[BugFix][Ansor] Fixing Ansor Gradient Bug #16739
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Cc @comaniac , @merrymercy , @vinx13 , @jcf94 |
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This change looks a bit hacky and unsafe as you override the cost before calculating the gradients and recover it back afterwards. Intuitively if a task has no schedules, should we just mark it as a dead task and never consider it in the rest of the process? |
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| for task_idx in range(len(self.tasks)): | ||
| if(self.best_costs[task_idx] == 1e10): | ||
| self.dead_tasks.add(task_idx) |
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| for task_idx in range(len(self.tasks)): | |
| if(self.best_costs[task_idx] == 1e10): | |
| self.dead_tasks.add(task_idx) | |
| for task_idx, cost in enumerate(self.best_costs): | |
| if cost == 1e10: | |
| self.dead_tasks.add(task_idx) |
| @@ -358,6 +358,12 @@ def tune( | |||
| self.best_ct = self.ct | |||
| self.best_score = self.cur_score | |||
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| # put task without schedule on warm up to dead state | |||
| if self.strategy == "gradient": | |||
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I feel this logic applies to all strategies instead of just gradient, so this condition may not be necessary. Could you help confirm?
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@tvm-bot rerun |
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Thanks @thaisacs |
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* Fixing ansor gradient bug * Changing to dead_task * Applying reviews
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When Ansor does not find a schedule for a task in warm up, Ansor gradient gets stuck in this task, because there is no optimized schedule for this task. Hence, Ansor does not optimize any task.
Behavior before correction
Behavior after correction