Support to Pytorch 1.9

[Jingnan-Jia]

Just a reminder:

Some APIs need to be updated to support Pytorch 1.9. For instance: torch.testing.assert_allclose should be replaced by torch.testing.assert_close.

And pytorch 1.9 has already Added Numpy seeding to worker of DataLoader ...... users now won’t be required to set random seed for NumPy using worker_init_fn to force NumPy random operations deterministic and independent across DataLoader workers.. So the monai.data.dataloader seems not necessary anymore?

[Nic-Ma]

Hi @Jingnan-Jia ,

Thanks for your interest here.

1. Currently, we are trying to support PyTorch 1.5 - 1.9, so we should make MONAI APIs compatible with these versions.
2. monai.data.DataLoader also uses our enhanced collate_fn.

Thanks.