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# coding=utf-8
# 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 unittest
import torch
from diffusers import (
Lumina2Transformer2DModel,
)
from diffusers.utils.testing_utils import (
backend_empty_cache,
enable_full_determinism,
require_torch_accelerator,
torch_device,
)
enable_full_determinism()
@require_torch_accelerator
class Lumina2Transformer2DModelSingleFileTests(unittest.TestCase):
model_class = Lumina2Transformer2DModel
ckpt_path = "https://huggingface.co/Comfy-Org/Lumina_Image_2.0_Repackaged/blob/main/split_files/diffusion_models/lumina_2_model_bf16.safetensors"
alternate_keys_ckpt_paths = [
"https://huggingface.co/Comfy-Org/Lumina_Image_2.0_Repackaged/blob/main/split_files/diffusion_models/lumina_2_model_bf16.safetensors"
]
repo_id = "Alpha-VLLM/Lumina-Image-2.0"
def setUp(self):
super().setUp()
gc.collect()
backend_empty_cache(torch_device)
def tearDown(self):
super().tearDown()
gc.collect()
backend_empty_cache(torch_device)
def test_single_file_components(self):
model = self.model_class.from_pretrained(self.repo_id, subfolder="transformer")
model_single_file = self.model_class.from_single_file(self.ckpt_path)
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_checkpoint_loading(self):
for ckpt_path in self.alternate_keys_ckpt_paths:
torch.cuda.empty_cache()
model = self.model_class.from_single_file(ckpt_path)
del model
gc.collect()
torch.cuda.empty_cache()
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