NMI Constraints Considered

• NMI constraints considered: explicit exceptions are throw when NMI is not applicable instead of outputting 0 or 1. For example, NMI is formally equal to zero when one clustering contains a single cluster of all nodes and another clustering can be any, which says nothing about the clusterings similarity
• Some accuracy and performance optimizations made to avoid evaluation complexity dependence from the overlaps size
• Code refined

The executable is built on Ubuntu x64 16.04