[GitHub] [incubator-tvm] jcf94 commented on a change in pull request #6141: [Ansor][AutoTVM v2.0] Phase 1: Add pragma/storage_align/rfactor steps

[GitBox <gi...@apache.org>]

jcf94 commented on a change in pull request #6141:
URL: https://github.com/apache/incubator-tvm/pull/6141#discussion_r460680154



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File path: src/auto_scheduler/transform_step.cc
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@@ -967,11 +1162,27 @@ String ComputeRootStepNode::PrintAsPythonAPI(Array<te::Stage>* stages,
  */
 Array<Step> GetFormerStageModifiableSteps(Step current_step, const Array<Step>& transform_steps) {
   Array<Step> ret_steps;
-  for (const Step& step : transform_steps) {
+  for (size_t i = 0; i < transform_steps.size(); ++i) {
+    const Step& step = transform_steps[i];
     if (step->IsInstance<CacheWriteStepNode>() || step->IsInstance<CacheReadStepNode>()) {
       ret_steps.push_back(step);
+    } else if (step->IsInstance<RfactorStepNode>()) {
+      // add FuseStepNode required by rfactor
+      if (i >= 2 && transform_steps[i - 2]->IsInstance<FuseStepNode>()) {
+        const Step& fuse_step = transform_steps[i - 2];
+        if (fuse_step->stage_id == step->stage_id) {
+          ret_steps.push_back(fuse_step);
+        }
+      }
+      // add SplitStepNode required by rfactor
+      CHECK_GE(i, 1);
+      CHECK(transform_steps[i - 1]->IsInstance<SplitStepNode>());
+      const Step& split_step = transform_steps[i - 1];
+      CHECK_EQ(split_step->stage_id, step->stage_id);
+      ret_steps.push_back(split_step);
+      // add RfactorStepNode
+      ret_steps.push_back(step);

Review comment:
       These checks here are specialized for the Rfactor in our search policy, will the rules be kept like this?




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