update docs

Author: zsdonghao

tensorlayer/rein.py

@@ -92,19 +92,25 @@ def choice_action_by_probs(probs=[0.5, 0.5], action_list=None):
     ------------
     probs : a list of float.
         The probability distribution of all actions.
-    action_list : None or a list of action in integer.
-        If None, return an integer range between 0 and len(probs)-1.
+    action_list : None or a list of action in integer, string or others.
+        If None, returns an integer range between 0 and len(probs)-1.
 
     Examples
     ----------
     >>> for _ in range(5):
-    >>>     a = choice_action_by_probs(probs=[0.2, 0.4, 0.4])
+    >>>     a = choice_action_by_probs([0.2, 0.4, 0.4])
     >>>     print(a)
     ... 0
     ... 1
     ... 1
     ... 2
     ... 1
+    >>> for _ in range(3):
+    >>>     a = choice_action_by_probs([0.5, 0.5], ['a', 'b'])
+    >>>     print(a)
+    ... a
+    ... b
+    ... b
     """
     if action_list is None:
         n_action = len(probs)