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b4077af2 - [bug fix] using snr gamma and prior preservation loss in the dreambooth lora sdxl training scripts (#6356)

[bug fix] using snr gamma and prior preservation loss in the dreambooth lora sdxl training scripts (#6356) * change timesteps used to calculate snr when --with_prior_preservation is enabled * change timesteps used to calculate snr when --with_prior_preservation is enabled (canonical script) * style * revert canonical script to before snr gamma change --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>