Add mfeat-factors kdb2 & kdb3 networks

Tested with bayesclass & pgmpy kbd2

sample/main.cc

@@ -225,7 +225,7 @@ int main(int argc, char** argv)
     network.fit(Xd, y, features, className);
     cout << "Hello, Bayesian Networks!" << endl;
     showNodesInfo(network, className);
-    showCPDS(network);
+    //showCPDS(network);
     cout << "Score: " << network.score(Xd, y) << endl;
     cout << "PyTorch version: " << TORCH_VERSION << endl;
     return 0;