fuse_fx
class torch.quantization.quantize_fx.fuse_fx(model, fuse_custom_config=None, backend_config=None)
Fuse modules like conv+bn, conv+bn+relu etc, model must be in eval
   mode. Fusion rules are defined in
   torch.quantization.fx.fusion_pattern.py
Parameters:
      * model (***) -- a torch.nn.Module model
  * **fuse_custom_config** (***) -- custom configurations for
    fuse_fx. See "FuseCustomConfig" for more details

Return type:
      GraphModule
Example:
  from torch.ao.quantization import fuse_fx
  m = Model().eval()
  m = fuse_fx(m)
