[TVM Discuss] [Questions] Traversing Relay Graph order (source to sink, sink to source)

[Cody H. Yu via TVM Discuss]

Both orders can be implemented using post_order_visit.

Postorder. In this case the first node that processes "do something" would be 
the source node in a DAG.

```python
def visit(self, node):
   super().visit(node)
   // do something
```

Preorder. In this case the first node that processes "do something" would be 
the last node in a DAG.

```python
def visit(self, node):
   // do something
   super().visit(node)
```





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