zhiics commented on issue #4873: [Relay][FastMath] Relay pass to use fast exp/tanh URL: https://github.com/apache/incubator-tvm/pull/4873#issuecomment-591168801 Adding it to `required_pass` sounds good to me as well since users definitely need to know what they do exactly in this scenario. The only concern I have is that I am not sure if we want to require passes from the higher level? Also, what's the relationship among the passes at opt_level=4? should we run it with other two passes when opt_level=4 is provided? This is not specific to this PR, but I think we probably want a better documentation for the choice of different opt levels.
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