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# Copyright 2022 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Generic utilities
"""
import inspect
import tempfile
from collections import OrderedDict, UserDict
from collections.abc import MutableMapping
from contextlib import ExitStack, contextmanager
from dataclasses import fields, is_dataclass
from enum import Enum
from typing import Any, ContextManager, List, Tuple
import numpy as np
from .import_utils import is_flax_available, is_tf_available, is_torch_available, is_torch_fx_proxy
if is_flax_available():
import jax.numpy as jnp
class cached_property(property):
"""
Descriptor that mimics @property but caches output in member variable.
From tensorflow_datasets
Built-in in functools from Python 3.8.
"""
def __get__(self, obj, objtype=None):
# See docs.python.org/3/howto/descriptor.html#properties
if obj is None:
return self
if self.fget is None:
raise AttributeError("unreadable attribute")
attr = "__cached_" + self.fget.__name__
cached = getattr(obj, attr, None)
if cached is None:
cached = self.fget(obj)
setattr(obj, attr, cached)
return cached
# vendored from distutils.util
def strtobool(val):
"""Convert a string representation of truth to true (1) or false (0).
True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values are 'n', 'no', 'f', 'false', 'off', and '0'.
Raises ValueError if 'val' is anything else.
"""
val = val.lower()
if val in {"y", "yes", "t", "true", "on", "1"}:
return 1
if val in {"n", "no", "f", "false", "off", "0"}:
return 0
raise ValueError(f"invalid truth value {val!r}")
def infer_framework_from_repr(x):
"""
Tries to guess the framework of an object `x` from its repr (brittle but will help in `is_tensor` to try the
frameworks in a smart order, without the need to import the frameworks).
"""
representation = str(type(x))
if representation.startswith("<class 'torch."):
return "pt"
elif representation.startswith("<class 'tensorflow."):
return "tf"
elif representation.startswith("<class 'jax"):
return "jax"
elif representation.startswith("<class 'numpy."):
return "np"
def _get_frameworks_and_test_func(x):
"""
Returns an (ordered since we are in Python 3.7+) dictionary framework to test function, which places the framework
we can guess from the repr first, then Numpy, then the others.
"""
framework_to_test = {
"pt": is_torch_tensor,
"tf": is_tf_tensor,
"jax": is_jax_tensor,
"np": is_numpy_array,
}
preferred_framework = infer_framework_from_repr(x)
# We will test this one first, then numpy, then the others.
frameworks = [] if preferred_framework is None else [preferred_framework]
if preferred_framework != "np":
frameworks.append("np")
frameworks.extend([f for f in framework_to_test if f not in [preferred_framework, "np"]])
return {f: framework_to_test[f] for f in frameworks}
def is_tensor(x):
"""
Tests if `x` is a `torch.Tensor`, `tf.Tensor`, `jaxlib.xla_extension.DeviceArray` or `np.ndarray` in the order
defined by `infer_framework_from_repr`
"""
# This gives us a smart order to test the frameworks with the corresponding tests.
framework_to_test_func = _get_frameworks_and_test_func(x)
for test_func in framework_to_test_func.values():
if test_func(x):
return True
# Tracers
if is_torch_fx_proxy(x):
return True
if is_flax_available():
from jax.core import Tracer
if isinstance(x, Tracer):
return True
return False
def _is_numpy(x):
return isinstance(x, np.ndarray)
def is_numpy_array(x):
"""
Tests if `x` is a numpy array or not.
"""
return _is_numpy(x)
def _is_torch(x):
import torch
return isinstance(x, torch.Tensor)
def is_torch_tensor(x):
"""
Tests if `x` is a torch tensor or not. Safe to call even if torch is not installed.
"""
return False if not is_torch_available() else _is_torch(x)
def _is_torch_device(x):
import torch
return isinstance(x, torch.device)
def is_torch_device(x):
"""
Tests if `x` is a torch device or not. Safe to call even if torch is not installed.
"""
return False if not is_torch_available() else _is_torch_device(x)
def _is_torch_dtype(x):
import torch
if isinstance(x, str):
if hasattr(torch, x):
x = getattr(torch, x)
else:
return False
return isinstance(x, torch.dtype)
def is_torch_dtype(x):
"""
Tests if `x` is a torch dtype or not. Safe to call even if torch is not installed.
"""
return False if not is_torch_available() else _is_torch_dtype(x)
def _is_tensorflow(x):
import tensorflow as tf
return isinstance(x, tf.Tensor)
def is_tf_tensor(x):
"""
Tests if `x` is a tensorflow tensor or not. Safe to call even if tensorflow is not installed.
