Bit-Level Determinism
An engineering property in large-scale model training that requires training step results to be exactly identical at the bit level given the same inputs, hardware, and software configurations. This is distinct from reproducibility in the statistical sense.
Timeline (last 90 days)
NVIDIA introduced bitwise determinism training capability through Megatron Core.
Bitwise determinism means that under the same input, hardware, and software configuration, the numerical results produced at every step of the training process are completely identical down to the bit level.
General reproducibility only guarantees statistically similar results, whereas bitwise determinism requires bit-for-bit equality.
Determinism guarantees that the training trajectory after resuming from a checkpoint is completely identical to what it would have been without interruption.
Achieving bit-level determinism requires the framework to strictly fix the execution order of aggregation operations, at the cost of sacrificing some overlap optimization space between communication and computation.
All Facts (5)
Bitwise determinism means that under the same input, hardware, and software configuration, the numerical results produced at every step of the training process are completely identical down to the bit level.
50%UnverifiedGeneral reproducibility only guarantees statistically similar results, whereas bitwise determinism requires bit-for-bit equality.
50%UnverifiedDeterminism guarantees that the training trajectory after resuming from a checkpoint is completely identical to what it would have been without interruption.
50%UnverifiedAchieving bit-level determinism requires the framework to strictly fix the execution order of aggregation operations, at the cost of sacrificing some overlap optimization space between communication and computation.
50%UnverifiedNVIDIA introduced bitwise determinism training capability through Megatron Core.
50%