Fix bug when variant and safetensor file does not match (#11587)

kaixuanliu · github-actions[bot] · web-flow · commit b5c2050a16f7 · 2025-05-26T14:18:41.000+05:30
* Apply style fixes

* init test

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* adjust

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* add the variant check when there are no component folders

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* update related test cases

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* update related unit test cases

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* adjust

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;

* Apply style fixes

---------

Signed-off-by: Liu, Kaixuan &lt;kaixuan.liu@intel.com&gt;
Co-authored-by: github-actions[bot] &lt;github-actions[bot]@users.noreply.github.com&gt;
diff --git a/src/diffusers/pipelines/pipeline_loading_utils.py b/src/diffusers/pipelines/pipeline_loading_utils.py
@@ -92,7 +92,7 @@
     ALL_IMPORTABLE_CLASSES.update(LOADABLE_CLASSES[library])
 
 
-def is_safetensors_compatible(filenames, passed_components=None, folder_names=None) -> bool:
+def is_safetensors_compatible(filenames, passed_components=None, folder_names=None, variant=None) -> bool:
     """
     Checking for safetensors compatibility:
     - The model is safetensors compatible only if there is a safetensors file for each model component present in
@@ -103,6 +103,31 @@ def is_safetensors_compatible(filenames, passed_components=None, folder_names=No
     - For models from the transformers library, the filename changes from "pytorch_model" to "model", and the ".bin"
       extension is replaced with ".safetensors"
     """
+    weight_names = [
+        WEIGHTS_NAME,
+        SAFETENSORS_WEIGHTS_NAME,
+        FLAX_WEIGHTS_NAME,
+        ONNX_WEIGHTS_NAME,
+        ONNX_EXTERNAL_WEIGHTS_NAME,
+    ]
+
+    if is_transformers_available():
+        weight_names += [TRANSFORMERS_WEIGHTS_NAME, TRANSFORMERS_SAFE_WEIGHTS_NAME, TRANSFORMERS_FLAX_WEIGHTS_NAME]
+
+    # model_pytorch, diffusion_model_pytorch, ...
+    weight_prefixes = [w.split(".")[0] for w in weight_names]
+    # .bin, .safetensors, ...
+    weight_suffixs = [w.split(".")[-1] for w in weight_names]
+    # -00001-of-00002
+    transformers_index_format = r"\d{5}-of-\d{5}"
+    # `diffusion_pytorch_model.bin` as well as `model-00001-of-00002.safetensors`
+    variant_file_re = re.compile(
+        rf"({'|'.join(weight_prefixes)})\.({variant}|{variant}-{transformers_index_format})\.({'|'.join(weight_suffixs)})$"
+    )
+    non_variant_file_re = re.compile(
+        rf"({'|'.join(weight_prefixes)})(-{transformers_index_format})?\.({'|'.join(weight_suffixs)})$"
+    )
+
     passed_components = passed_components or []
     if folder_names:
         filenames = {f for f in filenames if os.path.split(f)[0] in folder_names}
@@ -122,14 +147,22 @@ def is_safetensors_compatible(filenames, passed_components=None, folder_names=No
 
     # If there are no component folders check the main directory for safetensors files
     if not components:
-        return any(".safetensors" in filename for filename in filenames)
+        if variant is not None:
+            filtered_filenames = filter_with_regex(filenames, variant_file_re)
+        else:
+            filtered_filenames = filter_with_regex(filenames, non_variant_file_re)
+        return any(".safetensors" in filename for filename in filtered_filenames)
 
     # iterate over all files of a component
     # check if safetensor files exist for that component
     # if variant is provided check if the variant of the safetensors exists
     for component, component_filenames in components.items():
         matches = []
-        for component_filename in component_filenames:
+        if variant is not None:
+            filtered_component_filenames = filter_with_regex(component_filenames, variant_file_re)
+        else:
+            filtered_component_filenames = filter_with_regex(component_filenames, non_variant_file_re)
+        for component_filename in filtered_component_filenames:
             filename, extension = os.path.splitext(component_filename)
 
             match_exists = extension == ".safetensors"
@@ -159,6 +192,10 @@ def filter_model_files(filenames):
     return [f for f in filenames if any(f.endswith(extension) for extension in allowed_extensions)]
 
 
+def filter_with_regex(filenames, pattern_re):
+    return {f for f in filenames if pattern_re.match(f.split("/")[-1]) is not None}
+
+
 def variant_compatible_siblings(filenames, variant=None, ignore_patterns=None) -> Union[List[os.PathLike], str]:
     weight_names = [
         WEIGHTS_NAME,
@@ -207,9 +244,6 @@ def filter_for_compatible_extensions(filenames, ignore_patterns=None):
         # interested in the extension name
         return {f for f in filenames if not any(f.endswith(pat.lstrip("*.")) for pat in ignore_patterns)}
 