"""
return False if not is_tf_available() else _is_tensorflow(x)
def _is_tf_symbolic_tensor(x):
import tensorflow as tf
# the `is_symbolic_tensor` predicate is only available starting with TF 2.14
if hasattr(tf, "is_symbolic_tensor"):
return tf.is_symbolic_tensor(x)
return type(x) == tf.Tensor
def is_tf_symbolic_tensor(x):
"""
Tests if `x` is a tensorflow symbolic tensor or not (ie. not eager). Safe to call even if tensorflow is not
installed.
"""
return False if not is_tf_available() else _is_tf_symbolic_tensor(x)
def _is_jax(x):
import jax.numpy as jnp # noqa: F811
return isinstance(x, jnp.ndarray)
def is_jax_tensor(x):
"""
Tests if `x` is a Jax tensor or not. Safe to call even if jax is not installed.
"""
return False if not is_flax_available() else _is_jax(x)
def to_py_obj(obj):
"""
Convert a TensorFlow tensor, PyTorch tensor, Numpy array or python list to a python list.
"""
framework_to_py_obj = {
"pt": lambda obj: obj.detach().cpu().tolist(),
"tf": lambda obj: obj.numpy().tolist(),
"jax": lambda obj: np.asarray(obj).tolist(),
"np": lambda obj: obj.tolist(),
}
if isinstance(obj, (dict, UserDict)):
return {k: to_py_obj(v) for k, v in obj.items()}
elif isinstance(obj, (list, tuple)):
return [to_py_obj(o) for o in obj]
# This gives us a smart order to test the frameworks with the corresponding tests.
framework_to_test_func = _get_frameworks_and_test_func(obj)
for framework, test_func in framework_to_test_func.items():
if test_func(obj):
return framework_to_py_obj[framework](obj)
# tolist also works on 0d np arrays
if isinstance(obj, np.number):
return obj.tolist()
else:
return obj
def to_numpy(obj):
"""
Convert a TensorFlow tensor, PyTorch tensor, Numpy array or python list to a Numpy array.
"""
framework_to_numpy = {
"pt": lambda obj: obj.detach().cpu().numpy(),
"tf": lambda obj: obj.numpy(),
"jax": lambda obj: np.asarray(obj),
"np": lambda obj: obj,
}
if isinstance(obj, (dict, UserDict)):
return {k: to_numpy(v) for k, v in obj.items()}
elif isinstance(obj, (list, tuple)):
return np.array(obj)
# This gives us a smart order to test the frameworks with the corresponding tests.
framework_to_test_func = _get_frameworks_and_test_func(obj)
for framework, test_func in framework_to_test_func.items():
if test_func(obj):
return framework_to_numpy[framework](obj)
return obj
class ModelOutput(OrderedDict):
"""
Base class for all model outputs as dataclass. Has a `__getitem__` that allows indexing by integer or slice (like a
tuple) or strings (like a dictionary) that will ignore the `None` attributes. Otherwise behaves like a regular
python dictionary.
<Tip warning={true}>
You can't unpack a `ModelOutput` directly. Use the [`~utils.ModelOutput.to_tuple`] method to convert it to a tuple
before.
</Tip>
"""
def __init_subclass__(cls) -> None:
"""Register subclasses as pytree nodes.
This is necessary to synchronize gradients when using `torch.nn.parallel.DistributedDataParallel` with
`static_graph=True` with modules that output `ModelOutput` subclasses.
"""
if is_torch_available():
import torch.utils._pytree
torch.utils._pytree._register_pytree_node(
cls,
torch.utils._pytree._dict_flatten,
lambda values, context: cls(**torch.utils._pytree._dict_unflatten(values, context)),
)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Subclasses of ModelOutput must use the @dataclass decorator
# This check is done in __init__ because the @dataclass decorator operates after __init_subclass__
# issubclass() would return True for issubclass(ModelOutput, ModelOutput) when False is needed
# Just need to check that the current class is not ModelOutput
is_modeloutput_subclass = self.__class__ != ModelOutput
if is_modeloutput_subclass and not is_dataclass(self):
raise TypeError(
f"{self.__module__}.{self.__class__.__name__} is not a dataclasss."
" This is a subclass of ModelOutput and so must use the @dataclass decorator."
)
def __post_init__(self):
"""Check the ModelOutput dataclass.
Only occurs if @dataclass decorator has been used.
