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// Copyright 2018 Google LLC
//
// Licensed 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.
#include <stdio.h>
#include <atomic>
#include <cmath>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
#include <thread>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "absl/strings/str_split.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "cc/constants.h"
#include "cc/dual_net/factory.h"
#include "cc/file/path.h"
#include "cc/file/utils.h"
#include "cc/game.h"
#include "cc/game_utils.h"
#include "cc/init.h"
#include "cc/logging.h"
#include "cc/mcts_player.h"
#include "cc/model/batching_model.h"
#include "cc/model/model.h"
#include "cc/random.h"
#include "cc/tf_utils.h"
#include "cc/zobrist.h"
#include "gflags/gflags.h"
// Game options flags.
DEFINE_bool(resign_enabled, true, "Whether resign is enabled.");
DEFINE_double(resign_threshold, -0.999, "Resign threshold.");
DEFINE_uint64(seed, 0,
"Random seed. Use default value of 0 to use a time-based seed.");
// Tree search flags.
DEFINE_int32(num_readouts, 100,
"Number of readouts to make during tree search for each move.");
DEFINE_int32(virtual_losses, 8,
"Number of virtual losses when running tree search.");
DEFINE_double(value_init_penalty, 2.0,
"New children value initialization penalty.\n"
"Child value = parent's value - penalty * color, clamped to"
" [-1, 1]. Penalty should be in [0.0, 2.0].\n"
"0 is init-to-parent, 2.0 is init-to-loss [default].\n"
"This behaves similiarly to Leela's FPU \"First Play Urgency\".");
// Inference flags.
DEFINE_string(eval_model, "",
"Path to a minigo model to evaluate against a target.");
DEFINE_string(eval_engine, "tf", "Inference engine to use for the eval model.");
DEFINE_string(eval_device, "", "Device to run eval inference on.");
DEFINE_string(target_model, "",
"Path to a target minigo model that eval_model is evaluated "
"against.");
DEFINE_string(target_engine, "tf", "Inference engine to use for the eval model.");
DEFINE_string(target_device, "", "Device to run target inference on.");
DEFINE_int32(parallel_games, 32, "Number of games to play in parallel.");
// Output flags.
DEFINE_string(output_bigtable, "",
"Output Bigtable specification, of the form: "
"project,instance,table. "
"If empty, no examples are written to Bigtable.");
DEFINE_string(sgf_dir, "",
"SGF directory for selfplay and puzzles. If empty in selfplay "
"mode, no SGF is written.");
DEFINE_string(bigtable_tag, "", "Used in Bigtable metadata");
namespace minigo {
namespace {
void ParseOptionsFromFlags(Game::Options* game_options,
MctsPlayer::Options* player_options) {
game_options->resign_enabled = FLAGS_resign_enabled;
game_options->resign_threshold = -std::abs(FLAGS_resign_threshold);
player_options->virtual_losses = FLAGS_virtual_losses;
player_options->num_readouts = FLAGS_num_readouts;
player_options->inject_noise = false;
player_options->tree.value_init_penalty = FLAGS_value_init_penalty;
player_options->tree.soft_pick_enabled = false;
}
class Evaluator {
class EvaluatedModel {
public:
EvaluatedModel(BatchingModelFactory* batcher, const std::string& path)
: batcher_(batcher), path_(path) {}
BatchingModelFactory* batcher() { return batcher_; }
std::string name() {
absl::MutexLock lock(&mutex_);
if (name_.empty()) {
// The model's name is lazily initialized the first time we create a
// instance. Make sure it's valid.
NewModelImpl();
}
return name_;
}
WinStats GetWinStats() const {
absl::MutexLock lock(&mutex_);
return win_stats_;
}
void UpdateWinStats(const Game& game) {
absl::MutexLock lock(&mutex_);
win_stats_.Update(game);
}
std::unique_ptr<Model> NewModel() {
absl::MutexLock lock(&mutex_);
return NewModelImpl();
}
private:
std::unique_ptr<Model> NewModelImpl() EXCLUSIVE_LOCKS_REQUIRED(&mutex_) {
auto model = batcher_->NewModel(path_);
if (name_.empty()) {
name_ = model->name();
}
return model;
}
mutable absl::Mutex mutex_;
BatchingModelFactory* batcher_ GUARDED_BY(&mutex_);
const std::string path_;
std::string name_ GUARDED_BY(&mutex_);
WinStats win_stats_ GUARDED_BY(&mutex_);
};
public:
Evaluator() {
// Create a batcher for the eval model.