-    def filter_with_regex(filenames, pattern_re):
-        return {f for f in filenames if pattern_re.match(f.split("/")[-1]) is not None}
-
     # Group files by component
     components = {}
     for filename in filenames:
@@ -997,7 +1031,7 @@ def _get_ignore_patterns(
         use_safetensors
         and not allow_pickle
         and not is_safetensors_compatible(
-            model_filenames, passed_components=passed_components, folder_names=model_folder_names
+            model_filenames, passed_components=passed_components, folder_names=model_folder_names, variant=variant
         )
     ):
         raise EnvironmentError(
@@ -1008,7 +1042,7 @@ def _get_ignore_patterns(
         ignore_patterns = ["*.bin", "*.safetensors", "*.onnx", "*.pb"]
 
     elif use_safetensors and is_safetensors_compatible(
-        model_filenames, passed_components=passed_components, folder_names=model_folder_names
+        model_filenames, passed_components=passed_components, folder_names=model_folder_names, variant=variant
     ):
         ignore_patterns = ["*.bin", "*.msgpack"]
 
diff --git a/tests/pipelines/test_pipeline_utils.py b/tests/pipelines/test_pipeline_utils.py
@@ -87,21 +87,24 @@ def test_all_is_compatible_variant(self):
             "unet/diffusion_pytorch_model.fp16.bin",
             "unet/diffusion_pytorch_model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_model_is_compatible_variant(self):
         filenames = [
             "unet/diffusion_pytorch_model.fp16.bin",
             "unet/diffusion_pytorch_model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_model_is_compatible_variant_mixed(self):
         filenames = [
             "unet/diffusion_pytorch_model.bin",
             "unet/diffusion_pytorch_model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_model_is_not_compatible_variant(self):
         filenames = [
@@ -121,7 +124,8 @@ def test_transformer_model_is_compatible_variant(self):
             "text_encoder/pytorch_model.fp16.bin",
             "text_encoder/model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_transformer_model_is_not_compatible_variant(self):
         filenames = [
@@ -145,7 +149,8 @@ def test_transformer_model_is_compatible_variant_extra_folder(self):
             "unet/diffusion_pytorch_model.fp16.bin",
             "unet/diffusion_pytorch_model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames, folder_names={"vae", "unet"}))
+        self.assertFalse(is_safetensors_compatible(filenames, folder_names={"vae", "unet"}))
+        self.assertTrue(is_safetensors_compatible(filenames, folder_names={"vae", "unet"}, variant="fp16"))
 
     def test_transformer_model_is_not_compatible_variant_extra_folder(self):
         filenames = [
@@ -173,7 +178,8 @@ def test_transformers_is_compatible_variant_sharded(self):
             "text_encoder/model.fp16-00001-of-00002.safetensors",
             "text_encoder/model.fp16-00001-of-00002.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_is_compatible_sharded(self):
         filenames = [
@@ -189,13 +195,15 @@ def test_diffusers_is_compatible_variant_sharded(self):
             "unet/diffusion_pytorch_model.fp16-00001-of-00002.safetensors",
             "unet/diffusion_pytorch_model.fp16-00001-of-00002.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_is_compatible_only_variants(self):
         filenames = [
             "unet/diffusion_pytorch_model.fp16.safetensors",
         ]
-        self.assertTrue(is_safetensors_compatible(filenames))
+        self.assertFalse(is_safetensors_compatible(filenames))
+        self.assertTrue(is_safetensors_compatible(filenames, variant="fp16"))
 
     def test_diffusers_is_compatible_no_components(self):
         filenames = [
diff --git a/tests/pipelines/test_pipelines.py b/tests/pipelines/test_pipelines.py
@@ -538,26 +538,38 @@ def test_download_variant_partly(self):
             variant = "no_ema"
 
             with tempfile.TemporaryDirectory() as tmpdirname:
-                tmpdirname = StableDiffusionPipeline.download(
-                    "hf-internal-testing/stable-diffusion-all-variants",
-                    cache_dir=tmpdirname,
-                    variant=variant,
-                    use_safetensors=use_safetensors,
-                )
-                all_root_files = [t[-1] for t in os.walk(tmpdirname)]
-                files = [item for sublist in all_root_files for item in sublist]
-
-                unet_files = os.listdir(os.path.join(tmpdirname, "unet"))
+                if use_safetensors:
+                    with self.assertRaises(OSError) as error_context:
+                        tmpdirname = StableDiffusionPipeline.download(
+                            "hf-internal-testing/stable-diffusion-all-variants",
+                            cache_dir=tmpdirname,
+                            variant=variant,
+                            use_safetensors=use_safetensors,
+                        )
+                    assert "Could not find the necessary `safetensors` weights" in str(error_context.exception)
+                else:
+                    tmpdirname = StableDiffusionPipeline.download(
+                        "hf-internal-testing/stable-diffusion-all-variants",
+                        cache_dir=tmpdirname,
+                        variant=variant,
+                        use_safetensors=use_safetensors,
+                    )
+                    all_root_files = [t[-1] for t in os.walk(tmpdirname)]
+                    files = [item for sublist in all_root_files for item in sublist]
 
