Update megatron-lm reference to run on hopper gpus #748
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Upgrade Dockerfile to use newer pytorch container to ensure that the reference runs on NVIDIA Hopper GPUs
Verified that the new changes do not impact convergence -
GBS = 2048
Original megatron-lm RCP samples from v4.0 RCPs = [1207959552, 1207959552, 1157627904]
One seed convergence samples = [1157627904]
GBS = 3072
Original megatron-lm RCP samples from v4.0 RCPs = [1207959552, 1207959552, 1207959552]
One seed convergence samples = [13790871552]