Implementation of cACGMM and related methods

[tky823]

Summary

Implement a complex angular central Gaussian mixture model for blind source separation.

• cACGMM
  • N. Ito, S. Araki, and T. Nakatani. "Complex angular central Gaussian mixture model for directional statistics in mask-based microphone array signal processing," in Proc. EUSIPCO, 2016, pp. 1153-1157.
• cWMM
• TV-cGMM

Requirements

To address this issue, I have to prepare some stuff beforehand.

• permutation solver
• log-sum-exp function
• softmax function