/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "actions/lua-ranker.h"
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#include "utils/base/logging.h"
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#include "utils/lua-utils.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lauxlib.h"
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#include "lualib.h"
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#ifdef __cplusplus
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}
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#endif
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namespace libtextclassifier3 {
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std::unique_ptr<ActionsSuggestionsLuaRanker>
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ActionsSuggestionsLuaRanker::Create(
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const Conversation& conversation, const std::string& ranker_code,
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const reflection::Schema* entity_data_schema,
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const reflection::Schema* annotations_entity_data_schema,
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ActionsSuggestionsResponse* response) {
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auto ranker = std::unique_ptr<ActionsSuggestionsLuaRanker>(
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new ActionsSuggestionsLuaRanker(
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conversation, ranker_code, entity_data_schema,
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annotations_entity_data_schema, response));
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if (!ranker->Initialize()) {
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TC3_LOG(ERROR) << "Could not initialize lua environment for ranker.";
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return nullptr;
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}
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return ranker;
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}
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bool ActionsSuggestionsLuaRanker::Initialize() {
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return RunProtected([this] {
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LoadDefaultLibraries();
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// Expose generated actions.
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actions_iterator_.NewIterator("actions", &response_->actions,
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state_);
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lua_setglobal(state_, "actions");
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// Expose conversation message stream.
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conversation_iterator_.NewIterator("messages",
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&conversation_.messages, state_);
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lua_setglobal(state_, "messages");
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return LUA_OK;
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}) == LUA_OK;
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}
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int ActionsSuggestionsLuaRanker::ReadActionsRanking() {
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if (lua_type(state_, /*idx=*/-1) != LUA_TTABLE) {
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TC3_LOG(ERROR) << "Expected actions table, got: "
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<< lua_type(state_, /*idx=*/-1);
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lua_pop(state_, 1);
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lua_error(state_);
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return LUA_ERRRUN;
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}
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std::vector<ActionSuggestion> ranked_actions;
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lua_pushnil(state_);
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while (lua_next(state_, /*idx=*/-2)) {
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const int action_id =
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static_cast<int>(lua_tointeger(state_, /*idx=*/-1)) - 1;
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lua_pop(state_, 1);
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if (action_id < 0 || action_id >= response_->actions.size()) {
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TC3_LOG(ERROR) << "Invalid action index: " << action_id;
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lua_error(state_);
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return LUA_ERRRUN;
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}
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ranked_actions.push_back(response_->actions[action_id]);
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}
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lua_pop(state_, 1);
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response_->actions = ranked_actions;
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return LUA_OK;
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}
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bool ActionsSuggestionsLuaRanker::RankActions() {
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if (response_->actions.empty()) {
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// Nothing to do.
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return true;
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}
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if (luaL_loadbuffer(state_, ranker_code_.data(), ranker_code_.size(),
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/*name=*/nullptr) != LUA_OK) {
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TC3_LOG(ERROR) << "Could not load compiled ranking snippet.";
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return false;
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}
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if (lua_pcall(state_, /*nargs=*/0, /*nresults=*/1, /*errfunc=*/0) != LUA_OK) {
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TC3_LOG(ERROR) << "Could not run ranking snippet.";
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return false;
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}
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if (RunProtected([this] { return ReadActionsRanking(); }, /*num_args=*/1) !=
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LUA_OK) {
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TC3_LOG(ERROR) << "Could not read lua result.";
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return false;
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}
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return true;
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}
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} // namespace libtextclassifier3
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