support dynamic quantization of pytorch

[zaobao]

Description

dynamic quantization (weights quantized with activations read/stored in floating point and quantized for compute)

Will this change the current api?

• Model.quantize

Who will benefit from this enhancement?
Today, PyTorch supports the following backends for running quantized operators efficiently:

• x86 CPUs with AVX2 support or higher (without AVX2 some operations have inefficient implementations), via x86 optimized by fbgemm and onednn (see the details at RFC)

• ARM CPUs (typically found in mobile/embedded devices), via qnnpack

• (early prototype) support for NVidia GPU via TensorRT through fx2trt (to be open sourced)

References

• pytorch dynamic quantization
• pytorch quantization
• sentence-transformers quantization