Fix lazy init to stop hiding errors in import (#14124)

src/transformers/file_utils.py

@@ -2146,7 +2146,12 @@ class _LazyModule(ModuleType):
         return value
 
     def _get_module(self, module_name: str):
-        return importlib.import_module("." + module_name, self.__name__)
+        try:
+            return importlib.import_module("." + module_name, self.__name__)
+        except Exception as e:
+            raise RuntimeError(
+                f"Failed to import {self.__name__}.{module_name} because of the following error (look up to see its traceback):\n{e}"
+            ) from e
 
     def __reduce__(self):
         return (self.__class__, (self._name, self.__file__, self._import_structure))