!303 update ood code docs

Merge pull request !303 from wuxiaoyu123456/code_docs

mindarmour/reliability/concept_drift/concept_drift_check_images.py

@@ -72,6 +72,7 @@ class OodDetector:
     def ood_predict(self, threshold, ds_test):
         """
         The out-of-distribution detection.
+
         Args:
             threshold (float): the threshold to judge ood data. One can set value by experience
                 or use function get_optimal_threshold.