File

@ -483,14 +483,14 @@ def test_roundtrip_docs_to_docbin(doc):
reloaded_nlp = English() reloaded_nlp = English()
json_file = tmpdir / "roundtrip.json" json_file = tmpdir / "roundtrip.json"
srsly.write_json(json_file, [docs_to_json(doc)]) srsly.write_json(json_file, [docs_to_json(doc)])
goldcorpus = Corpus(str(json_file), str(json_file))
output_file = tmpdir / "roundtrip.spacy" output_file = tmpdir / "roundtrip.spacy"
data = DocBin(docs=[doc]).to_bytes() data = DocBin(docs=[doc]).to_bytes()
with output_file.open("wb") as file_: with output_file.open("wb") as file_:
file_.write(data) file_.write(data)
goldcorpus = Corpus(train_loc=str(output_file), dev_loc=str(output_file)) reader = Corpus(output_file)
reloaded_example = next(goldcorpus.dev_dataset(nlp=reloaded_nlp)) reloaded_examples = list(reader(reloaded_nlp))
assert len(doc) == goldcorpus.count_train(reloaded_nlp) assert len(doc) == sum(len(eg) for eg in reloaded_examples)
reloaded_example = reloaded_examples[0]
assert text == reloaded_example.reference.text assert text == reloaded_example.reference.text
assert idx == [t.idx for t in reloaded_example.reference] assert idx == [t.idx for t in reloaded_example.reference]
assert tags == [t.tag_ for t in reloaded_example.reference] assert tags == [t.tag_ for t in reloaded_example.reference]
@ -515,10 +515,9 @@ def test_make_orth_variants(doc):
data = DocBin(docs=[doc]).to_bytes() data = DocBin(docs=[doc]).to_bytes()
with output_file.open("wb") as file_: with output_file.open("wb") as file_:
file_.write(data) file_.write(data)
goldcorpus = Corpus(train_loc=str(output_file), dev_loc=str(output_file))
# due to randomness, test only that this runs with no errors for now # due to randomness, test only that this runs with no errors for now
train_example = next(goldcorpus.train_dataset(nlp)) reader = Corpus(output_file)
train_example = next(reader(nlp))
make_orth_variants_example(nlp, train_example, orth_variant_level=0.2) make_orth_variants_example(nlp, train_example, orth_variant_level=0.2)

3
spacy/tests/test_util.py
View File

@ -3,8 +3,9 @@ import pytest
from .util import get_random_doc from .util import get_random_doc
from spacy import util from spacy import util
from spacy.util import minibatch_by_words, dot_to_object from spacy.util import dot_to_object
from thinc.api import Config, Optimizer from thinc.api import Config, Optimizer
from spacy.gold.batchers import minibatch_by_words
from ..lang.en import English from ..lang.en import English
from ..lang.nl import Dutch from ..lang.nl import Dutch

