Update bpe.py

[ydasgupt-123]

Requesting an update from the repository: Adding Rotational Positional Encoders to improve the way the model will be able to respond to positions of words not just the embedding from the dict.

[letmestudy]

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[ydasgupt-123]

Adding a positional embedding class for taking the position of the word embeddings into consideration, not just the token_ids

[CYzhr]

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[letmestudy]

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