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FP16 and INT8 inference speed #91

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@dadaligoudan

Hi, thanks for your excellent work, it really helps me in my work. But i have a question here. I modified your code to infer my model. I used FP16 and INT8 precision, both modes have correct inference results. But the FP16 mode and INT8 mode has almost the same inference speed. I wonder why the INT8 mode does not infer faster than FP16 mode? Any sugessions, much thanks.
ps: I used realesrgan-x4v3 model, and i transfer it to onnx format.
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