add convert hf to int4 without calibration dataset #1489
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Suppose we have completed Int4 RL training. We will first save a torch_dist checkpoint in BF16 format, and then convert this torch_dist checkpoint into the Hugging Face format. To obtain a true INT4 checkpoint, we further need to convert the BF16 Hugging Face checkpoint into INT4 without using any calibration data.
The purpose of this script is to perform a weight conversion that is functionally equivalent to the INT4(W4A16) QAT.