Commit cb460e47 authored by RJ Ryan's avatar RJ Ryan Committed by TensorFlower Gardener
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Add tf.spectral.dct, based on scipy.fftpack.dct. 

Only supports the type II DCT for the moment, but implements SciPy's API to fully match it once type I and III are implemented.

Implemented using a length 2N RFFT, as described here:
https://dsp.stackexchange.com/a/10606

PiperOrigin-RevId: 170808354
parent b3d6b40f
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