dask-image / dask-ndfourier / 88

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Pull #34

travis-ci

<a href="https://github.com/dask-image/dask-ndfourier/commit/38d352f2e">Pull in our fftfreq simplifications from upstream

Backports some changes we made to Dask&#39;s `fftfreq` into our `_compat`
version of `fftfreq` to generally clean up the `fftfreq` implementation.
Not only does it simplify the implementation, it seems to speed it up in
some cases.

Switched to using `map_blocks` and a custom Python function, which is
applied over `arange` to implement `_fftfreq` internally. This makes the
overall implementation cleaner and simpler. Also avoids needing various
chunking related tricks. Plus it appears this goes a bit faster than the
old implementation. How much faster seems to depend on the size of the
frequency range and the size of the chunks.

ref: https://github.com/dask/dask/commit/</a><a class="double-link" href="https://github.com/dask-image/dask-ndfourier/commit/2b2d9f9dd">2b2d9f9dd</a>

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