"""
class_fields = fields(self)
# Safety and consistency checks
if not len(class_fields):
raise ValueError(f"{self.__class__.__name__} has no fields.")
if not all(field.default is None for field in class_fields[1:]):
raise ValueError(f"{self.__class__.__name__} should not have more than one required field.")
first_field = getattr(self, class_fields[0].name)
other_fields_are_none = all(getattr(self, field.name) is None for field in class_fields[1:])
if other_fields_are_none and not is_tensor(first_field):
if isinstance(first_field, dict):
iterator = first_field.items()
first_field_iterator = True
else:
try:
iterator = iter(first_field)
first_field_iterator = True
except TypeError:
first_field_iterator = False
# if we provided an iterator as first field and the iterator is a (key, value) iterator
# set the associated fields
if first_field_iterator:
for idx, element in enumerate(iterator):
if (
not isinstance(element, (list, tuple))
or not len(element) == 2
or not isinstance(element[0], str)
):
if idx == 0:
# If we do not have an iterator of key/values, set it as attribute
self[class_fields[0].name] = first_field
else:
# If we have a mixed iterator, raise an error
raise ValueError(
f"Cannot set key/value for {element}. It needs to be a tuple (key, value)."
)
break
setattr(self, element[0], element[1])
if element[1] is not None:
self[element[0]] = element[1]
elif first_field is not None:
self[class_fields[0].name] = first_field
else:
for field in class_fields:
v = getattr(self, field.name)
if v is not None:
self[field.name] = v
def __delitem__(self, *args, **kwargs):
raise Exception(f"You cannot use ``__delitem__`` on a {self.__class__.__name__} instance.")
def setdefault(self, *args, **kwargs):
raise Exception(f"You cannot use ``setdefault`` on a {self.__class__.__name__} instance.")
def pop(self, *args, **kwargs):
raise Exception(f"You cannot use ``pop`` on a {self.__class__.__name__} instance.")
def update(self, *args, **kwargs):
raise Exception(f"You cannot use ``update`` on a {self.__class__.__name__} instance.")
def __getitem__(self, k):
if isinstance(k, str):
inner_dict = dict(self.items())
return inner_dict[k]
else:
return self.to_tuple()[k]
def __setattr__(self, name, value):
if name in self.keys() and value is not None:
# Don't call self.__setitem__ to avoid recursion errors
super().__setitem__(name, value)
super().__setattr__(name, value)
def __setitem__(self, key, value):
# Will raise a KeyException if needed
super().__setitem__(key, value)
# Don't call self.__setattr__ to avoid recursion errors
super().__setattr__(key, value)
def __reduce__(self):
if not is_dataclass(self):
return super().__reduce__()
callable, _args, *remaining = super().__reduce__()
args = tuple(getattr(self, field.name) for field in fields(self))
return callable, args, *remaining
def to_tuple(self) -> Tuple[Any]:
"""
Convert self to a tuple containing all the attributes/keys that are not `None`.
"""
return tuple(self[k] for k in self.keys())
class ExplicitEnum(str, Enum):
"""
Enum with more explicit error message for missing values.
"""
@classmethod
def _missing_(cls, value):
raise ValueError(
f"{value} is not a valid {cls.__name__}, please select one of {list(cls._value2member_map_.keys())}"
)
class PaddingStrategy(ExplicitEnum):
"""
Possible values for the `padding` argument in [`PreTrainedTokenizerBase.__call__`]. Useful for tab-completion in an
IDE.
"""
LONGEST = "longest"
MAX_LENGTH = "max_length"
DO_NOT_PAD = "do_not_pad"
class TensorType(ExplicitEnum):
"""
Possible values for the `return_tensors` argument in [`PreTrainedTokenizerBase.__call__`]. Useful for
tab-completion in an IDE.
"""
PYTORCH = "pt"
TENSORFLOW = "tf"
NUMPY = "np"
JAX = "jax"
class ContextManagers:
"""
Wrapper for `contextlib.ExitStack` which enters a collection of context managers. Adaptation of `ContextManagers`
in the `fastcore` library.
"""
def __init__(self, context_managers: List[ContextManager]):
self.context_managers = context_managers
self.stack = ExitStack()
def __enter__(self):
for context_manager in self.context_managers:
self.stack.enter_context(context_manager)
def __exit__(self, *args, **kwargs):
self.stack.__exit__(*args, **kwargs)
def can_return_loss(model_class):
"""
Check if a given model can return loss.
Args:
model_class (`type`): The class of the model.
"""
framework = infer_framework(model_class)
if framework == "tf":
signature = inspect.signature(model_class.call) # TensorFlow models
elif framework == "pt":
signature = inspect.signature(model_class.forward) # PyTorch models
else:
signature = inspect.signature(model_class.__call__) # Flax models
for p in signature.parameters:
if p == "return_loss" and signature.parameters[p].default is True:
return True
return False
def find_labels(model_class):
"""
Find the labels used by a given model.
Args:
model_class (`type`): The class of the model.
