fix bug

Author: vslyu

core/trainer.py

@@ -76,9 +76,6 @@ def __init__(self, config=None):
 
         _config = envs.load_yaml(config)
 
-        self._context["env"] = _config
-        self._context["dataset"] = _config.get("dataset")
-
         phases = []
         if phase_names is None:
             phases = _config.get("phase")