Update partitioner_lib.py

Author: metascroy

extension/llm/export/partitioner_lib.py

@@ -158,7 +158,11 @@ def _validate_ios_version() -> None:
         op_linear_quantizer_config=op_linear_quantizer_config,
     )
 
-    take_over_mutable_buffer = minimum_deployment_target >= ct.target.iOS18
+    # ExecuTorch does not build CoreML delegate runtime to handle state
+    # when using OSS scripts, so we define take_over_mutable_buffer = False,
+    # even when target is iOS18
+    # take_over_mutable_buffer = minimum_deployment_target >= ct.target.iOS18
+    take_over_mutable_buffer = False
     return CoreMLPartitioner(  # pyre-fixme[16]
         compile_specs=compile_specs,
         take_over_mutable_buffer=take_over_mutable_buffer,