* Fix ipex auto importer with Python builtins.
* Raise errors if the user imports ipex manually before importing ipex_llm. Do nothing if they import ipex after importing ipex_llm.
* Remove import ipex in examples.
* Add mamba cpu example
* Add mamba gpu example
* Use a smaller model as the example
* minor fixes
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Co-authored-by: Shengsheng Huang <shengsheng.huang@intel.com>