Made entropy positive

torch_modules/src/NeuralNetwork.cpp

@@ -8,7 +8,7 @@ float NeuralNetworkImpl::entropy(torch::Tensor probabilities)
     util::myThrow("Invalid probabilities tensor");
 
   probabilities = torch::clamp(probabilities.unsqueeze(0), 0.00000000001, 1.0);
-  float entropy = torch::sum(probabilities * torch::log(probabilities)).item<float>();
+  float entropy = -torch::sum(probabilities * torch::log(probabilities)).item<float>();
 
   return entropy;
 }