TE convert model with deferred initialization #3646
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This PR adds a memory efficient way of converting models with Transformer Engine via lazy weight initialization. Transformer Engine added Deferred Initialization here (NVIDIA/TransformerEngine#596). Pulling this into convert_model function. Loading large models directly to memory results in OOMs especially in FSDP trainings workflows. This avoids initialization of models before being passed into an FSDP wrapper.
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