Minor clean up

src/loss_function/LossFunctionPearsonRMSE.cpp

@@ -165,6 +165,7 @@ double LossFunctionPearsonRMSE::operator()(const std::vector<int>& inds)
 
     if(info != 0)
     {
+        std::cout << info << '\t' << tt << std::endl;
         return -1.0 + info / std::abs(info) * 0.5;
     }