fix bug

fleetrec/core/trainers/cluster_trainer.py

@@ -43,12 +43,8 @@ class ClusterTrainer(TranspileTrainer):
             self.regist_context_processor('terminal_pass', self.terminal)
 
     def build_strategy(self):
-        mode = envs.get_global_env("train.strategy.mode")
-
-        if mode is None:
-            mode = envs.get_runtime_envion("train.strategy.mode")
-
-        assert mode is not None
+        mode = envs.get_runtime_envion("trainer.strategy")
+        assert mode in ["async", "geo", "sync", "half_async"]
 
         strategy = None