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* feat: add a cli util for fp16 and safetensors format.

* fix: commit_description.

* add: usage example.

* [Commands] Add env command

* Apply suggestions from code review

* Fix flake8 F401 '...' imported but unused

* One more F403

* test LMS with LDM

* test LMS with LDM

* Interchangeable sigma and timestep. Added dummy objects

* Debug

* cuda generator

* Fix derivatives

* Update tests

* Rename Lms->LMS

* karras + VE, not flexible yet

* Fix inputs incompatibility with the original unet

* Roll back sigma scaling

* Apply suggestions from code review

* Old comment

* Fix doc