Update common.py

Author: GeiduanLiu

source/train/common.py

@@ -147,11 +147,6 @@ def j_must_have_d (jdata, key, deprecated_key) :
 def j_have (jdata, key) :
     return key in jdata.keys() 
 
-def j_whether_in_dict(activation_fn):
-    if activation_fn not in activation_fn_dict:
-        raise RuntimeError(activation_fn+" is not a valid activation function")
-    return activation_fn_dict[activation_fn]
-
 def get_activation_func(activation_fn):
     if activation_fn not in activation_fn_dict:
         raise RuntimeError(activation_fn+" is not a valid activation function")