masahi commented on a change in pull request #5310: [BYOC] Enhance partitioning 
and external codegen
URL: https://github.com/apache/incubator-tvm/pull/5310#discussion_r407127503
 
 

 ##########
 File path: src/relay/backend/contrib/dnnl/codegen.cc
 ##########
 @@ -128,42 +128,50 @@ std::vector<std::string> Add(const CallNode* call) {
 
 // TODO(@zhiics, @comaniac): This is a basic implementation. We should 
implement
 // all utilities and make a base class for users to implement.
-class CodegenDNNL : public ExprVisitor, public CodegenCBase {
+class CodegenDNNL : public relay::ExprFunctor<std::vector<Output>(const 
Expr&)>,
+                    public CodegenCBase {
  public:
   explicit CodegenDNNL(const std::string& id) { this->ext_func_id_ = id; }
 
-  void VisitExpr_(const VarNode* node) final {
+  std::vector<Output> VisitExpr(const Expr& expr) final {
+    if (visited_.count(expr)) return visited_.at(expr);
 
 Review comment:
   Well it is not necessary, but it would be nice if we could add memo there. 
We don't have to add this overide in `CodegenDNN` and we can clean up many 
duped logic in other derived classes.
   
   But since that would be a big change, I agree that we should proceed with 
this impl for now.

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