integrating new CNN model

NN/models/enhanced_cnn.py

@@ -371,6 +371,10 @@ class EnhancedCNN(nn.Module):
             nn.Linear(128, 4)  # Low risk, medium risk, high risk, extreme risk
         )
     
+    def _memory_barrier(self, tensor: torch.Tensor) -> torch.Tensor:
+        """Create a memory barrier to prevent in-place operation issues"""
+        return tensor.detach().clone().requires_grad_(tensor.requires_grad)
+    
     def _check_rebuild_network(self, features):
         """Check if network needs to be rebuilt for different feature dimensions"""
         # Prevent rebuilding with zero or invalid dimensions