public class ShuffleFederatedScheme
extends DataPartitionFederatedScheme
Shuffle Federated scheme
 When the parameter server runs in federated mode it cannot pull in the data which is already on the workers.
 Therefore, a UDF is sent to manipulate the data locally. In this case it is shuffled by generating a permutation
 matrix with a global seed and doing a mat mult.
 Then all entries in the federation map of the input matrix are separated into MatrixObjects and returned as a list.
 Only supports row federated matrices atm.