What does -1 means in autotune config?

For example, I used cfg.define_split() to created a tuning space with num_ooutputs = 4. And the best config is [-1, 4, 1, 4]. So my question is what does the -1 means here? Does it mean that the axis of split is invalid?

-1 means N/prod(rest). In your example, -1 will be N/16 where N is the loop extent.

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Got it. Thank you for your reply!