IPEX Duplicate importer V2 (#11310)

* Add gguf support.
* Avoid error when import ipex-llm for multiple times.
* Add check to avoid duplicate replace and revert.
* Add calling from check to avoid raising exceptions in the submodule.
* Add BIGDL_CHECK_DUPLICATE_IMPORT for controlling duplicate checker. Default is true.

python/llm/src/ipex_llm/__init__.py

@@ -26,13 +26,15 @@ from .llm_patching import llm_patch, llm_unpatch
 import sys
 import types
 
-# Default is false, set to true to auto importing Intel Extension for PyTorch.
+# Default is True, set to False to disable auto importing Intel Extension for PyTorch.
 USE_NPU = os.getenv("BIGDL_USE_NPU", 'False').lower() in ('true', '1', 't')
 BIGDL_IMPORT_IPEX = os.getenv("BIGDL_IMPORT_IPEX", 'True').lower() in ('true', '1', 't')
 BIGDL_IMPORT_IPEX = not USE_NPU and BIGDL_IMPORT_IPEX
 if BIGDL_IMPORT_IPEX:
     # Import Intel Extension for PyTorch as ipex if XPU version is installed
     from .utils.ipex_importer import ipex_importer
+    # Avoid duplicate import
+    if ipex_importer.get_ipex_version() is None:
         ipex_importer.import_ipex()
 
 # Default is true, set to true to auto patching bigdl-llm to ipex_llm.

python/llm/src/ipex_llm/transformers/convert.py

@@ -773,6 +773,9 @@ def ggml_convert_low_bit(model, qtype, optimize_model=True,
                     f"{list(gguf_mixed_qtype.keys())[index]} "
                     f"format......")
     modules_to_not_convert = [] if modules_to_not_convert is None else modules_to_not_convert
+    # Disable ipex duplicate import checker
+    from ipex_llm.utils.ipex_importer import revert_import
+    revert_import()
 
     # using ipex_llm optimizer before changing to bigdl linear
     _enable_ipex = get_enable_ipex()

python/llm/src/ipex_llm/transformers/gguf/api.py

@@ -30,6 +30,9 @@ qtype_map = {
 
 def load_gguf_model(fpath: str, dtype: torch.dtype = torch.float, low_bit: str = "sym_int4"):
     from .gguf import GGUFFileLoader
+    # Disable ipex duplicate import checker
+    from ipex_llm.utils.ipex_importer import revert_import
+    revert_import()
 
     loader = GGUFFileLoader(fpath)
     model_family = loader.config["general.architecture"]

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

@@ -18,15 +18,73 @@ from importlib.metadata import distribution, PackageNotFoundError
 import logging
 import builtins
 import sys
-from ipex_llm.utils.common import log4Error
+import os
 import inspect
+from ipex_llm.utils.common import log4Error
 
-# Save the original __import__ function
-original_import = builtins.__import__
+
+# Default is True, set to False to disable IPEX duplicate checker
+BIGDL_CHECK_DUPLICATE_IMPORT = os.getenv("BIGDL_CHECK_DUPLICATE_IMPORT",
+                                         'True').lower() in ('true', '1', 't')
+RAW_IMPORT = None
+IS_IMPORT_REPLACED = False
 ipex_duplicate_import_error = "intel_extension_for_pytorch has already been automatically " + \
     "imported. Please avoid importing it again!"
 
 
+def replace_import():
+    global RAW_IMPORT, IS_IMPORT_REPLACED
+    # Avoid multiple replacement
+    if not IS_IMPORT_REPLACED and RAW_IMPORT is None:
+        # Save the original __import__ function
+        RAW_IMPORT = builtins.__import__
+        builtins.__import__ = custom_ipex_import
+        IS_IMPORT_REPLACED = True
+
+
+def revert_import():
+    if not BIGDL_CHECK_DUPLICATE_IMPORT:
+        return
+    global RAW_IMPORT, IS_IMPORT_REPLACED
+    # Only revert once
+    if RAW_IMPORT is not None and IS_IMPORT_REPLACED:
+        builtins.__import__ = RAW_IMPORT
+        IS_IMPORT_REPLACED = False
+
+
+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
+    """
+    if fromlist is not None or '.' in name:
+        return RAW_IMPORT(name, globals, locals, fromlist, level)
+    # Avoid errors in submodule import
+    calling = get_calling_package()
+    if calling is not None:
+        return RAW_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 RAW_IMPORT(name, globals, locals, fromlist, level)
+
+
 class IPEXImporter:
     """
     Auto import Intel Extension for PyTorch as ipex,
@@ -71,6 +129,9 @@ class IPEXImporter:
                                             ipex_duplicate_import_error)
             self.directly_import_ipex()
             self.ipex_version = ipex.__version__
+            # Replace builtin import to avoid duplicate ipex import
+            if BIGDL_CHECK_DUPLICATE_IMPORT:
+                replace_import()
             logging.info("intel_extension_for_pytorch auto imported")
 
     def directly_import_ipex(self):