feat(megatron): enable batch-invariant logprob parity - #3848
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Signed-off-by: wdykas <wdykas@nvidia.com>
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Port NVIDIA-NeMo#3848 batch-invariant logprob parity (full-vocab gather, raw gen logprobs, train/gen field match, token multiples) and pin Megatron-Bridge to MLM tip 09a71df43. Keep research launch scripts and debug recipes; leave .env / job logs untracked. Signed-off-by: YigongQin <qqqyyy1233@outlook.com>
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