[Relay] Improve build error when no lowered funcs are produced (#4132)

* Improve build error when no lowered funcs * Switch from fatal to warning

[Relay] Improve build error when no lowered funcs are produced (#4132)
* Improve build error when no lowered funcs * Switch from fatal to warning
3185e4ad · Logan Weber · Thierry Moreau · 02c1e117 · 3185e4ad
Commit 3185e4ad authored Oct 17, 2019 by Logan Weber Committed by Thierry Moreau Oct 17, 2019
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src/relay/backend/build_module.cc
+3 -1

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--- a/src/relay/backend/build_module.cc
+++ b/src/relay/backend/build_module.cc
@@ -460,7 +460,9 @@ class RelayBuildModule : public runtime::ModuleNode {
    ret_.params = graph_codegen_->GetParams();

    auto lowered_funcs = graph_codegen_->GetLoweredFunc();
-    if (lowered_funcs.size() != 0) {
+    if (lowered_funcs.size() == 0) {
+      LOG(WARNING) << "no lowered funcs exist in the compiled module";
+    } else {
      ret_.mod = tvm::build(
        lowered_funcs,
        target_host_,