You should check which solver is used.
There was some odd regression in the time the example takes.

On 11/26/2015 03:29 AM, Nelson Liu wrote:
Hi everyone,
I was modifying the plot_lena_segmentation.py (http://scikit-learn.org/stable/auto_examples/cluster/plot_lena_segmentation.html) example to use scipy.misc.face(), and the runtime is prohibitively slow. I tried to run it with the face image downsampled 8x, but that unto itself took 2 hours and the final result was unusable due to the downsampling. Does anyone have any suggestions on how to speed up spectral / kmeans clustering?

Thanks
Nelson Liu


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