def from_params(
cls, vocab: Vocabulary,
params: Params) -> 'TokenCharactersEncoder': # type: ignore
# pylint: disable=arguments-differ
embedding_params: Params = params.pop("embedding")
# Embedding.from_params() uses "tokens" as the default namespace, but we need to change
# that to be "token_characters" by default.
embedding_params.setdefault("vocab_namespace", "token_characters")
embedding = Embedding.from_params(vocab, embedding_params)
encoder_params: Params = params.pop("encoder")
encoder = Seq2VecEncoder.from_params(encoder_params)
dropout = params.pop_float("dropout", 0.0)
params.assert_empty(cls.__name__)
return cls(embedding, encoder, dropout)
def extend_from_instances(self,
params: Params,
instances: Iterable['adi.Instance'] = ()) -> None:
"""
Extends an already generated vocabulary using a collection of instances.
"""
min_count = params.pop("min_count", None)
max_vocab_size = pop_max_vocab_size(params)
non_padded_namespaces = params.pop("non_padded_namespaces", DEFAULT_NON_PADDED_NAMESPACES)
pretrained_files = params.pop("pretrained_files", {})
min_pretrained_embeddings = params.pop("min_pretrained_embeddings", None)
only_include_pretrained_words = params.pop_bool("only_include_pretrained_words", False)
tokens_to_add = params.pop("tokens_to_add", None)
params.assert_empty("Vocabulary - from dataset")
logger.info("Fitting token dictionary from dataset.")
namespace_token_counts: Dict[str, Dict[str, int]] = defaultdict(lambda: defaultdict(int))
for instance in Tqdm.tqdm(instances):
instance.count_vocab_items(namespace_token_counts)
self._extend(counter=namespace_token_counts,
min_count=min_count,
max_vocab_size=max_vocab_size,
non_padded_namespaces=non_padded_namespaces,
pretrained_files=pretrained_files,
only_include_pretrained_words=only_include_pretrained_words,
tokens_to_add=tokens_to_add,
min_pretrained_embeddings=min_pretrained_embeddings)
def from_params(
cls, vocab: Vocabulary,
params: Params) -> 'BasicTextFieldEmbedder': # type: ignore
# pylint: disable=arguments-differ,bad-super-call
# The original `from_params` for this class was designed in a way that didn't agree
# with the constructor. The constructor wants a 'token_embedders' parameter that is a
# `Dict[str, TokenEmbedder]`, but the original `from_params` implementation expected those
# key-value pairs to be top-level in the params object.
#
# This breaks our 'configuration wizard' and configuration checks. Hence, going forward,
# the params need a 'token_embedders' key so that they line up with what the constructor wants.
# For now, the old behavior is still supported, but produces a DeprecationWarning.
embedder_to_indexer_map = params.pop("embedder_to_indexer_map", None)
if embedder_to_indexer_map is not None:
embedder_to_indexer_map = embedder_to_indexer_map.as_dict(
quiet=True)
allow_unmatched_keys = bool(params.pop("allow_unmatched_keys", False))
token_embedder_params = params.pop('token_embedders', None)
if token_embedder_params is not None:
# New way: explicitly specified, so use it.
token_embedders = {
name: Embedding.from_params(vocab=vocab, params=subparams)
for name, subparams in token_embedder_params.items()
}
else:
# Warn that the original behavior is deprecated
warnings.warn(
DeprecationWarning(
"the token embedders for BasicTextFieldEmbedder should now "
"be specified as a dict under the 'token_embedders' key, "
"not as top-level key-value pairs"))
token_embedders = {}
keys = list(params.keys())
for key in keys:
embedder_params = params.pop(key)
token_embedders[key] = Embedding.from_params(
vocab=vocab, params=embedder_params)
# TODO(pitrack): replace this line?
# params.assert_empty(cls.__name__)
return cls(token_embedders, embedder_to_indexer_map,
allow_unmatched_keys)
def create_serialization_dir(params: Params) -> None:
"""
This function creates the serialization directory if it doesn't exist. If it already exists
and is non-empty, then it verifies that we're recovering from a training with an identical configuration.
Parameters
----------
params: ``Params``
A parameter object specifying an AllenNLP Experiment.
serialization_dir: ``str``
The directory in which to save results and logs.
recover: ``bool``
If ``True``, we will try to recover from an existing serialization directory, and crash if
the directory doesn't exist, or doesn't match the configuration we're given.
