update

Author: merrymercy

src/auto_scheduler/search_policy/sketch_policy_rules.h

@@ -188,7 +188,7 @@ class PopulationMutationRule : public PopulationGenerationRule {
 #define DEFINE_MUTATE_POPULATION_RULE(rule_name)                          \
   class rule_name : public PopulationMutationRule {                       \
    public:                                                                \
-    rule_name(double weight) : PopulationMutationRule(weight) {}          \
+    explicit rule_name(double weight) : PopulationMutationRule(weight) {} \
     ResultKind Apply(SketchPolicyNode* policy, State* state) const final; \
   };