HFM may not be available due to compatibility issues

[LiangcaiSu]

HFM adopts HolographicInteractionLayer in fuxictr/pytorch/layers/interaction.py.

However, HolographicInteractionLayer may be not available in Pytorch 1.10 because torch.rfft/torch.irfft has changed.\

Here is a solution for reference:

try:
    from torch import irfft
    from torch import rfft
except ImportError:
    from torch.fft import irfft2
    from torch.fft import rfft2
    def rfft(x, d):
        t = rfft2(x, dim = (-d))
        return torch.stack((t.real, t.imag), -1)
    def irfft(x, d, signal_sizes):
        return irfft2(torch.complex(x[:,:,0], x[:,:,1]), s = signal_sizes, dim = (-d))

[zhujiem]

The issue has been fixed in FuxiCTR v2, which supports pytorch 1.10.