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4a06c745 - Min-SNR Gamma: follow-up fix for zero-terminal SNR models on v-prediction or epsilon (#5177)

Min-SNR Gamma: follow-up fix for zero-terminal SNR models on v-prediction or epsilon (#5177) * merge with main * fix flax example * fix onnx example --------- Co-authored-by: bghira <bghira@users.github.com> Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>