simpilify distribute transpiler

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -1284,20 +1284,8 @@ class DistributeTranspiler(object):
         # If one op's input is another op's output or
         # one op's output is another op's input, we say
         # the two operator is connected.
-        def _append_inname(varname_list):
-            op_input_names = []
-            for in_name in varname_list:
-                op_input_names.append(in_name)
-            return op_input_names
-
-        op1_input_names = _append_inname(op1.desc.input_arg_names())
-        op1_output_names = op1.desc.output_arg_names()
-
-        op2_input_names = _append_inname(op2.desc.input_arg_names())
-        op2_output_names = op2.desc.output_arg_names()
-
-        if set(op1_output_names) & set(op2_input_names) or \
-           set(op1_input_names) & set(op2_output_names):
+        if set(op1.desc.output_arg_names()) & set(op2.desc.input_arg_names()) or \
+           set(op1.desc.input_arg_names()) & set(op2.desc.output_arg_names()):
             return True
         return False