merrymercy opened a new pull request #6660:
URL: https://github.com/apache/incubator-tvm/pull/6660
To avoid the confusion in #6570, we call `del measure_ctx` earlier in the
tutorial, just after we finish the search.
`measure_ctx` overloads the `__del__`. Ideally, we do not need to call `del
measure_ctx` explicitly.
However, I found `__del__` only works for local variables.
If we use `measure_ctx` as a local variable inside a function, it can be
garbage-collected correctly.
But in the tutorial, which is a single script, the `measure_ctx` is a global
varaible. Then it cannot be garbage-collected correctly.
There are two ways to solve this problem.
**S1**. call `del measure_ctx` explicitly
**S2**. use
```
with measure_ctx:
tune_options = ...
s, args = auto_scheduler.auto_schedule(...)
```
I vote for **S1**. In **S1**, `del measure_ctx` is only required if
`measure_ctx` is a global varaible, which is a rare case.
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