[Dynamo] Support several missing torch.* ops

[yanboliang]

🐛 Describe the bug

This is the list of torch.* ops that we are missing support, but was used frequently in 14k github models:

• torch.is_complex
• torch.get_autocast_gpu_dtype
• torch.nn.init._calculate_correct_fan

Versions

N/A

cc @ezyang @msaroufim @wconstab @ngimel @bdhirsh @anijain2305 @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @Xia-Weiwen @wenzhe-nrv @jiayisunx

[yanboliang]

For torch.nn.init._calculate_correct_fan we should add support under TorchVariable.call_function and compute the result during compilation. It's a bit complicated, so we can skip it for the hackday task.

[fduwjj]

Hi, @yanboliang do you mean something like

result = TorchVariable(torch.mul, **options).call_function( tx, [result, kwargs["value"]], {} )?