cupynumeric.fft.fft2#

cupynumeric.fft.fft2( a: ndarray, s: Sequence[int] | None = None, axes: Sequence[int] = (-2, -1), norm: str | None = None, ) → ndarray#

Compute the 2-dimensional discrete Fourier Transform.

This function computes the n-dimensional discrete Fourier Transform over any axes in an M-dimensional array by means of the Fast Fourier Transform (FFT). By default, the transform is computed over the last two axes of the input array, i.e., a 2-dimensional FFT.

Parameters:

a (array_like) – Input array, can be complex
s (sequence of ints, optional) – Shape (length of each transformed axis) of the output (s[0] refers to axis 0, s[1] to axis 1, etc.). This corresponds to n for fft(x, n). Along each axis, if the given shape is smaller than that of the input, the input is cropped. If it is larger, the input is padded with zeros. if s is not given, the shape of the input along the axes specified by axes is used.
axes (sequence of ints, optional) – Axes over which to compute the FFT. If not given, the last two axes are used. A repeated index in axes means the transform over that axis is performed multiple times. A one-element sequence means that a one-dimensional FFT is performed.
norm ({"backward", "ortho", "forward"}, optional) – Normalization mode (see numpy.fft). Default is “backward”. Indicates which direction of the forward/backward pair of transforms is scaled and with what normalization factor.

Returns:

out – The truncated or zero-padded input, transformed along the axes indicated by axes, or the last two axes if axes is not given.

Return type:

complex ndarray

Notes

Multi-GPU usage is limited to data parallel axis-wise batching.