change huber_schedule from `exponential` to `snr`

Merge pull request kohya-ss#1212 from kohya-ss/dev

Version 0.8.6

Merge pull request kohya-ss#1187 from kohya-ss/fix-timeemb

fix sdxl timestep embedding

Merge pull request kohya-ss#1136 from kohya-ss/dev

v0.8.4

Merge pull request kohya-ss#1085 from kohya-ss/dev

Dev

Merge pull request kohya-ss#1067 from kohya-ss/dev

Dev

Merge pull request kohya-ss#1056 from kohya-ss/dev

fix vram usage in LoRA training

Merge pull request kohya-ss#1052 from kohya-ss/dev

merge dev

Merge pull request kohya-ss#1032 from hopl1t/wandb_session_name_support

Added cli argument for wandb session name

Merge pull request kohya-ss#872 from kohya-ss/dev

fix make_captions_by_git, improve image generation scripts