[pyclustering.utils.metric][ccore.utils.metric] V-Measure

[annoviko]

Introduction There is a discussion regarding to purity estimation - see #620 . In order to cover this proposal, V-Measure should be implemented.

References Article: V-Measure: A conditional entropy-based external cluster evaluation measure. Andrew Rosenberg and Julia Hirschberg.

Description The functionality should be implemented for Python and C++ version. The following namespaces are proposed:

• pyclustering.utils.metric (Python).
• pyclustering::utils::metric (C++).

The implementation should be done in line with the description.

Sub-tasks

• [ ] Implement V-Measure for Python version of the library.
• [ ] Implement V-Measure for C++ version of the library.
• [ ] Implement integration of the C++ into Python.
• [ ] Write documentation for Python version including examples.
• [ ] Write documentation for C++ version including examples.