def forward(ctx, x, b_out=None): # pylint: disable=W
from s2cnn.utils.complex import as_complex
ctx.b_out = b_out
ctx.b_in = x.size(-1) // 2
return s2_fft(as_complex(x), b_out=ctx.b_out)
def backward(ctx, grad_output): # pylint: disable=W
from s2cnn.utils.complex import as_complex
return s2_fft(as_complex(grad_output), for_grad=True,
b_out=ctx.b_in), None
def forward(self, x): # pylint: disable=W
from s2cnn.utils.complex import as_complex
self.b_in = x.size(-1) // 2
return s2_fft(as_complex(x), b_out=self.b_out)
