# Copyright (c) 2023, Teriks
#
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import typing
import diffusers
import huggingface_hub
import dgenerate.memoize as _d_memoize
import dgenerate.memory as _memory
import dgenerate.messages as _messages
import dgenerate.pipelinewrapper.cache as _cache
import dgenerate.pipelinewrapper.enums as _enums
import dgenerate.pipelinewrapper.hfutil as _hfutil
import dgenerate.textprocessing as _textprocessing
import dgenerate.types as _types
from dgenerate.memoize import memoize as _memoize
from dgenerate.pipelinewrapper.uris import exceptions as _exceptions
_flax_unet_uri_parser = _textprocessing.ConceptUriParser('UNet',
['revision', 'subfolder', 'dtype'])
[docs]
class FlaxUNetUri:
"""
Representation of ``--unet`` uri when ``--model-type`` flax*
"""
@property
def model(self) -> str:
"""
Model path, huggingface slug
"""
return self._model
@property
def revision(self) -> _types.OptionalString:
"""
Model repo revision
"""
return self._revision
@property
def subfolder(self) -> _types.OptionalPath:
"""
Model repo subfolder
"""
return self._subfolder
@property
def dtype(self) -> _enums.DataType | None:
"""
Model dtype (precision)
"""
return self._dtype
[docs]
def __init__(self,
model: str,
revision: _types.OptionalString,
subfolder: _types.OptionalPath,
dtype: _enums.DataType | None):
"""
:param model: model path
:param revision: model revision (branch name)
:param subfolder: model subfolder
:param dtype: model data type (precision)
:raises InvalidUNetUriError: If ``model`` points to a single file, single file loads are not supported, or
if ``dtype`` is passed an invalid string.
"""
single_file_load_path = _hfutil.is_single_file_model_load(model)
if single_file_load_path:
raise _exceptions.InvalidUNetUriError('Loading a UNet from a single file is not supported.')
self._model = model
self._revision = revision
try:
self._dtype = _enums.get_data_type_enum(dtype) if dtype else None
except ValueError:
raise _exceptions.InvalidUNetUriError(
f'invalid dtype string, must be one of: {_textprocessing.oxford_comma(_enums.supported_data_type_strings(), "or")}')
self._subfolder = subfolder
[docs]
def load(self,
dtype_fallback: _enums.DataType = _enums.DataType.AUTO,
use_auth_token: _types.OptionalString = None,
local_files_only: bool = False) -> tuple[diffusers.FlaxUNet2DConditionModel, typing.Any]:
"""
Load a :py:class:`diffusers.FlaxUNet2DConditionModel` UNet and its flax_params from this URI
:param dtype_fallback: If the URI does not specify a dtype, use this dtype.
:param use_auth_token: optional huggingface auth token.
:param local_files_only: avoid downloading files and only look for cached files
when the model path is a huggingface slug or blob link
:raises ModelNotFoundError: If the model could not be found.
:return: tuple (:py:class:`diffusers.FlaxUNet2DConditionModel`, flax_unet_params)
"""
try:
return self._load(dtype_fallback, use_auth_token, local_files_only)
except (huggingface_hub.utils.HFValidationError,
huggingface_hub.utils.HfHubHTTPError) as e:
raise _hfutil.ModelNotFoundError(e)
except Exception as e:
raise _exceptions.UNetUriLoadError(
f'error loading unet "{self.model}": {e}')
@_memoize(_cache._FLAX_UNET_CACHE,
exceptions={'local_files_only'},
hasher=lambda args: _d_memoize.args_cache_key(args, {'self': _d_memoize.struct_hasher}),
on_hit=lambda key, hit: _d_memoize.simple_cache_hit_debug("Flax UNet", key, hit[0]),
on_create=lambda key, new: _d_memoize.simple_cache_miss_debug("Flax UNet", key, new[0]))
def _load(self,
dtype_fallback: _enums.DataType = _enums.DataType.AUTO,
use_auth_token: _types.OptionalString = None,
local_files_only: bool = False) -> tuple[diffusers.FlaxUNet2DConditionModel, typing.Any]:
if self.dtype is None:
flax_dtype = _enums.get_flax_dtype(dtype_fallback)
else:
flax_dtype = _enums.get_flax_dtype(self.dtype)
estimated_memory_use = _hfutil.estimate_model_memory_use(
repo_id=self.model,
revision=self.revision,
subfolder=self.subfolder,
local_files_only=local_files_only,
use_auth_token=use_auth_token,
flax=True
)
_cache.enforce_unet_cache_constraints(new_unet_size=estimated_memory_use)
unet = diffusers.FlaxUNet2DConditionModel.from_pretrained(
self.model,
revision=self.revision,
dtype=flax_dtype,
subfolder=self.subfolder,
token=use_auth_token,
local_files_only=local_files_only)
_messages.debug_log('Estimated Flax UNet Memory Use:',
_memory.bytes_best_human_unit(estimated_memory_use))
_cache.unet_create_update_cache_info(unet=unet[0],
estimated_size=estimated_memory_use)
return unet
[docs]
@staticmethod
def parse(uri: _types.Uri) -> 'FlaxUNetUri':
"""
Parse a ``--model-type`` flax* ``--unet`` uri and return an object representing its constituents
:param uri: string with ``--unet`` uri syntax
:raise InvalidUNetUriError:
:return: :py:class:`.FlaxUNetUri`
"""
try:
r = _flax_unet_uri_parser.parse(uri)
dtype = r.args.get('dtype')
supported_dtypes = _enums.supported_data_type_strings()
if dtype is not None and dtype not in supported_dtypes:
raise _exceptions.InvalidUNetUriError(
f'Flax UNet "dtype" must be {", ".join(supported_dtypes)}, '
f'or left undefined, received: {dtype}')
return FlaxUNetUri(
model=r.concept,
revision=r.args.get('revision', None),
dtype=_enums.get_flax_dtype(dtype),
subfolder=r.args.get('subfolder', None))
except _textprocessing.ConceptUriParseError as e:
raise _exceptions.InvalidUNetUriError(e)