What I did:
Try to get scores with score function

Actual result:
Get the error: 'RobertaTokenizerFast' object has no attribute 'max_len'

Expected result:
score function work as before and get results

More details:

• bert_score version: 0.3.6
• transformers version: 4.0.0
• Python version: 3.8

Context:

• Release notes for the new transformers version: https://github.com/huggingface/transformers/releases/tag/v4.0.0
• PR with removing max_len attribute from transformers package: Remove deprecated huggingface/transformers#8604

Previous warning:
The max_len attribute has been deprecated and will be removed in a future version, use model_max_length instead.