fix minor issue in init_experiment (mkdir -> makedirs)

utils.py

@@ -136,7 +136,7 @@ def init_experiment(comment='', name=None):
     CURR_RUN_PATH = os.path.join(PATH_RESULTS, 'runs', curr_run_name)
 
     if not os.path.isdir(CURR_RUN_PATH):
-        os.mkdir(CURR_RUN_PATH)
+        os.makedirs(CURR_RUN_PATH)
 
     # SET UP LOGGING =============================================
     fh = logging.FileHandler(os.path.join(CURR_RUN_PATH, f'{curr_run_name}.log'))