If you are using `relay.build()` -> `graph_executor.GraphModule` path, the
point I remember is that it should pass a multi-target dict into `target`
argument of build and pass a device list into GraphModule like
```python
lib = relay.build(relay_mod, target={"cpu": "llvm", "gpu": "cuda"},
params=params)
m = graph_executor.GraphModule(lib["default"](tvm.cpu(), tvm.gpu()))
```
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