asfiyab-nvidia

Results 2 issues of asfiyab-nvidia

### Enable dynamo onnx export of BasicUNet models TorchDynamo based ONNX export does not support `torch.jit.isinstance()`. To enable the export via dynamo, I've updated the calls to `torch.jit.isinstance` to `isinstance`....

## 🐛 Bug I want to test Thunder on the Stable Diffusion XL model. However, the CLIP and UNET models are both running into support issues. ### To Reproduce ####...

bug