CV-EM and Ag-EM are model estimation algorithms that have higher generalization ability than EM.
They can estimate precise models from a limited amount of training data. The details of the algorithms are found here.

A simple sample program that trains and evaluates GMM using EM, CV-EM, and Ag-EM.
The source code can be browsed from here.

A pache file to the HTK toolkit and some scripts to train HMM using CV/Ag-EM. cvagemtools.tgz

Please let me know if you have a question.
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