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Gradient Accumulation #24
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Adds Gradient accumulation to enable arbitrary batch size.
Note that the configs do not change when using accumulation. This is because accumulation over multiple steps (or gpus in future?) will be identical to no accumulation with larger batch size per step. E.g. accumulation=2, batch/step = 32 is identical to no accumulation at batch=64.
This is blocked by PRs: