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In the picture below, with three segments this means there are two hops that each model state makes to visit all of the data.  If the database cluster had 20 segments, there would be 19 hops in an iteration.

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In this context, the Keras fit parameter epochs means the number of passes over the data in each Greenplum segment within each iteration, i.e., it is actually a sub-epoch in the picture above.  The number_of_iterations parameter in the MADlib fit function is the outer loop controlling the total number of iterations to run.  That is:

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