Refactor library structure and add sample

src/classifiers/KDB.h

@@ -0,0 +1,21 @@
+#ifndef KDB_H
+#define KDB_H
+#include <torch/torch.h>
+#include "Classifier.h"
+#include "bayesnetUtils.h"
+namespace bayesnet {
+    class KDB : public Classifier {
+    private:
+        int k;
+        float theta;
+        void add_m_edges(int idx, std::vector<int>& S, torch::Tensor& weights);
+    protected:
+        void buildModel(const torch::Tensor& weights) override;
+    public:
+        explicit KDB(int k, float theta = 0.03);
+        virtual ~KDB() = default;
+        void setHyperparameters(const nlohmann::json& hyperparameters) override;
+        std::vector<std::string> graph(const std::string& name = "KDB") const override;
+    };
+}
+#endif