[TVM Discuss] [Questions] Support of IfNode in graph runtime

["zhang hao (4paradigm) via TVM Discuss" <no...@discuss.tvm.ai>]

When there is an IfNode in the model, it will raise `if is not supported` errror. I saw the error comes from `src/relay/backend/graph_plan_memory.cc`:

```c++
void VisitExpr_(const IfNode* op) final {                                                                                                                                                                                                                                                                                                                                              
  LOG(FATAL) << "if is not supported.";                                                                                                                                                                    
}  
```

Also in `src/relay/backend/graph_runtime_codegen.cc`:

```c++
std::vector<GraphNodeRef> VisitExpr_(const IfNode* op) override {
  throw std::invalid_argument("if not supported");
  return {};
}
```

Is it possible to implement these for IfNode? Any ideas are appreciated. Thanks.





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[TVM Discuss] [Questions] Support of IfNode in graph runtime

["zhang hao (4paradigm) via TVM Discuss" <no...@discuss.tvm.ai>]

Thanks @comaniac for your suggestion. I tried VM, but got segmentation fault when trying to run in VTA (just simulation). Struggle a while to debug, but does not figure it out. In addition, it seems VM does not support heterogenous execution. 

So just wonder if there are lots of works to support IfNode in graph runtime.





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