-                # Some of the downloaded files should be a non-variant file, check:
-                # https://huggingface.co/hf-internal-testing/stable-diffusion-all-variants/tree/main/unet
-                assert len(files) == 15, f"We should only download 15 files, not {len(files)}"
-                # only unet has "no_ema" variant
-                assert f"diffusion_pytorch_model.{variant}{this_format}" in unet_files
-                assert len([f for f in files if f.endswith(f"{variant}{this_format}")]) == 1
-                # vae, safety_checker and text_encoder should have no variant
-                assert sum(f.endswith(this_format) and not f.endswith(f"{variant}{this_format}") for f in files) == 3
-                assert not any(f.endswith(other_format) for f in files)
+                    unet_files = os.listdir(os.path.join(tmpdirname, "unet"))
+
+                    # Some of the downloaded files should be a non-variant file, check:
+                    # https://huggingface.co/hf-internal-testing/stable-diffusion-all-variants/tree/main/unet
+                    assert len(files) == 15, f"We should only download 15 files, not {len(files)}"
+                    # only unet has "no_ema" variant
+                    assert f"diffusion_pytorch_model.{variant}{this_format}" in unet_files
+                    assert len([f for f in files if f.endswith(f"{variant}{this_format}")]) == 1
+                    # vae, safety_checker and text_encoder should have no variant
+                    assert (
+                        sum(f.endswith(this_format) and not f.endswith(f"{variant}{this_format}") for f in files) == 3
+                    )
+                    assert not any(f.endswith(other_format) for f in files)
 
     def test_download_variants_with_sharded_checkpoints(self):
         # Here we test for downloading of "variant" files belonging to the `unet` and
@@ -588,20 +600,17 @@ def test_download_legacy_variants_with_sharded_ckpts_raises_warning(self):
         logger = logging.get_logger("diffusers.pipelines.pipeline_utils")
         deprecated_warning_msg = "Warning: The repository contains sharded checkpoints for variant"
 
-        for is_local in [True, False]:
-            with CaptureLogger(logger) as cap_logger:
-                with tempfile.TemporaryDirectory() as tmpdirname:
-                    local_repo_id = repo_id
-                    if is_local:
-                        local_repo_id = snapshot_download(repo_id, cache_dir=tmpdirname)
+        with CaptureLogger(logger) as cap_logger:
+            with tempfile.TemporaryDirectory() as tmpdirname:
+                local_repo_id = snapshot_download(repo_id, cache_dir=tmpdirname)
 
-                    _ = DiffusionPipeline.from_pretrained(
-                        local_repo_id,
-                        safety_checker=None,
-                        variant="fp16",
-                        use_safetensors=True,
-                    )
-            assert deprecated_warning_msg in str(cap_logger), "Deprecation warning not found in logs"
+                _ = DiffusionPipeline.from_pretrained(
+                    local_repo_id,
+                    safety_checker=None,
+                    variant="fp16",
+                    use_safetensors=True,
+                )
+        assert deprecated_warning_msg in str(cap_logger), "Deprecation warning not found in logs"
 
     def test_download_safetensors_only_variant_exists_for_model(self):
         variant = None
@@ -616,7 +625,7 @@ def test_download_safetensors_only_variant_exists_for_model(self):
                     variant=variant,
                     use_safetensors=use_safetensors,
                 )
-            assert "Error no file name" in str(error_context.exception)
+            assert "Could not find the necessary `safetensors` weights" in str(error_context.exception)
 
         # text encoder has fp16 variants so we can load it
         with tempfile.TemporaryDirectory() as tmpdirname:
@@ -675,7 +684,7 @@ def test_download_safetensors_variant_does_not_exist_for_model(self):
                     use_safetensors=use_safetensors,
                 )
 
-            assert "Error no file name" in str(error_context.exception)
+            assert "Could not find the necessary `safetensors` weights" in str(error_context.exception)
 
     def test_download_bin_variant_does_not_exist_for_model(self):
         variant = "no_ema"