"""
serialization_dir = params['environment']['serialization_dir']
recover = params['environment']['recover']
if os.path.exists(serialization_dir) and os.listdir(serialization_dir):
if not recover:
raise ConfigurationError(
f"Serialization directory ({serialization_dir}) already exists and is "
f"not empty. Specify --recover to recover training from existing output."
)
logger.info(f"Recovering from prior training at {serialization_dir}.")
recovered_config_file = os.path.join(serialization_dir, CONFIG_NAME)
if not os.path.exists(recovered_config_file):
raise ConfigurationError(
"The serialization directory already exists but doesn't "
"contain a config.json. You probably gave the wrong directory."
)
else:
loaded_params = Params.from_file(recovered_config_file)
if params != loaded_params:
raise ConfigurationError(
"Training configuration does not match the configuration we're "
"recovering from.")
# In the recover mode, we don't need to reload the pre-trained embeddings.
remove_pretrained_embedding_params(params)
else:
if recover:
raise ConfigurationError(
f"--recover specified but serialization_dir ({serialization_dir}) "
"does not exist. There is nothing to recover from.")
os.makedirs(serialization_dir, exist_ok=True)
params.to_file(os.path.join(serialization_dir, CONFIG_NAME))
def load_archive(archive_file: str,
device=None,
weights_file: str = None) -> Archive:
"""
Instantiates an Archive from an archived `tar.gz` file.
Parameters
----------
archive_file: ``str``
The archive file to load the model from.
weights_file: ``str``, optional (default = None)
The weights file to use. If unspecified, weights.th in the archive_file will be used.
device: ``None`` or PyTorch device object.
"""
# redirect to the cache, if necessary
resolved_archive_file = cached_path(archive_file)
if resolved_archive_file == archive_file:
logger.info(f"loading archive file {archive_file}")
else:
logger.info(
f"loading archive file {archive_file} from cache at {resolved_archive_file}"
)
tempdir = None
if os.path.isdir(resolved_archive_file):
serialization_dir = resolved_archive_file
else:
# Extract archive to temp dir
tempdir = tempfile.mkdtemp()
logger.info(
f"extracting archive file {resolved_archive_file} to temp dir {tempdir}"
)
with tarfile.open(resolved_archive_file, 'r:gz') as archive:
archive.extractall(tempdir)
serialization_dir = tempdir
# Load config
config = Params.from_file(os.path.join(serialization_dir, CONFIG_NAME))
config.loading_from_archive = True
if weights_file:
weights_path = weights_file
else:
weights_path = os.path.join(serialization_dir, _WEIGHTS_NAME)
# Instantiate model. Use a duplicate of the config, as it will get consumed.
model = Model.load(config,
weights_file=weights_path,
serialization_dir=serialization_dir,
device=device)
if tempdir:
# Clean up temp dir
shutil.rmtree(tempdir)
return Archive(model=model, config=config)
def pop_max_vocab_size(params: Params) -> Union[int, Dict[str, int]]:
"""
max_vocab_size is allowed to be either an int or a Dict[str, int] (or nothing).
But it could also be a string representing an int (in the case of environment variable
substitution). So we need some complex logic to handle it.
"""
size = params.pop("max_vocab_size", None)
if isinstance(size, Params):
# This is the Dict[str, int] case.
return size.as_dict()
elif size is not None:
# This is the int / str case.
try:
return int(size)
except:
return size
else:
return None
def train_model(params: Params):
"""
Trains the model specified in the given :class:`Params` object, using the data and training
parameters also specified in that object, and saves the results.
Parameters
----------
params : ``Params``
A parameter object specifying an AllenNLP Experiment.
Returns
-------
best_model: ``Model``
The model with the best epoch weights.
