Bring back info for finished evalsave. Update tests with the new message.

src/nnue/evaluate_nnue_learner.cpp

@@ -247,7 +247,10 @@ namespace Eval::NNUE {
     // save merit function parameters to a file
     void save_eval(std::string dir_name) {
         auto eval_dir = Path::combine(Options["EvalSaveDir"], dir_name);
-        std::cout << "INFO (save_eval): Saving current evaluation file in " << eval_dir << std::endl;
+
+        auto out = sync_region_cout.new_region();
+
+        out << "INFO (save_eval): Saving current evaluation file in " << eval_dir << std::endl;
 
         // mkdir() will fail if this folder already exists, but
         // Apart from that. If not, I just want you to make it.
@@ -263,5 +266,6 @@ namespace Eval::NNUE {
 #ifndef NDEBUG
         assert(result);
 #endif
+        out << "INFO (save_eval): Saving current evaluation file in " << eval_dir << std::endl;
     }
 }  // namespace Eval::NNUE

tests/instrumented_learn.sh

@@ -129,7 +129,7 @@ cat << EOF > learn01.exp
  send "isready\n"
  send "learn targetdir training_data epochs 1 sfen_read_size 100 thread_buffer_size 10 batchsize 100 use_draw_in_training 1 use_draw_in_validation 1 lr 1 eval_limit 32000 nn_batch_size 30 newbob_decay 0.5 eval_save_interval 30 loss_output_interval 10 validation_set_file_name validation_data/validation_data.bin\n"
 
- expect "save_eval() finished."
+ expect "INFO (save_eval): Saving current evaluation file in"
 
  send "quit\n"
  expect eof