[Refactor] Minor Improvement for import utils (#11161)

* update

* update

* addressed PR comments

* update

---------
Co-authored-by: YiYi Xu <yixu310@gmail.com>

src/diffusers/utils/import_utils.py

@@ -16,13 +16,14 @@ Import utilities: Utilities related to imports and our lazy inits.
 """
 
 import importlib.util
+import inspect
 import operator as op
 import os
 import sys
-from collections import OrderedDict
+from collections import OrderedDict, defaultdict
 from itertools import chain
 from types import ModuleType
-from typing import Any, Union
+from typing import Any, Tuple, Union
 
 from huggingface_hub.utils import is_jinja_available  # noqa: F401
 from packaging.version import Version, parse
@@ -54,12 +55,36 @@ STR_OPERATION_TO_FUNC = {">": op.gt, ">=": op.ge, "==": op.eq, "!=": op.ne, "<="
 _is_google_colab = "google.colab" in sys.modules or any(k.startswith("COLAB_") for k in os.environ)
 
 
-def _is_package_available(pkg_name: str):
+def _is_package_available(pkg_name: str, get_dist_name: bool = False) -> Tuple[bool, str]:
     pkg_exists = importlib.util.find_spec(pkg_name) is not None
     pkg_version = "N/A"
 
     if pkg_exists:
         try:
+            package_map = importlib_metadata.packages_distributions()
+        except Exception as e:
+            package_map = defaultdict(list)
+            if isinstance(e, AttributeError):
+                try:
+                    # Fallback for Python < 3.10
+                    for dist in importlib_metadata.distributions():
+                        _top_level_declared = (dist.read_text("top_level.txt") or "").split()
+                        _infered_opt_names = {
+                            f.parts[0] if len(f.parts) > 1 else inspect.getmodulename(f) for f in (dist.files or [])
+                        } - {None}
+                        _top_level_inferred = filter(lambda name: "." not in name, _infered_opt_names)
+                        for pkg in _top_level_declared or _top_level_inferred:
+                            package_map[pkg].append(dist.metadata["Name"])
+                except Exception as _:
+                    pass
+
+        try:
+            if get_dist_name and pkg_name in package_map and package_map[pkg_name]:
+                if len(package_map[pkg_name]) > 1:
+                    logger.warning(
+                        f"Multiple distributions found for package {pkg_name}. Picked distribution: {package_map[pkg_name][0]}"
+                    )
+                pkg_name = package_map[pkg_name][0]
             pkg_version = importlib_metadata.version(pkg_name)
             logger.debug(f"Successfully imported {pkg_name} version {pkg_version}")
         except (ImportError, importlib_metadata.PackageNotFoundError):
@@ -189,15 +214,7 @@ _xformers_available, _xformers_version = _is_package_available("xformers")
 _gguf_available, _gguf_version = _is_package_available("gguf")
 _torchao_available, _torchao_version = _is_package_available("torchao")
 _bitsandbytes_available, _bitsandbytes_version = _is_package_available("bitsandbytes")
-_torchao_available, _torchao_version = _is_package_available("torchao")
-
-_optimum_quanto_available = importlib.util.find_spec("optimum") is not None
-if _optimum_quanto_available:
-    try:
-        _optimum_quanto_version = importlib_metadata.version("optimum_quanto")
-        logger.debug(f"Successfully import optimum-quanto version {_optimum_quanto_version}")
-    except importlib_metadata.PackageNotFoundError:
-        _optimum_quanto_available = False
+_optimum_quanto_available, _optimum_quanto_version = _is_package_available("optimum", get_dist_name=True)
 
 
 def is_torch_available():