[MetaSchedule][Minor]Fix Random State Fork in TuneContext Clone Function (#12811)

zxybazh · web-flow · commit 6b3be496e6ac · 2022-09-16T21:11:07.000+08:00
Fix random state fork in TuneContext Clone function.
diff --git a/src/meta_schedule/tune_context.cc b/src/meta_schedule/tune_context.cc
@@ -74,6 +74,7 @@ TuneContext TuneContextNode::Clone() const {
   }
   if (this->space_generator.defined()) n->space_generator = this->space_generator.value()->Clone();
   if (this->search_strategy.defined()) n->search_strategy = this->search_strategy.value()->Clone();
+  n->rand_state = support::LinearCongruentialEngine(&n->rand_state).ForkSeed();
   n->Initialize();
   return TuneContext(n);
 }

Original file line number	Diff line number	Diff line change
`@@ -74,6 +74,7 @@ TuneContext TuneContextNode::Clone() const {`
`74`	`74`	`}`
`75`	`75`	`if (this->space_generator.defined()) n->space_generator = this->space_generator.value()->Clone();`
`76`	`76`	`if (this->search_strategy.defined()) n->search_strategy = this->search_strategy.value()->Clone();`
	`77`	`+ n->rand_state = support::LinearCongruentialEngine(&n->rand_state).ForkSeed();`
`77`	`78`	`n->Initialize();`
`78`	`79`	`return TuneContext(n);`
`79`	`80`	`}`