Thank you very much. I have understand it
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You cannot use `relay.build(...)` to build a model with control flow. For that,
you need to use VM.
See for example,
https://github.com/apache/incubator-tvm/blob/efe3a79aacd934ea5ffb13170230bf199a473e72/tests/python/frontend/pytorch/test_forward.py#L1914
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I want to test the usage of relay while_loop and write the following simple
example
```
x = relay.var("x", shape=(10, 20))
i = relay.var("i", shape=tuple(), dtype="int32")
def myfun(x, i):
z = relay.add(x, relay.const(1, "float32"))
j = relay.add(i, relay.const(1, "in
