Cluster images by fc10 output - display images closest to cluster center

[etrain]

Cluster images by fc10 output - display images closest to cluster center.

[etrain]

ModelStats now has a top_k_images_by_cluster property - a matrix whose entries A[i,j] correspond to the image id of the j'th ranked image in cluster i, according to (euclidean) distance to cluster center. We are clustering FC10 outputs of all the images.

[etrain]

Done (thanks josh!) - not currently very useful. Planning to see if we can get better clusterings if time. If not - worth showing in the paper anyway.

[etrain]

actually, reopening as bug

[etrain]

We are now clustering by "probs" - once #17 is fixed, this will hopefully look better.

I have also added a property called "cluster_centers" to model stats that contains the centroids for the clusters. This could be useful for display somehow.

[JoshRosen]

Even after fixing #19, the final clusterings still don't seem very intuitive:

I might try using cosine similarity instead of Euclidean distance to see if that gives us more interesting results.