Merge pull request kohya-ss#1879 from kohya-ss/dev

merge dev to main

add about dev and sd3 branch to README

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