implement own metrics or use lighter packages

[Borda]

🚀 Feature

revisit 3rd-party dependencies and if possible make own implementation or use a lighter package

Motivation

keep the TM dependency light, and use other packages only as a reference

Pitch

Alternatives

use another package that has less dependencies and still use this one as reference

Additional context

https://github.com/PyTorchLightning/metrics/blob/525642df8c3f3f5f93cdd22b6b9cd802a3854634/requirements/image.txt#L3

https://github.com/PyTorchLightning/metrics/blob/525642df8c3f3f5f93cdd22b6b9cd802a3854634/requirements/text.txt#L1-L3

Particular tasks:

• implement own BERT score #432

[stancld]

@Borda May I have a look at the rouge_score metric?

[Borda]

@Borda May I have a look at the rouge_score metric?

that would be great! looking forward to see draft PR 🐰

[kingyiusuen]

@Borda I'd love to contribute to this project. Do you mind if I work on the WER metric to remove the dependency of jiwer?

[Borda]

Do you mind if I work on the WER metric to remove the dependency of jiwer?

wow, that you, that would be really great! 🐰
cc: @SeanNaren