* Add LangChain upstream ut test for ipynb
* Integrate unit test for LangChain upstream ut and ipynb into one file
* Modify file name
* Remove LangChain version update in unit test
* Move Langchain upstream ut job to arc
* Modify path in .yml file
* Modify path in llm_unit_tests.yml
* Avoid create directory repeatedly
* first draft
* fix
* add readme for transformer_int4_gpu
* fix doc
* check device_map
* add arc ut test
* fix ut test
* fix langchain ut
* Refine README
* fix gpu mem too high
* fix ut test
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Co-authored-by: Ariadne <wyn2000330@126.com>