changed to random order but with fixed seed

FWI/src/FWINonlinearSolvers.cpp

@@ -196,8 +196,8 @@ public:
     for (; iter < max_iter; ++iter) {
       std::vector<int> order(num_probs);
       std::iota(order.begin(), order.end(), 1);
-      std::random_device rd;
-      std::mt19937 gen(rd());
+      //      std::random_device rd;
+      std::mt19937 gen(42);
       std::shuffle(order.begin(), order.end(), gen);
       for (size_t i = 0; i < num_probs; ++i) {
         int prob = order[i];