"""
model_name = model_class.__name__
framework = infer_framework(model_class)
if framework == "tf":
signature = inspect.signature(model_class.call) # TensorFlow models
elif framework == "pt":
signature = inspect.signature(model_class.forward) # PyTorch models
else:
signature = inspect.signature(model_class.__call__) # Flax models
if "QuestionAnswering" in model_name:
return [p for p in signature.parameters if "label" in p or p in ("start_positions", "end_positions")]
else:
return [p for p in signature.parameters if "label" in p]
def flatten_dict(d: MutableMapping, parent_key: str = "", delimiter: str = "."):
"""Flatten a nested dict into a single level dict."""
def _flatten_dict(d, parent_key="", delimiter="."):
for k, v in d.items():
key = str(parent_key) + delimiter + str(k) if parent_key else k
if v and isinstance(v, MutableMapping):
yield from flatten_dict(v, key, delimiter=delimiter).items()
else:
yield key, v
return dict(_flatten_dict(d, parent_key, delimiter))
@contextmanager
def working_or_temp_dir(working_dir, use_temp_dir: bool = False):
if use_temp_dir:
with tempfile.TemporaryDirectory() as tmp_dir:
yield tmp_dir
else:
yield working_dir
def transpose(array, axes=None):
"""
Framework-agnostic version of `numpy.transpose` that will work on torch/TensorFlow/Jax tensors as well as NumPy
arrays.
"""
if is_numpy_array(array):
return np.transpose(array, axes=axes)
elif is_torch_tensor(array):
return array.T if axes is None else array.permute(*axes)
elif is_tf_tensor(array):
import tensorflow as tf
return tf.transpose(array, perm=axes)
elif is_jax_tensor(array):
return jnp.transpose(array, axes=axes)
else:
raise ValueError(f"Type not supported for transpose: {type(array)}.")
def reshape(array, newshape):
"""
Framework-agnostic version of `numpy.reshape` that will work on torch/TensorFlow/Jax tensors as well as NumPy
arrays.
"""
if is_numpy_array(array):
return np.reshape(array, newshape)
elif is_torch_tensor(array):
return array.reshape(*newshape)
elif is_tf_tensor(array):
import tensorflow as tf
return tf.reshape(array, newshape)
elif is_jax_tensor(array):
return jnp.reshape(array, newshape)
else:
raise ValueError(f"Type not supported for reshape: {type(array)}.")
def squeeze(array, axis=None):
"""
Framework-agnostic version of `numpy.squeeze` that will work on torch/TensorFlow/Jax tensors as well as NumPy
arrays.
"""
if is_numpy_array(array):
return np.squeeze(array, axis=axis)
elif is_torch_tensor(array):
return array.squeeze() if axis is None else array.squeeze(dim=axis)
elif is_tf_tensor(array):
import tensorflow as tf
return tf.squeeze(array, axis=axis)
elif is_jax_tensor(array):
return jnp.squeeze(array, axis=axis)
else:
raise ValueError(f"Type not supported for squeeze: {type(array)}.")
def expand_dims(array, axis):
"""
Framework-agnostic version of `numpy.expand_dims` that will work on torch/TensorFlow/Jax tensors as well as NumPy
arrays.
"""
if is_numpy_array(array):
return np.expand_dims(array, axis)
elif is_torch_tensor(array):
return array.unsqueeze(dim=axis)
elif is_tf_tensor(array):
import tensorflow as tf
return tf.expand_dims(array, axis=axis)
elif is_jax_tensor(array):
return jnp.expand_dims(array, axis=axis)
else:
raise ValueError(f"Type not supported for expand_dims: {type(array)}.")
def tensor_size(array):
"""
Framework-agnostic version of `numpy.size` that will work on torch/TensorFlow/Jax tensors as well as NumPy arrays.
"""
if is_numpy_array(array):
return np.size(array)
elif is_torch_tensor(array):
return array.numel()
elif is_tf_tensor(array):
import tensorflow as tf
return tf.size(array)
elif is_jax_tensor(array):
return array.size
else:
raise ValueError(f"Type not supported for expand_dims: {type(array)}.")
def add_model_info_to_auto_map(auto_map, repo_id):
"""
Adds the information of the repo_id to a given auto map.
"""
for key, value in auto_map.items():
if isinstance(value, (tuple, list)):
auto_map[key] = [f"{repo_id}--{v}" if (v is not None and "--" not in v) else v for v in value]
elif value is not None and "--" not in value:
auto_map[key] = f"{repo_id}--{value}"
return auto_map
def infer_framework(model_class):
"""
Infers the framework of a given model without using isinstance(), because we cannot guarantee that the relevant
classes are imported or available.
"""
for base_class in inspect.getmro(model_class):
module = base_class.__module__
name = base_class.__name__
if module.startswith("tensorflow") or module.startswith("keras") or name == "TFPreTrainedModel":
return "tf"
elif module.startswith("torch") or name == "PreTrainedModel":
return "pt"
elif module.startswith("flax") or module.startswith("jax") or name == "FlaxPreTrainedModel":
return "flax"
else:
raise TypeError(f"Could not infer framework from class {model_class}.")
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