FIX: Added missing spaces in DEBUG messages.

src/LearningMethods/GradientDescent.cpp

@@ -176,13 +176,13 @@ namespace lib4neuro {
         } else {
             COUT_INFO("Gradient Descent method converged after "
                               << this->maximum_niters-iter_idx
-                              << "iterations."
+                              << " iterations."
                               << std::endl);
 #ifdef L4N_DEBUG
             if(ofs && ofs->is_open()) {
                 *ofs << "Gradient Descent method converged after "
                      << this->maximum_niters-iter_idx
-                     << "iterations."
+                     << " iterations."
                      << std::endl;
             }
 #endif