gistfile1.txt

diff --git a/vowpalwabbit/conditional_contextual_bandit.cc b/vowpalwabbit/conditional_contextual_bandit.cc
index c9041e7e3..29200a31a 100644
--- a/vowpalwabbit/conditional_contextual_bandit.cc
+++ b/vowpalwabbit/conditional_contextual_bandit.cc
@@ -420,70 +420,74 @@ void learn_or_predict(ccb& data, multi_learner& base, multi_ex& examples)
 
   auto decision_scores = examples[0]->pred.decision_scores;
 
-  // for each slot, re-build the cb example and call cb_explore_adf
-  size_t slot_id = 0;
-  for (example* slot : data.slots)
-  {
-    // Namespace crossing for slot features.
-    data.generated_interactions.clear();
-    std::copy(data.original_interactions->begin(), data.original_interactions->end(),
-        std::back_inserter(data.generated_interactions));
-    calculate_and_insert_interactions(data.shared, data.actions, data.generated_interactions);
-    data.shared->interactions = &data.generated_interactions;
-    for (auto* ex : data.actions)
+  try {
+    // for each slot, re-build the cb example and call cb_explore_adf
+    size_t slot_id = 0;
+    for (example* slot : data.slots)
     {
-      ex->interactions = &data.generated_interactions;
-    }
+      // Namespace crossing for slot features.
+      data.generated_interactions.clear();
+      std::copy(data.original_interactions->begin(), data.original_interactions->end(),
+          std::back_inserter(data.generated_interactions));
+      calculate_and_insert_interactions(data.shared, data.actions, data.generated_interactions);
+      data.shared->interactions = &data.generated_interactions;
+      for (auto* ex : data.actions)
+      {
+        ex->interactions = &data.generated_interactions;
+      }
 
-    data.include_list.clear();
-    build_cb_example<is_learn>(data.cb_ex, slot, data);
+      data.include_list.clear();
+      build_cb_example<is_learn>(data.cb_ex, slot, data);
 
-    if (data.all->audit)
-    {
-      inject_slot_id<true>(data, data.shared, slot_id);
-    }
-    else
-    {
-      inject_slot_id<false>(data, data.shared, slot_id);
-    }
+      if (data.all->audit)
+      {
+        inject_slot_id<true>(data, data.shared, slot_id);
+      }
+      else
+      {
+        inject_slot_id<false>(data, data.shared, slot_id);
+      }
 
-    if (has_action(data.cb_ex))
-    {
-      // the cb example contains at least 1 action
-      multiline_learn_or_predict<is_learn>(base, data.cb_ex, examples[0]->ft_offset);
-      save_action_scores(data, decision_scores);
-      clear_pred_and_label(data);
-    }
-    else
-    {
-      // the cb example contains no action => cannot decide
-      decision_scores.push_back(data.action_score_pool.get_object());
-    }
+      if (has_action(data.cb_ex))
+      {
+        // the cb example contains at least 1 action
+        multiline_learn_or_predict<is_learn>(base, data.cb_ex, examples[0]->ft_offset);
+        save_action_scores(data, decision_scores);
+        clear_pred_and_label(data);
+      }
+      else
+      {
+        // the cb example contains no action => cannot decide
+        decision_scores.push_back(data.action_score_pool.get_object());
+      }
 
-    data.shared->interactions = data.original_interactions;
-    for (auto* ex : data.actions)
-    {
-      ex->interactions = data.original_interactions;
-    }
-    remove_slot_features(data.shared, slot);
+      data.shared->interactions = data.original_interactions;
+      for (auto* ex : data.actions)
+      {
+        ex->interactions = data.original_interactions;
+      }
+      remove_slot_features(data.shared, slot);
 
-    if (data.all->audit)
-    {
-      remove_slot_id<true>(data.shared);
-    }
-    else
-    {
-      remove_slot_id<false>(data.shared);
+      if (data.all->audit)
+      {
+        remove_slot_id<true>(data.shared);
+      }
+      else
+      {
+        remove_slot_id<false>(data.shared);
+      }
+
+      // Put back the original shared example tag.
+      std::swap(data.shared->tag, slot->tag);
+      slot_id++;
+      data.cb_ex.clear();
     }
 
-    // Put back the original shared example tag.
-    std::swap(data.shared->tag, slot->tag);
-    slot_id++;
-    data.cb_ex.clear();
+    delete_cb_labels(data);
+  } catch (...) {
+    printf("OH YOU FAILED CCB!\n");
   }
 
-  delete_cb_labels(data);
-
   // Restore ccb labels to the example objects.
   for (size_t i = 0; i < examples.size(); i++)
   {