We can't initialize a matrix with an uninitialized matrix.

src/mlpack/methods/ann/optimizer/rmsprop.hpp

@@ -54,8 +54,7 @@ class RMSPROP
       function(function),
       lr(lr),
       alpha(alpha),
-      eps(eps),
-      meanSquaredGad(function.Weights())
+      eps(eps)
   {
     // Nothing to do here.
   }

src/mlpack/methods/ann/optimizer/steepest_descent.hpp

@@ -38,8 +38,7 @@ class SteepestDescent
                   const double mom = 0) :
       function(function),
       lr(lr),
-      mom(mom),
-      momWeights(function.Weights())
+      mom(mom)
 
   {
     // Nothing to do here.