"""
# Set up the environment.
environment_params = params['environment']
environment.set_seed(environment_params)
create_serialization_dir(params)
environment.prepare_global_logging(environment_params)
#environment.check_for_gpu(environment_params)
#if environment_params['gpu']:
# device = torch.device('cuda:{}'.format(environment_params['cuda_device']))
# environment.occupy_gpu(device)
#else:
# device = torch.device('cpu')
device = torch.device('cpu')
params['trainer']['device'] = device
# Load data.
data_params = params['data']
dataset = dataset_from_params(data_params)
train_data = dataset['train']
dev_data = dataset.get('dev')
test_data = dataset.get('test')
# Vocabulary and iterator are created here.
vocab_params = params.get('vocab', {})
vocab = Vocabulary.from_instances(instances=train_data, **vocab_params)
# Initializing the model can have side effect of expanding the vocabulary
vocab.save_to_files(os.path.join(environment_params['serialization_dir'], "vocabulary"))
train_iterator, dev_iterater, test_iterater = iterator_from_params(vocab, data_params['iterator'])
# Build the model.
model_params = params['model']
model = getattr(Models, model_params['model_type']).from_params(vocab, model_params)
logger.info(model)
# Train
trainer_params = params['trainer']
no_grad_regexes = trainer_params['no_grad']
for name, parameter in model.named_parameters():
if any(re.search(regex, name) for regex in no_grad_regexes):
parameter.requires_grad_(False)
frozen_parameter_names, tunable_parameter_names = \
environment.get_frozen_and_tunable_parameter_names(model)
logger.info("Following parameters are Frozen (without gradient):")
for name in frozen_parameter_names:
logger.info(name)
logger.info("Following parameters are Tunable (with gradient):")
for name in tunable_parameter_names:
logger.info(name)
trainer = Trainer.from_params(model, train_data, dev_data, train_iterator, dev_iterater, trainer_params)
serialization_dir = trainer_params['serialization_dir']
try:
metrics = trainer.train()
except KeyboardInterrupt:
# if we have completed an epoch, try to create a model archive.
if os.path.exists(os.path.join(serialization_dir, _DEFAULT_WEIGHTS)):
logger.info("Training interrupted by the user. Attempting to create "
"a model archive using the current best epoch weights.")
archive_model(serialization_dir)
raise
# Now tar up results
archive_model(serialization_dir)
logger.info("Loading the best epoch weights.")
best_model_state_path = os.path.join(serialization_dir, 'best.th')
best_model_state = torch.load(best_model_state_path)
best_model = model
if not isinstance(best_model, torch.nn.DataParallel):
best_model_state = {re.sub(r'^module\.', '', k):v for k, v in best_model_state.items()}
best_model.load_state_dict(best_model_state)
return best_model
# if we have completed an epoch, try to create a model archive.
if os.path.exists(os.path.join(serialization_dir, _DEFAULT_WEIGHTS)):
logger.info("Training interrupted by the user. Attempting to create "
"a model archive using the current best epoch weights.")
archive_model(serialization_dir)
raise
# Now tar up results
archive_model(serialization_dir)
logger.info("Loading the best epoch weights.")
best_model_state_path = os.path.join(serialization_dir, 'best.th')
best_model_state = torch.load(best_model_state_path)
best_model = model
if not isinstance(best_model, torch.nn.DataParallel):
best_model_state = {re.sub(r'^module\.', '', k):v for k, v in best_model_state.items()}
best_model.load_state_dict(best_model_state)
return best_model
if __name__ == "__main__":
parser = argparse.ArgumentParser('train.py')
parser.add_argument('params', help='Parameters YAML file.')
args = parser.parse_args()
params = Params.from_file(args.params)
logger.info(params)
train_model(params)
def create_kwargs(cls: Type[T], params: Params, **extras) -> Dict[str, Any]:
"""
Given some class, a `Params` object, and potentially other keyword arguments,
create a dict of keyword args suitable for passing to the class's constructor.
The function does this by finding the class's constructor, matching the constructor
arguments to entries in the `params` object, and instantiating values for the parameters
using the type annotation and possibly a from_params method.
Any values that are provided in the `extras` will just be used as is.
For instance, you might provide an existing `Vocabulary` this way.
