def forward(ctx, twiddle, input):
"""Multiply by a single factor.
Parameters:
twiddle: (2, 2, n) if real or (2, 2, n, 2) if complex
input: (batch_size, 2, n) if real or (batch_size, 2, n, 2) if complex
Returns:
output: (batch_size, 2, n) if real or (batch_size, 2, n, 2) if complex
"""
ctx.save_for_backward(twiddle, input)
return butterfly_factor_multiply(twiddle, input)
def forward(ctx, coefficients, input):
ctx.save_for_backward(coefficients, input)
return butterfly_factor_multiply(coefficients, input)