Fix log dir (#3554)

nni/experiment/launcher.py

@@ -115,7 +115,8 @@ def _start_rest_server(config: ExperimentConfig, port: int, debug: bool, experim
         'mode': ts,
         'experiment_id': experiment_id,
         'start_mode': mode,
-        'log_level': 'debug' if debug else 'info',
+        'log_dir': config.experiment_working_directory,
+        'log_level': 'debug' if debug else 'info'
     }
     if pipe_path is not None:
         args['dispatcher_pipe'] = pipe_path
@@ -166,10 +167,10 @@ def get_stopped_experiment_config(exp_id: str, mode: str) -> None:
     experiments_dict = experiments_config.get_all_experiments()
     experiment_metadata = experiments_dict.get(exp_id)
     if experiment_metadata is None:
-        logging.error('Id %s not exist!', exp_id)
+        _logger.error('Id %s not exist!', exp_id)
         return
     if experiment_metadata['status'] != 'STOPPED':
-        logging.error('Only stopped experiments can be %sed!', mode)
+        _logger.error('Only stopped experiments can be %sed!', mode)
         return
     experiment_config = Config(exp_id, experiment_metadata['logDir']).get_config()
     config = ExperimentConfig(**experiment_config)