pylint code refine & Fix nested example (#848)

* refine code by CI

* fix argument error

* fix nested eample

qlib/workflow/__init__.py

@@ -416,6 +416,11 @@ class QlibRecorder:
             # Case 5
             recorder = R.get_recorder(recorder_id='2e7a4efd66574fa49039e00ffaefa99d', experiment_name='test')
 
+
+        Here are some things users may concern
+        - Q: What recorder will it return if multiple recorder meets the query (e.g. query with experiment_name)
+        - A: If mlflow backend is used, then the recorder with the latest `start_time` will be returned. Because MLflow's `search_runs` function guarantee it
+
         Parameters
         ----------
         recorder_id : str

qlib/workflow/exp.py

@@ -287,6 +287,9 @@ class MLflowExperiment(Experiment):
         """
         Method for getting or creating a recorder. It will try to first get a valid recorder, if exception occurs, it will
         raise errors.
+
+        Quoting docs of search_runs from MLflow
+        > The default ordering is to sort by start_time DESC, then run_id.
         """
         assert (
             recorder_id is not None or recorder_name is not None

qlib/workflow/recorder.py

@@ -355,7 +355,7 @@ class MLflowRecorder(Recorder):
                 shutil.rmtree(Path(path).absolute().parent)
             return data
         except Exception as e:
-            raise LoadObjectError(message=str(e))
+            raise LoadObjectError(str(e))
 
     @AsyncCaller.async_dec(ac_attr="async_log")
     def log_params(self, **kwargs):