[reward,ci] fix: cast (#4594)

tongyx361 · web-flow · commit 249c0831b793 · 2025-12-18T22:04:47.000+08:00
### What does this PR do?

This PR fixes the import error for the object used in `cast`.
diff --git a/verl/trainer/ppo/reward.py b/verl/trainer/ppo/reward.py
@@ -153,7 +153,7 @@ def load_reward_manager(
         )
         reward_manager_cls_name = reward_manager_cfg.name
         reward_manager_cls = cast(
-            type[AbstractRewardManager],
+            "type[AbstractRewardManager]",
             load_extern_object(module_path=module_cfg.path, object_name=reward_manager_cls_name),
         )
 

Original file line number	Diff line number	Diff line change
`@@ -153,7 +153,7 @@ def load_reward_manager(`
`153`	`153`	`)`
`154`	`154`	`reward_manager_cls_name = reward_manager_cfg.name`
`155`	`155`	`reward_manager_cls = cast(`
`156`		`- type[AbstractRewardManager],`
	`156`	`+ "type[AbstractRewardManager]",`
`157`	`157`	`load_extern_object(module_path=module_cfg.path, object_name=reward_manager_cls_name),`
`158`	`158`	`)`
`159`	`159`