zhiics commented on a change in pull request #4771: [Relay] Added Merge Composite pass URL: https://github.com/apache/incubator-tvm/pull/4771#discussion_r375526504
########## File path: src/relay/pass/merge_composite.cc ########## @@ -0,0 +1,205 @@ +/* + * 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/pass/merge_composite.cc + * \brief Merges expressions matching patterns into functions marked + * as 'composite'. This is primarily intended to be used alongside the + * external codegen infrastructure to support the case where multiple + * Relay operators map to a single external operator. + */ + +#include <tvm/te/operation.h> +#include <tvm/relay/analysis.h> +#include <tvm/relay/expr_functor.h> +#include <tvm/relay/op_attr_types.h> +#include <tvm/relay/transform.h> + +namespace tvm { +namespace relay { +namespace merge_composite { + + +class MergeCompositeWrapper : public ExprMutator { + public: + explicit MergeCompositeWrapper(const std::string& pattern_name, const Expr& pattern) + : pattern_name_(pattern_name), pattern_(pattern) {} + + Expr ExtractPattern(const Var& pattern, const Expr& root, + Map<std::string, Array<Expr>>* var_map) { + if (var_map->find(pattern->name_hint()) == var_map->end()) { + // if we haven't encountered this var yet, make a new free var and associate + // it with the value at 'root' + auto free_var = VarNode::make(pattern->name_hint(), Type()); + var_map->Set(pattern->name_hint(), Array<Expr>({free_var, root})); + return std::move(free_var); + } else { + // if we have encountered this var already, return the free var that was created + return (*var_map)[pattern->name_hint()][0]; + } + } + + Expr ExtractPattern(const Constant& pattern, const Expr& root, + Map<std::string, Array<Expr>>* var_map) { + return root; + } + + /* How does this work? Review comment: Let's document this in the following style \brief \param A ... \param N \return \note How does it work? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
