Trying to customize transformer (error)

Hi all,

I am trying to customize the huggingface transformer library.
The step which i followed is :-

git clone \
pip install -e .
But when i trying to import :-
``from transformers import AutoModelForSeq2SeqLM,DataCollatorForSeq2Seq,AutoTokenizer ```

i am getting error as

`` cannot import name 'AutoModelForSeq2SeqLM' from 'transformers' (unknown location)``

I have tried setting the os sys path , but it didn't work. Has anyone done this kind of work before. How do we exactly change the functions of transformer?

Thank you in advance.