[examples] add check_min_version (#1550)

* add check_min_version for examples

* move __version__ to the top

* Apply suggestions from code review
Co-authored-by: Pedro Cuenca <pedro@huggingface.co>

* fix comment

* fix error_message

* adapt the install message
Co-authored-by: Pedro Cuenca <pedro@huggingface.co>

src/diffusers/utils/__init__.py

@@ -15,6 +15,9 @@
 
 import os
 
+from packaging import version
+
+from .. import __version__
 from .deprecation_utils import deprecate
 from .import_utils import (
     ENV_VARS_TRUE_AND_AUTO_VALUES,
@@ -88,3 +91,16 @@ _COMPATIBLE_STABLE_DIFFUSION_SCHEDULERS = [
     "EulerAncestralDiscreteScheduler",
     "DPMSolverMultistepScheduler",
 ]
+
+
+def check_min_version(min_version):
+    if version.parse(__version__) < version.parse(min_version):
+        if "dev" in min_version:
+            error_message = (
+                "This example requires a source install from HuggingFace diffusers (see "
+                "`https://huggingface.co/docs/diffusers/installation#install-from-source`),"
+            )
+        else:
+            error_message = f"This example requires a minimum version of {min_version},"
+        error_message += f" but the version found is {__version__}.\n"
+        raise ImportError(error_message)