[core] gracefully error out when attn-backend x cp combo isn't supported. (#12832)
* gracefully error out when attn-backend x cp combo isn't supported.
* Revert "gracefully error out when attn-backend x cp combo isn't supported."
This reverts commit c8abb5d7c01ca6a7c0bf82c27c91a326155a5e43.
* gracefully error out when attn-backend x cp combo isn't supported.
* up
* address PR feedback.
* up
* Update src/diffusers/models/modeling_utils.py
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>
* dot.
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Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>