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cf5265ad - Allow selecting precision to make Dreambooth class images (#1832)

Allow selecting precision to make Dreambooth class images (#1832) * allow selecting precision to make DB class images addresses #1831 * add prior_generation_precision argument * correct prior_generation_precision's description Co-authored-by: Suraj Patil <surajp815@gmail.com> Co-authored-by: Suraj Patil <surajp815@gmail.com>