[SSD offloading] move sharding/planner and model input generation into config #3448
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…torch#3448) Summary: Pull Request resolved: meta-pytorch#3448 # context * make the planner configurable via config * make the model input configurable via config * SSD offloading enabled {F1982627020} > NOTE: currently there's no pipeline optimization for SSD prefetch, so the SSD lookup is expeced to be very long. [trace](https://drive.google.com/file/d/1CshrtpIip_yd_gYbso_ddFOVVw42V8JR/view?usp=sharing) Differential Revision: D84298150
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…torch#3448) Summary: Pull Request resolved: meta-pytorch#3448 # context * make the planner configurable via config * make the model input configurable via config * SSD offloading enabled {F1982627020} > NOTE: currently there's no pipeline optimization for SSD prefetch, so the SSD lookup is expeced to be very long. [trace](https://drive.google.com/file/d/1CshrtpIip_yd_gYbso_ddFOVVw42V8JR/view?usp=sharing) Differential Revision: D84298150
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