"""
# Get the signature of the constructor.
signature = inspect.signature(cls.__init__)
kwargs: Dict[str, Any] = {}
# Iterate over all the constructor parameters and their annotations.
for name, param in signature.parameters.items():
# Skip "self". You're not *required* to call the first parameter "self",
# so in theory this logic is fragile, but if you don't call the self parameter
# "self" you kind of deserve what happens.
if name == "self":
continue
# If the annotation is a compound type like typing.Dict[str, int],
# it will have an __origin__ field indicating `typing.Dict`
# and an __args__ field indicating `(str, int)`. We capture both.
annotation = remove_optional(param.annotation)
origin = getattr(annotation, '__origin__', None)
args = getattr(annotation, '__args__', [])
# The parameter is optional if its default value is not the "no default" sentinel.
default = param.default
optional = default != _NO_DEFAULT
# Some constructors expect extra non-parameter items, e.g. vocab: Vocabulary.
# We check the provided `extras` for these and just use them if they exist.
if name in extras:
kwargs[name] = extras[name]
# The next case is when the parameter type is itself constructible from_params.
elif hasattr(annotation, 'from_params'):
if name in params:
# Our params have an entry for this, so we use that.
subparams = params.pop(name)
if takes_arg(annotation.from_params, 'extras'):
# If annotation.params accepts **extras, we need to pass them all along.
# For example, `BasicTextFieldEmbedder.from_params` requires a Vocabulary
# object, but `TextFieldEmbedder.from_params` does not.
subextras = extras
else:
# Otherwise, only supply the ones that are actual args; any additional ones
# will cause a TypeError.
subextras = {
k: v
for k, v in extras.items()
if takes_arg(annotation.from_params, k)
}
# In some cases we allow a string instead of a param dict, so
# we need to handle that case separately.
if isinstance(subparams, str):
kwargs[name] = annotation.by_name(subparams)()
else:
kwargs[name] = annotation.from_params(params=subparams,
**subextras)
elif not optional:
# Not optional and not supplied, that's an error!
raise ConfigurationError(
f"expected key {name} for {cls.__name__}")
else:
kwargs[name] = default
# If the parameter type is a Python primitive, just pop it off
# using the correct casting pop_xyz operation.
elif annotation == str:
kwargs[name] = (params.pop(name, default)
if optional else params.pop(name))
elif annotation == int:
kwargs[name] = (params.pop_int(name, default)
if optional else params.pop_int(name))
elif annotation == bool:
kwargs[name] = (params.pop_bool(name, default)
if optional else params.pop_bool(name))
elif annotation == float:
kwargs[name] = (params.pop_float(name, default)
if optional else params.pop_float(name))
# This is special logic for handling types like Dict[str, TokenIndexer], which it creates by
# instantiating each value from_params and returning the resulting dict.
elif origin in (Dict, dict) and len(args) == 2 and hasattr(
args[-1], 'from_params'):
value_cls = annotation.__args__[-1]
value_dict = {}
for key, value_params in params.pop(name, Params({})).items():
value_dict[key] = value_cls.from_params(params=value_params,
**extras)
kwargs[name] = value_dict
else:
# Pass it on as is and hope for the best. ¯\_(ツ)_/¯
if optional:
kwargs[name] = params.pop(name, default)
else:
kwargs[name] = params.pop(name)
params.assert_empty(cls.__name__)
return kwargs
def from_params(cls: Type[T], params: Params, **extras) -> T:
"""
This is the automatic implementation of `from_params`. Any class that subclasses `FromParams`
(or `Registrable`, which itself subclasses `FromParams`) gets this implementation for free.
If you want your class to be instantiated from params in the "obvious" way -- pop off parameters
and hand them to your constructor with the same names -- this provides that functionality.
If you need more complex logic in your from `from_params` method, you'll have to implement
your own method that overrides this one.
"""
# pylint: disable=protected-access
from stog.utils.registrable import Registrable # import here to avoid circular imports
logger.info(
f"instantiating class {cls} from params {getattr(params, 'params', params)} "
f"and extras {extras}")
if params is None:
return None
registered_subclasses = Registrable._registry.get(cls)
if registered_subclasses is not None:
# We know ``cls`` inherits from Registrable, so we'll use a cast to make mypy happy.
# We have to use a disable to make pylint happy.
# pylint: disable=no-member
as_registrable = cast(Type[Registrable], cls)
default_to_first_choice = as_registrable.default_implementation is not None
choice = params.pop_choice(
"type",
choices=as_registrable.list_available(),
default_to_first_choice=default_to_first_choice)
subclass = registered_subclasses[choice]
