RBM and AutoEncoder key fixes:
      Ensured visual bias updated and applied during pretraining.
      RBM HiddenUnit is the activation function for this layer; thus, established derivative calculations for backprop according to respective HiddenUnit.
    RNG performance issues fixed for CUDA backend
    OpenBLAS issues fixed for macOS, powerpc, linux.
    DataVec is back to Java 7 now.
    Multiple minor bugs fixed for ND4J/DL4J
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