/*! * Copyright (c) 2018 by Contributors * \file expr_subst.h * \brief Utility functions for substituting expressions. */ #include <tvm/relay/expr_functor.h> #include "./expr_subst.h" namespace tvm { namespace relay { class ExprSubstituter : public ExprMutator { public: explicit ExprSubstituter(std::unordered_map<Expr, Expr, NodeHash, NodeEqual> subst_map) : subst_map_(subst_map) {} Expr VisitExpr(const Expr& expr) final { auto it = subst_map_.find(expr); if (it != subst_map_.end()) { return ExprMutator::VisitExpr((*it).second); } return ExprMutator::VisitExpr(expr); } private: tvm::Map<Expr, Expr> subst_map_; }; Expr ExprSubst(const Expr& expr, std::unordered_map<Expr, Expr, NodeHash, NodeEqual> subst_map) { return ExprSubstituter(std::move(subst_map)).Mutate(expr); } } // namespace relay } // namespace tvm