Where can I find the code of "ops.quantized.Conv1d"?

The torch quantized conv1d code can be seen in the following link: torch.ao.nn.quantized.modules.conv — PyTorch 2.1 documentation

However, it is difficult to find the code of “ops.quantized.conv1d”
: return ops.quantized.conv1d(input, self._packed_params, self.scale, self.zero_point)

When I see the code, the ops.quantized.conv1d is implemented in the form of “C code”.
Where is the location of code of “ops.quantized.conv1d”?