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# Copyright 2025 HuggingFace Inc.
#
# 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.
import gc
import torch
from diffusers import StableCascadeUNet
from diffusers.utils import logging
from ..testing_utils import (
backend_empty_cache,
enable_full_determinism,
require_torch_accelerator,
slow,
torch_device,
)
logger = logging.get_logger(__name__)
enable_full_determinism()
@slow
@require_torch_accelerator
class StableCascadeUNetSingleFileTest:
def setup_method(self):
gc.collect()
backend_empty_cache(torch_device)
def teardown_method(self):
gc.collect()
backend_empty_cache(torch_device)
def test_single_file_components_stage_b(self):
model_single_file = StableCascadeUNet.from_single_file(
"https://huggingface.co/stabilityai/stable-cascade/blob/main/stage_b_bf16.safetensors",
torch_dtype=torch.bfloat16,
)
model = StableCascadeUNet.from_pretrained(
"stabilityai/stable-cascade", variant="bf16", subfolder="decoder", use_safetensors=True
)
PARAMS_TO_IGNORE = ["torch_dtype", "_name_or_path", "_use_default_values", "_diffusers_version"]
for param_name, param_value in model_single_file.config.items():
if param_name in PARAMS_TO_IGNORE:
continue
assert model.config[param_name] == param_value, (
f"{param_name} differs between single file loading and pretrained loading"
)
def test_single_file_components_stage_b_lite(self):
model_single_file = StableCascadeUNet.from_single_file(
"https://huggingface.co/stabilityai/stable-cascade/blob/main/stage_b_lite_bf16.safetensors",
torch_dtype=torch.bfloat16,
)
model = StableCascadeUNet.from_pretrained(
"stabilityai/stable-cascade", variant="bf16", subfolder="decoder_lite"
)
PARAMS_TO_IGNORE = ["torch_dtype", "_name_or_path", "_use_default_values", "_diffusers_version"]
for param_name, param_value in model_single_file.config.items():
if param_name in PARAMS_TO_IGNORE:
continue
assert model.config[param_name] == param_value, (
f"{param_name} differs between single file loading and pretrained loading"
)
def test_single_file_components_stage_c(self):
model_single_file = StableCascadeUNet.from_single_file(
"https://huggingface.co/stabilityai/stable-cascade/blob/main/stage_c_bf16.safetensors",
torch_dtype=torch.bfloat16,
)
model = StableCascadeUNet.from_pretrained(
"stabilityai/stable-cascade-prior", variant="bf16", subfolder="prior"
)
PARAMS_TO_IGNORE = ["torch_dtype", "_name_or_path", "_use_default_values", "_diffusers_version"]
for param_name, param_value in model_single_file.config.items():
if param_name in PARAMS_TO_IGNORE:
continue
assert model.config[param_name] == param_value, (
f"{param_name} differs between single file loading and pretrained loading"
)
def test_single_file_components_stage_c_lite(self):
model_single_file = StableCascadeUNet.from_single_file(
"https://huggingface.co/stabilityai/stable-cascade/blob/main/stage_c_lite_bf16.safetensors",
torch_dtype=torch.bfloat16,
)
model = StableCascadeUNet.from_pretrained(
"stabilityai/stable-cascade-prior", variant="bf16", subfolder="prior_lite"
)
PARAMS_TO_IGNORE = ["torch_dtype", "_name_or_path", "_use_default_values", "_diffusers_version"]
for param_name, param_value in model_single_file.config.items():
if param_name in PARAMS_TO_IGNORE:
continue
assert model.config[param_name] == param_value, (
f"{param_name} differs between single file loading and pretrained loading"
)
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