Normalize non-finite metric export to null

code/rr_label_study/oven_study.py

@@ -2896,12 +2896,12 @@ def run_study(
         with result_path.joinpath(f"{episode_dir.name}.metrics.json").open(
             "w", encoding="utf-8"
         ) as handle:
-            json.dump(artifacts.metrics, handle, indent=2)
+            json.dump(_json_safe(artifacts.metrics), handle, indent=2, allow_nan=False)
         episode_metrics.append(artifacts.metrics)
 
     summary = _aggregate_summary(episode_metrics)
     with result_path.joinpath("summary.json").open("w", encoding="utf-8") as handle:
-        json.dump(summary, handle, indent=2)
+        json.dump(_json_safe(summary), handle, indent=2, allow_nan=False)
     return summary
 
 
@@ -2960,7 +2960,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
         independent_replay=args.independent_replay,
         per_episode_templates=args.per_episode_templates,
     )
-    print(json.dumps(summary, indent=2))
+    print(json.dumps(_json_safe(summary), indent=2, allow_nan=False))
     return 0