Necessity of torchvision dependency

[niazarak]

Hi, thanks for your work, we've been using sbert for quite some time.

We noticed that sentence-transformers depend on torchvision, and while it was necessary for CLIP implementation in previous versions, now sentence-transformers use CLIP from HF (commit).

Is there any reason to keep this dependency now?

[nreimers]

I think the HF clip model also requires torchvision

[iamhatesz]

How about moving torchvision to extras dependencies? I have a completely non-CV setup and this only complicates things for me. See e.g.: pytorch/vision#5393

[ecly]

Agreed with @iamhatesz that having it as optional would be ideal, as torchvision sometimes can be a headache.

[glemaitre]

@tomaarsen I think this issue can be closed after the merge of #1881

[tomaarsen]

I agree, thanks for pointing this out!