Discrete Fourier Transform#

Standard FFTs#

`mars.tensor.fft.fft`	Compute the one-dimensional discrete Fourier Transform.
`mars.tensor.fft.ifft`	Compute the one-dimensional inverse discrete Fourier Transform.
`mars.tensor.fft.fft2`	Compute the 2-dimensional discrete Fourier Transform
`mars.tensor.fft.ifft2`	Compute the 2-dimensional inverse discrete Fourier Transform.
`mars.tensor.fft.fftn`	Compute the N-dimensional discrete Fourier Transform.
`mars.tensor.fft.ifftn`	Compute the N-dimensional inverse discrete Fourier Transform.

Real FFTs#

`mars.tensor.fft.rfft`	Compute the one-dimensional discrete Fourier Transform for real input.
`mars.tensor.fft.irfft`	Compute the inverse of the n-point DFT for real input.
`mars.tensor.fft.rfft2`	Compute the 2-dimensional FFT of a real tensor.
`mars.tensor.fft.irfft2`	Compute the 2-dimensional inverse FFT of a real array.
`mars.tensor.fft.rfftn`	Compute the N-dimensional discrete Fourier Transform for real input.
`mars.tensor.fft.irfftn`	Compute the inverse of the N-dimensional FFT of real input.

Hermitian FFTs#

`mars.tensor.fft.hfft`	Compute the FFT of a signal that has Hermitian symmetry, i.e., a real spectrum.
`mars.tensor.fft.ihfft`	Compute the inverse FFT of a signal that has Hermitian symmetry.

Helper routines#

`mars.tensor.fft.fftfreq`	Return the Discrete Fourier Transform sample frequencies.
`mars.tensor.fft.rfftfreq`	Return the Discrete Fourier Transform sample frequencies (for usage with rfft, irfft).
`mars.tensor.fft.fftshift`	Shift the zero-frequency component to the center of the spectrum.
`mars.tensor.fft.ifftshift`	The inverse of fftshift.