Initialize and use cuBLAS properly

include/layers/dense.h

@@ -15,7 +15,8 @@ namespace Layers {
         ~Dense();
 
         void forward(const float* input, float* output);
-        void to_cuda();
+        virtual void setWeights(const std::vector<std::vector<float>>& weights) = 0;
+        virtual void setBiases(const std::vector<float>& biases) = 0;
 
     private:
         int inputSize;
@@ -31,6 +32,7 @@ namespace Layers {
 
         void initializeWeights();
         void initializeBiases();
+        void toCuda();
     };
 
 } // namespace Layers