Add AWQ 4bit inference support #2103
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Why are these changes needed?
In this PR we introduce AWQ 4bit inference to FastChat. AWQ supports efficient and accurate low-bit weight quantization for LLMs, and helps to run larger language models within the device memory restriction and prominently accelerates token generation. For example, when running LLaMA-2-7b, AWQ delivers 2.3x and 1.4x speedups over the FP16 baseline on RTX 4090 and Jetson Orin, respectively.
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