Custom affinity_function and post_eigen_cluster_function

v0.2.4

[Issue #25] Add links to Turn-to-Diarize paper

EigenGapType, auto-tune ratio, and Turn-to-Diarize configs

• Allow using different types of eigen gap.
• Adjusting auto-tune ratio.
• Submitting Turn-to-Diarize configs.

Use ThresholdType enum

Also use enum type of ThresholdType instead of the boolean thresholding_with_row_max.

Laplacian, cosine distance, auto-tune, and constrained spectral clustering

v0.2.0 is a complete overhaul of the SpectralCluster library.

List of changes and new features:

• Use 2-space indent Google internal coding style.
• Use options classes instead of long list of arguments.
• Support different types of Laplacian matrices.
• Support different types of distances for K-Means, such as cosine distance.
• Support auto-tune of the p-percentile.
• Implement constrained spectral clustering.
• Use Enum wherever possible.
• Add configs.py as reference to configurations used in our papers.
• Add permutation invariance for tests.