FrozenGene commented on a change in pull request #6184: URL: https://github.com/apache/incubator-tvm/pull/6184#discussion_r467880423
########## File path: src/auto_scheduler/search_policy/utils.cc ########## @@ -0,0 +1,301 @@ +/* + * 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 auto_scheduler/utils.cc + * \brief Common utilities + */ + +#include "utils.h" + +#include <algorithm> + +namespace tvm { +namespace auto_scheduler { + +State DoMultiLevelTiling(const State& state, int stage_id, const std::string& format, + std::vector<int>* spatial_split_step_ids) { + // Temporal object to be used if the input pointer is nullptr + std::vector<int> temp_split_step_ids; + if (spatial_split_step_ids == nullptr) { + spatial_split_step_ids = &temp_split_step_ids; + } + std::vector<std::vector<Iterator>> space_levels; + std::vector<std::vector<Iterator>> reduce_levels; + std::vector<Iterator> space_outer, space_inner, reduce_outer, reduce_inner; + Array<Iterator> split_res; + + for (const auto c : format) { + if (tolower(c) == 's') { + space_levels.emplace_back(); + } else if (tolower(c) == 'r') { + reduce_levels.emplace_back(); + } else { + LOG(FATAL) << "Invalid multi-level tiling format: " << format; + } + } + size_t n_space = space_levels.size(); + size_t n_reduce = reduce_levels.size(); + + spatial_split_step_ids->clear(); + + State tmp_s = state; + const Stage& stage = state->stages[stage_id]; + const auto& no_split_name_pair = GetNoSplitAxisAttr(stage); // handle special split strategy + const std::set<std::string>& no_split_at_inner_name_set = no_split_name_pair.first; + const std::set<std::string>& no_split_at_outer_name_set = no_split_name_pair.second; + + for (const auto& iter : state->stages[stage_id]->iters) { + if (iter->iter_kind == IteratorKind::kSpatial) { + if (!no_split_at_inner_name_set.count(iter->name) && + !no_split_at_outer_name_set.count(iter->name)) { + CHECK_GE(n_space, 1); + + if (n_space == 1) { + space_levels[0].push_back(iter); + } else { + split_res = tmp_s.split(stage_id, iter, Array<Optional<Integer>>(n_space - 1, NullOpt)); + for (size_t i = 0; i < n_space; i++) { + space_levels[i].push_back(split_res[i]); + } + spatial_split_step_ids->push_back(tmp_s->transform_steps.size() - 1); + } + } else { + if (no_split_at_inner_name_set.count(iter->name)) { + space_inner.push_back(iter); + } + if (no_split_at_outer_name_set.count(iter->name)) { + space_outer.push_back(iter); + } + } + } else if (iter->iter_kind == IteratorKind::kReduction) { + if (!no_split_at_inner_name_set.count(iter->name) && + !no_split_at_outer_name_set.count(iter->name)) { + CHECK_GE(n_reduce, 1); + + if (n_reduce == 1) { + reduce_levels[0].push_back(iter); + } else { + split_res = tmp_s.split(stage_id, iter, Array<Optional<Integer>>(n_reduce - 1, NullOpt)); + for (size_t i = 0; i < n_reduce; i++) { + reduce_levels[i].push_back(split_res[i]); + } + } + } else { + if (no_split_at_inner_name_set.count(iter->name)) { + reduce_inner.push_back(iter); + } + if (no_split_at_outer_name_set.count(iter->name)) { + reduce_outer.push_back(iter); + } + } + } else { + LOG(FATAL) << "Invalid iter type: " << int(iter->iter_kind); + } + } + + if (!space_outer.empty()) { + CHECK(!space_levels.empty()); + space_levels.front().insert(space_levels.front().begin(), + std::make_move_iterator(space_outer.begin()), + std::make_move_iterator(space_outer.end())); + } + if (!space_inner.empty()) { + CHECK(!space_levels.empty()); + space_levels.back().insert(space_levels.back().begin(), + std::make_move_iterator(space_inner.begin()), + std::make_move_iterator(space_inner.end())); + } + + if (!reduce_outer.empty()) { + CHECK(!reduce_levels.empty()); + reduce_levels.front().insert(reduce_levels.front().begin(), + std::make_move_iterator(reduce_outer.begin()), + std::make_move_iterator(reduce_outer.end())); + } + if (!reduce_inner.empty()) { + CHECK(!reduce_levels.empty()); + reduce_levels.back().insert(reduce_levels.back().begin(), + std::make_move_iterator(reduce_inner.begin()), + std::make_move_iterator(reduce_inner.end())); + } + + std::vector<Iterator> order; + int space_ct = 0, reduce_ct = 0; + for (const auto c : format) { + if (tolower(c) == 's') { + order.insert(order.end(), std::make_move_iterator(space_levels[space_ct].begin()), + std::make_move_iterator(space_levels[space_ct].end())); + space_ct++; + } else if (tolower(c) == 'r') { + order.insert(order.end(), std::make_move_iterator(reduce_levels[reduce_ct].begin()), + std::make_move_iterator(reduce_levels[reduce_ct].end())); + reduce_ct++; + } else { + LOG(FATAL) << "Invalid multi level tiling format: " << format; + } + } + + tmp_s.reorder(stage_id, order); + return tmp_s; +} + +State FollowTiling(const State& state, int stage_id, const std::vector<int>& split_step_ids, + int n_split) { + if (n_split < 1 || n_split > 3) { + LOG(FATAL) << "Invalid split parts, currently only support 1, 2 and 3"; + } + // Apply up to three-level tiling structure: space_L0, space_L1, space_L2 + std::vector<Iterator> space_0, space_1, space_2, space_3, tmp_order; + Array<Iterator> split_res; + + auto pop = state->stages[stage_id]->op.as<te::ComputeOpNode>(); + CHECK(pop != nullptr); + const Stage& stage = state->stages[stage_id]; + const auto& no_split_name_pair = GetNoSplitAxisAttr(stage); // handle special split strategy Review comment: > need -> not need ? ah, not need it. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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