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c1010662 - Correct SNR weighted loss in v-prediction case by only adding 1 to SNR on the denominator (#6307)

Correct SNR weighted loss in v-prediction case by only adding 1 to SNR on the denominator (#6307) * fix minsnr implementation for v-prediction case * format code * always compute snr when snr_gamma is specified --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>