In the last post regarding the Long Audio Training it was
indicated that there were still some problems in the reduced Baum-Welch implementation. Fortunately these were identified as memory leaks introduced during the optimization and were fixed. In the past days I have made some extensive tests, which show, that modified algorithms perform significantly better than the original version of SphinxTrain with the respect to the memory consumption.
See https://cmusphinx.github.io/wiki/longaudiotraining for more detailed evaluation.