fix bugs in goss.

src/application/application.cpp

@@ -226,10 +226,10 @@ void Application::Train() {
   int total_iter = config_.boosting_config.num_iterations;
   bool is_finished = false;
   bool need_eval = true;
-  auto start_time = std::chrono::high_resolution_clock::now();
+  auto start_time = std::chrono::steady_clock::now();
   for (int iter = 0; iter < total_iter && !is_finished; ++iter) {
     is_finished = boosting_->TrainOneIter(nullptr, nullptr, need_eval);
-    auto end_time = std::chrono::high_resolution_clock::now();
+    auto end_time = std::chrono::steady_clock::now();
     // output used time per iteration
     Log::Info("%f seconds elapsed, finished iteration %d", std::chrono::duration<double,
       std::milli>(end_time - start_time) * 1e-3, iter + 1);

src/boosting/goss.hpp

@@ -102,8 +102,11 @@ public:
         double prob = (rest_need) / static_cast<double>(rest_all);
         if (cur_rand.NextFloat() < prob) {
           buffer[cur_left_cnt++] = start + i;
-          gradients_[start + i] *= multiply;
-          hessians_[start + i] *= multiply;
+          for (int curr_class = 0; curr_class < num_class_; ++curr_class) {
+            int idx = curr_class * num_data_ + start + i;
+            gradients_[idx] *= multiply;
+            hessians_[idx] *= multiply;
+          }
         } else {
           buffer_right[cur_right_cnt++] = start + i;
         }