mbaret commented on a change in pull request #5134: [RELAY] Add MergeCompilerRegions pass URL: https://github.com/apache/incubator-tvm/pull/5134#discussion_r398568581
########## File path: src/relay/transforms/merge_compiler_regions.cc ########## @@ -0,0 +1,352 @@ +/* + * 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 src/relay/transforms/merge_compiler_regions.cc + * + * \brief After operators have been annotated with the targets that support + * them, this pass creates regions of the operators for each target. It + * is guaranteed that the regions will have a topological ordering so that + * no data dependency issues exist. + * + * This pass only introduces annotations to indicate the regions. + * partition_graph must subsequently be called to lift these regions out + * as external functions. + */ + +#include <tvm/relay/analysis.h> +#include <tvm/relay/attrs/annotation.h> +#include <tvm/relay/expr.h> +#include <tvm/ir/error.h> +#include <tvm/relay/expr_functor.h> +#include <tvm/relay/transform.h> + +#include <string> +#include <unordered_map> +#include <unordered_set> +#include <vector> + +#include "../analysis/annotated_region_set.h" + + +namespace tvm { +namespace relay { +namespace partitioning { + +// Cache compiler_begin and compiler_end annotation ops for equivalence check to +// reduce registry lookup overhead. +static const Op& compiler_begin_op = Op::Get("annotation.compiler_begin"); +static const Op& compiler_end_op = Op::Get("annotation.compiler_end"); + +/*! \brief This is a pre-requisite pass to merge-supported pass. + * The AnnotateRestDefault pass will put "default" Compiler Annotations to + * nodes that are not annotated already. This is there to ensure that the + * user will not leave un-annotated nodes MergeCompilerRegions pass is run. + * Why? Because, MergeCompilerRegions pass assumes every node to be annotated. + */ +class AnnotateRestDefault : public ExprMutator { + public: + explicit AnnotateRestDefault(const Expr& expr) { + regions_ = AnnotatedRegionSet::Create(expr, compiler_begin_op, compiler_end_op); + } + + Expr Annotate(const Expr& expr) { + // Its a function that is being passed on to annotate + func_ = Downcast<Function>(expr); + + // Corner Case CC1 : If the last node does not belong + // to a region nede to add a compiler_end + auto region = regions_->GetRegion(func_->body); + auto mutated_expr = this->VisitExpr(expr); + if (!region.defined()) { + func_ = Downcast<Function>(mutated_expr); + // CC1 : add that compiler end after mutation + auto body = AddCompilerEnd_(func_->body); + func_ = Function(func_->params, body, + body->checked_type_, {}, DictAttrs()); + return Downcast<Expr>(func_); + } else { + return mutated_expr; + } + } + + /*! \brief This function adds compiler ends to nodes that + * have a region AND they should not be arguments of the + * original function + * \param expr + * \return expr + */ + Expr AddCompilerEnd(const Expr& expr) { + auto region = regions_->GetRegion(expr); + auto visited_expr = VisitExpr(expr); + + // The compiler ends are added to nodes that does have a region + // AND they should not be arguments of the original function + if (!region.defined() && + std::find(func_->params.begin(), + func_->params.end(), visited_expr) + == func_->params.end()) { + return AddCompilerEnd_(visited_expr); + } else { + return visited_expr; + } + } + + Expr AddCompilerEnd_(const Expr& expr) { + const auto* end_op = + runtime::Registry::Get("relay.op.annotation._make.compiler_end"); + CHECK(end_op); + Expr end = (*end_op)(expr, target_); + return end; + } + + Expr VisitExpr_(const CallNode* call) final { + auto op_node = call->op.as<OpNode>(); + auto ret = GetRef<Call>(call); + + Array<Expr> args; + + // Add compiler ends if the parent is supported + for (auto arg : call->args) { + args.push_back(AddCompilerEnd(arg)); + } + + if (op_node == nullptr || call->attrs.as<CompilerAttrs>() == nullptr) { + // Skip annotatation ops, only add default compiler to actual compute nodes + + auto region = regions_->GetRegion(ret); + if (!region.defined()) { + // if the current node does not belong to annotated region + // annotate the all incoming edges (args) + // with "default" compile_begin and compiler_end annotations. + tvm::Array<tvm::relay::Expr> compiler_begins; + for (auto arg : args) { + const auto* begin_op = Review comment: This is the make function not the Op itself, so it doesn't seem to work. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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