# We want to call subclass.from_params. It's possible that it's just the "free"
# implementation here, in which case it accepts `**extras` and we are not able
# to make any assumptions about what extra parameters it needs.
#
# It's also possible that it has a custom `from_params` method. In that case it
# won't accept any **extra parameters and we'll need to filter them out.
if not takes_arg(subclass.from_params, 'extras'):
# Necessarily subclass.from_params is a custom implementation, so we need to
# pass it only the args it's expecting.
extras = {
k: v
for k, v in extras.items()
if takes_arg(subclass.from_params, k)
}
return subclass.from_params(params=params, **extras)
else:
# This is not a base class, so convert our params and extras into a dict of kwargs.
if cls.__init__ == object.__init__:
# This class does not have an explicit constructor, so don't give it any kwargs.
# Without this logic, create_kwargs will look at object.__init__ and see that
# it takes *args and **kwargs and look for those.
kwargs: Dict[str, Any] = {}
else:
# This class has a constructor, so create kwargs for it.
kwargs = create_kwargs(cls, params, **extras)
return cls(**kwargs) # type: ignore
def from_params(cls, params: Params, instances: Iterable['adi.Instance'] = None): # type: ignore
"""
There are two possible ways to build a vocabulary; from a
collection of instances, using :func:`Vocabulary.from_instances`, or
from a pre-saved vocabulary, using :func:`Vocabulary.from_files`.
You can also extend pre-saved vocabulary with collection of instances
using this method. This method wraps these options, allowing their
specification from a ``Params`` object, generated from a JSON
configuration file.
Parameters
----------
params: Params, required.
instances: Iterable['adi.Instance'], optional
If ``params`` doesn't contain a ``directory_path`` key,
the ``Vocabulary`` can be built directly from a collection of
instances (i.e. a dataset). If ``extend`` key is set False,
dataset instances will be ignored and final vocabulary will be
one loaded from ``directory_path``. If ``extend`` key is set True,
dataset instances will be used to extend the vocabulary loaded
from ``directory_path`` and that will be final vocabulary used.
Returns
-------
A ``Vocabulary``.
"""
# pylint: disable=arguments-differ
# Vocabulary is ``Registrable`` so that you can configure a custom subclass,
# but (unlike most of our registrables) almost everyone will want to use the
# base implementation. So instead of having an abstract ``VocabularyBase`` or
# such, we just add the logic for instantiating a registered subclass here,
# so that most users can continue doing what they were doing.
vocab_type = params.pop("type", None)
if vocab_type is not None:
return cls.by_name(vocab_type).from_params(params=params, instances=instances)
extend = params.pop("extend", False)
vocabulary_directory = params.pop("directory_path", None)
if not vocabulary_directory and not instances:
raise ConfigurationError("You must provide either a Params object containing a "
"vocab_directory key or a Dataset to build a vocabulary from.")
if extend and not instances:
raise ConfigurationError("'extend' is true but there are not instances passed to extend.")
if extend and not vocabulary_directory:
raise ConfigurationError("'extend' is true but there is not 'directory_path' to extend from.")
if vocabulary_directory and instances:
if extend:
logger.info("Loading Vocab from files and extending it with dataset.")
else:
logger.info("Loading Vocab from files instead of dataset.")
if vocabulary_directory:
vocab = Vocabulary.from_files(vocabulary_directory)
if not extend:
params.assert_empty("Vocabulary - from files")
return vocab
if extend:
vocab.extend_from_instances(params, instances=instances)
return vocab
min_count = params.pop("min_count", None)
max_vocab_size = pop_max_vocab_size(params)
non_padded_namespaces = params.pop("non_padded_namespaces", DEFAULT_NON_PADDED_NAMESPACES)
pretrained_files = params.pop("pretrained_files", {})
min_pretrained_embeddings = params.pop("min_pretrained_embeddings", None)
only_include_pretrained_words = params.pop_bool("only_include_pretrained_words", False)
tokens_to_add = params.pop("tokens_to_add", None)
params.assert_empty("Vocabulary - from dataset")
return Vocabulary.from_instances(instances=instances,
min_count=min_count,
max_vocab_size=max_vocab_size,
non_padded_namespaces=non_padded_namespaces,
pretrained_files=pretrained_files,
only_include_pretrained_words=only_include_pretrained_words,
tokens_to_add=tokens_to_add,
min_pretrained_embeddings=min_pretrained_embeddings)
