Acronym list:
GMM	Gaussian mixture model
EM	expectation maximization
E-step	expectation step
M-step	maximization step
MFA	mixture of factor analyzers
MtFA	mixture of Student’s t-factor analyzers
D-MFA	distributed density estimation algorithm for the MFA
D-MtFA	distributed density estimation algorithm for the MtFA
CSS	combined sufficient statistics
LSS	local sufficient statistics
S-MFA	standard EM algorithm for the MFA
S-MtFA	standard EM algorithm for the MtFA
NC-MFA	non-cooperation MFA
NC-MtFA	non-cooperation MtFA
D-GMM	distributed density estimation algorithm for the GMM
D-tMM	distributed density estimation algorithm for the Student’st-mixture model