add back self.max_position_embeddings = config.max_position_embeddings
Author: chengchengpei
Pull request: yes

# What does this PR do?

Fix https://github.com/hiyouga/LLaMA-Factory/issues/5461

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Comments:
@zucchini-nlp ^^ can you take a look at this change? Thanks ^^

@chengchengpei I am not sure why the error is being raised, as the new RoPE doesn't need any position embeddings in its init. Am I missing smth?

> @chengchengpei I am not sure why the error is being raised, as the new RoPE doesn't need any position embeddings in its init. Am I missing smth?

@zucchini-nlp thanks for your reply :)

I am new to transformers. 

i used llama-factory to fine tune. last week, it works. but yesterday, i saw some errors described in https://github.com/hiyouga/LLaMA-Factory/issues/5461

i tracked the code changes and found `self.max_position_embeddings = config.max_position_embeddings` was removed  currently. i can run the finetune again after i added it back. 
if `self.max_position_embeddings = config.max_position_embeddings` is not required, how to fix the errors i saw in https://github.com/hiyouga/LLaMA-Factory/issues/5461 ? thanks for your help.


The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33550). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

@zucchini-nlp 

thanks.

when this PR can be merged?

Yes, sorry. I was off for a while, merging :)