epfl-lts2 / pygsp / 739 / 3

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travis-ci

nngraph: fix symmetrization

Symmetrizing with the average was setting the distance between v1 and v2
as the average between 0 and the true distance if v1 was the k-NN of v2
but v2 was not in the k-NN of v1.

Moreover, symmetrizing before taking the mean assures that every
distance is counted twice (only some would be counted twice otherwise).

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