Thank you @leeexyz. Yeah, we can use ```tvm.tir.const``` or a new buffer. I means, it there any mechanism to prevent users using python variables within a ```if_scope```. For example, error message to tell users to utilize ```tvm.tir.const``` since it's quite easy to confuse the python variable with tvm Expr. It still works sometimes event thought we define some python variables within a ```if_scope```. That really causes me a lot of trouble.
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