Fixed bug when Dataset is passed empty image set.
Added descriptor with float values normalized to range [0,1]
Rewrote evaluation, added pascal, other measures much faster.
Added class specific distance
Added method to get indexes of patches containing given class.
Fixed bug with dtype in joint_histogram
SGD version of metric alignment with some hacky stuff up front.
New methods needed for class specific training.
Added flags for weighting options.
Class and inv freq distances.
All the new hacky files for the last experiments.