'How pytorch implement forward for a quantized linear layer?

I have a quantized model in pytorch and now I want to extract the parameter of the quantized linear layer and implement the forward manually. I search the source code but only find this function.

def forward(self, x: torch.Tensor) -> torch.Tensor:
    return torch.ops.quantized.linear(
    x, self._packed_params._packed_params, self.scale, self.zero_point)

But no where I can find how torch.ops.quantized.linear is defined.

Can someone give me a hind how the forward of quantized linear are defined?

pytorch quantization

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'How pytorch implement forward for a quantized linear layer?

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