Fix Regularization error

test_param_change.cpp

@@ -0,0 +1,36 @@
+#include <svm_classifier/svm_classifier.hpp>
+#include <torch/torch.h>
+#include <iostream>
+
+using namespace svm_classifier;
+
+int main() {
+    try {
+        std::cout << "Creating linear SVM..." << std::endl;
+        SVMClassifier svm(KernelType::LINEAR, 1.0);
+        
+        std::cout << "Generating data..." << std::endl;
+        torch::manual_seed(42);
+        auto X = torch::randn({50, 3});
+        auto y = torch::randint(0, 2, {50});
+        
+        std::cout << "Training SVM..." << std::endl;
+        auto metrics = svm.fit(X, y);
+        std::cout << "Training completed successfully!" << std::endl;
+        std::cout << "Is fitted: " << svm.is_fitted() << std::endl;
+        
+        std::cout << "\nChanging to RBF kernel..." << std::endl;
+        nlohmann::json new_params = {{"kernel", "rbf"}};
+        svm.set_parameters(new_params);
+        std::cout << "Parameters changed successfully!" << std::endl;
+        std::cout << "Is fitted after param change: " << svm.is_fitted() << std::endl;
+        
+        std::cout << "\nAll operations completed successfully!" << std::endl;
+        
+    } catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+        return 1;
+    }
+    
+    return 0;
+}