Avoid duplicate import in IPEX auto importer (#11227)

* Add custom import to avoid ipex duplicate importing
* Add scope limitation

python/llm/src/ipex_llm/utils/ipex_importer.py

@@ -19,6 +19,43 @@ import logging
 import builtins
 import sys
 from ipex_llm.utils.common import log4Error
+import inspect
+
+# Save the original __import__ function
+original_import = builtins.__import__
+ipex_duplicate_import_error = "intel_extension_for_pytorch has already been automatically " + \
+    "imported. Please avoid importing it again!"
+
+
+def get_calling_package():
+    """
+    Return calling package name, e.g., ipex_llm.transformers
+    """
+    # Get the current stack frame
+    frame = inspect.currentframe()
+    # Get the caller's frame
+    caller_frame = frame.f_back.f_back
+    # Get the caller's module
+    module = inspect.getmodule(caller_frame)
+    if module:
+        # Return the module's package name
+        return module.__package__
+    return None
+
+
+def custom_ipex_import(name, globals=None, locals=None, fromlist=(), level=0):
+    """
+    Custom import function to avoid importing ipex again
+    """
+    # check import calling pacage
+    calling_package = get_calling_package()
+    if calling_package is not None:
+        return original_import(name, globals, locals, fromlist, level)
+    # Only check ipex for main thread
+    if name == "ipex" or name == "intel_extension_for_pytorch":
+        log4Error.invalidInputError(False,
+                                    ipex_duplicate_import_error)
+    return original_import(name, globals, locals, fromlist, level)
 
 
 class IPEXImporter:
@@ -61,12 +98,12 @@ class IPEXImporter:
         if self.is_xpu_version_installed():
             # Check if user import ipex manually
             if 'ipex' in sys.modules or 'intel_extension_for_pytorch' in sys.modules:
-                logging.error("ipex_llm will automatically import intel_extension_for_pytorch.")
                 log4Error.invalidInputError(False,
-                                            "Please import ipex_llm before importing \
-                                                intel_extension_for_pytorch!")
+                                            ipex_duplicate_import_error)
             self.directly_import_ipex()
             self.ipex_version = ipex.__version__
+            # Replace default importer
+            builtins.__import__ = custom_ipex_import
             logging.info("intel_extension_for_pytorch auto imported")
 
     def directly_import_ipex(self):
@@ -95,6 +132,8 @@ class IPEXImporter:
         # try to import Intel Extension for PyTorch and get version
         self.directly_import_ipex()
         self.ipex_version = ipex.__version__
+        # Replace default importer
+        builtins.__import__ = custom_ipex_import
         return self.ipex_version