160
spacy/util.py
View File

@ -67,6 +67,8 @@ class registry(thinc.registry):
lookups = catalogue.create("spacy", "lookups", entry_points=True) lookups = catalogue.create("spacy", "lookups", entry_points=True)
displacy_colors = catalogue.create("spacy", "displacy_colors", entry_points=True) displacy_colors = catalogue.create("spacy", "displacy_colors", entry_points=True)
assets = catalogue.create("spacy", "assets", entry_points=True) assets = catalogue.create("spacy", "assets", entry_points=True)
batchers = catalogue.create("spacy", "batchers", entry_points=True)
readers = catalogue.create("spacy", "readers", entry_points=True)
# These are factories registered via third-party packages and the # These are factories registered via third-party packages and the
# spacy_factories entry point. This registry only exists so we can easily # spacy_factories entry point. This registry only exists so we can easily
# load them via the entry points. The "true" factories are added via the # load them via the entry points. The "true" factories are added via the
@ -747,144 +749,6 @@ def normalize_slice(
return start, stop return start, stop
def minibatch(
items: Iterable[Any], size: Union[Iterator[int], int] = 8
) -> Iterator[Any]:
"""Iterate over batches of items. `size` may be an iterator,
so that batch-size can vary on each step.
"""
if isinstance(size, int):
size_ = itertools.repeat(size)
else:
size_ = size
items = iter(items)
while True:
batch_size = next(size_)
batch = list(itertools.islice(items, int(batch_size)))
if len(batch) == 0:
break
yield list(batch)
def minibatch_by_padded_size(
docs: Iterator["Doc"],
size: Union[Iterator[int], int],
buffer: int = 256,
discard_oversize: bool = False,
) -> Iterator[Iterator["Doc"]]:
if isinstance(size, int):
size_ = itertools.repeat(size)
else:
size_ = size
for outer_batch in minibatch(docs, buffer):
outer_batch = list(outer_batch)
target_size = next(size_)
for indices in _batch_by_length(outer_batch, target_size):
subbatch = [outer_batch[i] for i in indices]
padded_size = max(len(seq) for seq in subbatch) * len(subbatch)
if discard_oversize and padded_size >= target_size:
pass
else:
yield subbatch
def _batch_by_length(seqs: Sequence[Any], max_words: int) -> List[List[Any]]:
"""Given a list of sequences, return a batched list of indices into the
list, where the batches are grouped by length, in descending order.
Batches may be at most max_words in size, defined as max sequence length * size.
"""
# Use negative index so we can get sort by position ascending.
lengths_indices = [(len(seq), i) for i, seq in enumerate(seqs)]
lengths_indices.sort()
batches = []
batch = []
for length, i in lengths_indices:
if not batch:
batch.append(i)
elif length * (len(batch) + 1) <= max_words:
batch.append(i)
else:
batches.append(batch)
batch = [i]
if batch:
batches.append(batch)
# Check lengths match
assert sum(len(b) for b in batches) == len(seqs)
batches = [list(sorted(batch)) for batch in batches]
batches.reverse()
return batches
def minibatch_by_words(docs, size, tolerance=0.2, discard_oversize=False):
"""Create minibatches of roughly a given number of words. If any examples
are longer than the specified batch length, they will appear in a batch by
themselves, or be discarded if discard_oversize=True.
The argument 'docs' can be a list of strings, Doc's or Example's. """
from .gold import Example
if isinstance(size, int):
size_ = itertools.repeat(size)
elif isinstance(size, List):
size_ = iter(size)
else:
size_ = size
target_size = next(size_)
tol_size = target_size * tolerance
batch = []
overflow = []
batch_size = 0
overflow_size = 0
for doc in docs:
if isinstance(doc, Example):
n_words = len(doc.reference)
elif isinstance(doc, str):
n_words = len(doc.split())
else:
n_words = len(doc)
# if the current example exceeds the maximum batch size, it is returned separately
# but only if discard_oversize=False.
if n_words > target_size + tol_size:
if not discard_oversize:
yield [doc]
# add the example to the current batch if there's no overflow yet and it still fits
elif overflow_size == 0 and (batch_size + n_words) <= target_size:
batch.append(doc)
batch_size += n_words
# add the example to the overflow buffer if it fits in the tolerance margin
elif (batch_size + overflow_size + n_words) <= (target_size + tol_size):
overflow.append(doc)
overflow_size += n_words
# yield the previous batch and start a new one. The new one gets the overflow examples.
else:
if batch:
yield batch
target_size = next(size_)
tol_size = target_size * tolerance
batch = overflow
batch_size = overflow_size
overflow = []
overflow_size = 0
# this example still fits
if (batch_size + n_words) <= target_size:
batch.append(doc)
batch_size += n_words
# this example fits in overflow
elif (batch_size + n_words) <= (target_size + tol_size):
overflow.append(doc)
overflow_size += n_words
# this example does not fit with the previous overflow: start another new batch
else:
if batch:
yield batch
target_size = next(size_)
tol_size = target_size * tolerance
batch = [doc]
batch_size = n_words
batch.extend(overflow)
if batch:
yield batch
def filter_spans(spans: Iterable["Span"]) -> List["Span"]: def filter_spans(spans: Iterable["Span"]) -> List["Span"]:
"""Filter a sequence of spans and remove duplicates or overlaps. Useful for """Filter a sequence of spans and remove duplicates or overlaps. Useful for
@ -1217,3 +1081,23 @@ def create_default_optimizer() -> Optimizer:
L2_is_weight_decay=L2_is_weight_decay, L2_is_weight_decay=L2_is_weight_decay,
) )
return optimizer return optimizer
def minibatch(items, size):
"""Iterate over batches of items. `size` may be an iterator,
so that batch-size can vary on each step.
"""
if isinstance(size, int):
size_ = itertools.repeat(size)
else:
size_ = size
items = iter(items)
while True:
batch_size = next(size_)
batch = list(itertools.islice(items, int(batch_size)))
if len(batch) == 0:
break
yield list(batch)