changed some comments.

src/rewrite_rnn.cpp

@@ -29,7 +29,7 @@ void rewrite_rnn::apply_vanilla_rnn(program& prog, instruction_ref ins) const
     assert(ins->name() == "rnn");
     // could be 3 to 6 inputs, but the parse_rnn function will
     // append undefined operators to make 6 arguments when parsing
-    // an onnx file. Another case is user can have only 3 arguments
+    // an onnx file. Another case is user can have num of arguments
     // when writing their program.
     auto args = ins->inputs();
 
@@ -275,9 +275,10 @@ std::vector<instruction_ref> rewrite_rnn::vanilla_rnn_cell(bool is_forward,
 std::vector<operation> rewrite_rnn::vanilla_rnn_actv_funcs(instruction_ref ins) const
 {
     auto rnn_op = any_cast<op::rnn>(ins->get_operator());
-    // before rewrite the rnn operator, need to ensure
-    // we have 2 actv funcs. If less than 2, use the
-    // algorithm in parse_rnn to make 2 actv functions
+    // could be 3 to 6 inputs, but the parse_gru function will
+    // append undefined operators to make 6 arguments when parsing
+    // an onnx file. Another case is user can have any num of arguments
+    // when writing their program.
     if(rnn_op.direction == op::rnn::bidirectional)
     {
         if(rnn_op.actv_funcs.empty())