Utils example computes number of labels.
Utils example computes number of labels.

Fixes #13 continuation.

crowd-ai/post-processing-experiments,lucasb-eyer/pydensecrf,lucasb-eyer/pydensecrf,lucasb-eyer/pydensecrf,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments