/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ /*! * \file feature.cc * \brief Detect features used in Expr/Module */ #include <tvm/relay/feature.h> #include <tvm/relay/analysis.h> #include <tvm/relay/expr.h> #include <tvm/relay/expr_functor.h> #include <tvm/ir/module.h> #include "../transforms/pass_util.h" namespace tvm { namespace relay { FeatureSet DetectFeature(const Expr& expr) { if (!expr.defined()) { return FeatureSet::No(); } struct FeatureDetector : ExprVisitor { std::unordered_set<Expr, ObjectHash, ObjectEqual> visited_; FeatureSet fs = FeatureSet::No(); void VisitExpr(const Expr& expr) final { if (visited_.count(expr) == 0) { visited_.insert(expr); ExprVisitor::VisitExpr(expr); } else { if (!IsAtomic(expr)) { fs += fGraph; } } } #define DETECT_CONSTRUCT(CONSTRUCT_NAME, STMT) \ void VisitExpr_(const CONSTRUCT_NAME##Node* op) final { \ STMT \ fs += f##CONSTRUCT_NAME; \ } #define DETECT_DEFAULT_CONSTRUCT(CONSTRUCT_NAME) DETECT_CONSTRUCT(CONSTRUCT_NAME, { \ ExprVisitor::VisitExpr_(op); \ }) DETECT_DEFAULT_CONSTRUCT(Var) DETECT_DEFAULT_CONSTRUCT(GlobalVar) DETECT_DEFAULT_CONSTRUCT(Constant) DETECT_DEFAULT_CONSTRUCT(Tuple) DETECT_DEFAULT_CONSTRUCT(TupleGetItem) DETECT_CONSTRUCT(Function, { if (!op->HasNonzeroAttr(attr::kPrimitive)) { ExprVisitor::VisitExpr_(op); } }) DETECT_DEFAULT_CONSTRUCT(Op) DETECT_DEFAULT_CONSTRUCT(Call) DETECT_CONSTRUCT(Let, { for (const Var& v : FreeVars(op->value)) { if (op->var == v) { fs += fLetRec; } } ExprVisitor::VisitExpr_(op); }) DETECT_DEFAULT_CONSTRUCT(If) DETECT_DEFAULT_CONSTRUCT(RefCreate) DETECT_DEFAULT_CONSTRUCT(RefRead) DETECT_DEFAULT_CONSTRUCT(RefWrite) DETECT_DEFAULT_CONSTRUCT(Constructor) DETECT_DEFAULT_CONSTRUCT(Match) #undef DETECT_DEFAULT_CONSTRUCT } fd; fd(expr); return fd.fs; } FeatureSet DetectFeature(const IRModule& mod) { FeatureSet fs = FeatureSet::No(); if (mod.defined()) { for (const auto& f : mod->functions) { fs += DetectFeature(f.second); } } return fs; } Array<Integer> PyDetectFeature(const Expr& expr, const IRModule& mod) { FeatureSet fs = DetectFeature(expr) + DetectFeature(mod); return static_cast<Array<Integer>>(fs); } TVM_REGISTER_GLOBAL("relay.analysis.detect_feature") .set_body_typed(PyDetectFeature); } // namespace relay } // namespace tvm