missing mri demo data on dropbox

[JeffFessler]

The file https://www.dropbox.com/s/q1cr3u1yyvzjtoj/b0.h5?dl=1 used in the demo https://github.com/guanhuaw/MIRTorch/blob/master/examples/demo_mri.ipynb
is not accessible.

[guanhuaw]

Please following the script here:

if not os.path.exists('./b0.h5'):
    import gdown # ! pip install gdown
    # The specific ID from your link
    file_id = "1Hi998FgWWYKq3rzvczfyb6NYnQbz2Dw8"
    # gdown handles the "virus scan warning" logic automatically
    gdown.download(id=file_id, output='./b0.h5', quiet=False)hf = h5py.File('./b0.h5', 'r')

Still fixing some versioning errors and will carry this into the next PR