[Half precision] Make sure half-precision is correct (#182)
* [Half precision] Make sure half-precision is correct
* Update src/diffusers/models/unet_2d.py
* Update src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py
* correct some tests
* Apply suggestions from code review
Co-authored-by: Suraj Patil <surajp815@gmail.com>
* finalize
* finish
Co-authored-by: Suraj Patil <surajp815@gmail.com>
