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* Add finetuning Colossal-Llama-2 example

* Add finetuning Colossal-Llama-2 example 2

* Add finetuning Colossal-Llama-2 example and support NEFTuning

* Add inference example and refine neftune

* Modify readme file

* update the imports

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Co-authored-by: Xu Yuanchen <yuanchen.xu00@gmail.com>
Co-authored-by: Camille Zhong <44392324+Camille7777@users.noreply.github.com>

Co-authored-by: github-actions <github-actions@github.com>

To be compatible with the new change in the Transformers library, where a new argument 'padding_mask' was added to forward function of attention layer.
https://github.com/huggingface/transformers/pull/25598