```coca_base``` configuration does not have any ```pretrained``` arguments

[Shyam Marjit]

While trying zero-shot evaluation, the coca_base configuration with pretrained='' gives very less accuracy. Please verify the coca_base configuration.

[Ross Wightman]

There are two pretrained tags for CoCa B/32, if you're using an empty string '' it's not loading a pretrained checkpoint so it's random init.

laion2b_s13b_b90k=_pcfg(hf_hub='laion/CoCa-ViT-B-32-laion2B-s13B-b90k/'),
mscoco_finetuned_laion2b_s13b_b90k=_pcfg(hf_hub='laion/mscoco_finetuned_CoCa-ViT-B-32-laion2B-s13B-b90k/'