batchers_.push_back(absl::make_unique<BatchingModelFactory>(
NewModelFactory(FLAGS_eval_engine, FLAGS_eval_device), 2));
// If the target model requires a different factory, create one & a second
// batcher too.
if (FLAGS_target_engine != FLAGS_eval_engine ||
FLAGS_target_device != FLAGS_eval_device) {
batchers_.push_back(absl::make_unique<BatchingModelFactory>(
NewModelFactory(FLAGS_target_engine, FLAGS_target_device), 2));
}
}
void Run() {
auto start_time = absl::Now();
EvaluatedModel eval_model(batchers_.front().get(), FLAGS_eval_model);
EvaluatedModel target_model(batchers_.back().get(), FLAGS_target_model);
ParseOptionsFromFlags(&game_options_, &player_options_);
int num_games = FLAGS_parallel_games;
for (int thread_id = 0; thread_id < num_games; ++thread_id) {
bool swap_models = (thread_id & 1) != 0;
threads_.emplace_back(std::bind(&Evaluator::ThreadRun, this, thread_id,
swap_models ? &target_model : &eval_model,
swap_models ? &eval_model : &target_model));
}
for (auto& t : threads_) {
t.join();
}
MG_LOG(INFO) << "Evaluated " << num_games << " games, total time "
<< (absl::Now() - start_time);
MG_LOG(INFO) << FormatWinStatsTable(
{{eval_model.name(), eval_model.GetWinStats()},
{target_model.name(), target_model.GetWinStats()}});
}
private:
void ThreadRun(int thread_id, EvaluatedModel* black_model,
EvaluatedModel* white_model) {
// Only print the board using ANSI colors if stderr is sent to the
// terminal.
const bool use_ansi_colors = FdSupportsAnsiColors(fileno(stderr));
// The player and other_player reference this pointer.
std::unique_ptr<Model> model;
std::vector<std::string> bigtable_spec =
absl::StrSplit(FLAGS_output_bigtable, ',');
bool use_bigtable = bigtable_spec.size() == 3;
if (!FLAGS_output_bigtable.empty() && !use_bigtable) {
MG_LOG(FATAL)
<< "Bigtable output must be of the form: project,instance,table";
return;
}
Game game(black_model->name(), white_model->name(), game_options_);
const bool verbose = thread_id == 0;
auto black = absl::make_unique<MctsPlayer>(black_model->NewModel(), nullptr,
&game, player_options_);
auto white = absl::make_unique<MctsPlayer>(white_model->NewModel(), nullptr,
832A
&game, player_options_);
BatchingModelFactory::StartGame(black->model(), white->model());
auto* curr_player = black.get();
auto* next_player = white.get();
while (!game.game_over()) {
if (curr_player->root()->position.n() >= kMinPassAliveMoves &&
curr_player->root()->position.CalculateWholeBoardPassAlive()) {
// Play pass moves to end the game.
while (!game.game_over()) {
MG_CHECK(curr_player->PlayMove(Coord::kPass));
next_player->PlayOpponentsMove(Coord::kPass);
std::swap(curr_player, next_player);
}
break;
}
auto move = curr_player->SuggestMove(player_options_.num_readouts);
if (verbose) {
std::cerr << curr_player->tree().Describe() << "\n";
}
MG_CHECK(curr_player->PlayMove(move));
next_player->PlayOpponentsMove(move);
if (verbose) {
MG_LOG(INFO) << absl::StreamFormat(
"%d: %s by %s\nQ: %0.4f", curr_player->root()->position.n(),
move.ToGtp(), curr_player->name(), curr_player->root()->Q());
MG_LOG(INFO) << curr_player->root()->position.ToPrettyString(
use_ansi_colors);
}
std::swap(curr_player, next_player);
}
BatchingModelFactory::EndGame(black->model(), white->model());
if (game.result() > 0) {
black_model->UpdateWinStats(game);
} else {
white_model->UpdateWinStats(game);
}
if (verbose) {
MG_LOG(INFO) << game.result_string();
MG_LOG(INFO) << "Black was: " << game.black_name();
}
// Write SGF.
std::string output_name = "NO_SGF_SAVED";
if (!FLAGS_sgf_dir.empty()) {
output_name = absl::StrCat(GetOutputName(game_id_++), "-", black->name(),
"-", white->name());
game.AddComment(
absl::StrCat("B inferences: ", black->GetModelsUsedForInference()));
game.AddComment(
absl::StrCat("W inferences: ", white->GetModelsUsedForInference()));
WriteSgf(FLAGS_sgf_dir, output_name, game, true);
}
if (use_bigtable) {
const auto& gcp_project_name = bigtable_spec[0];
const auto& instance_name = bigtable_spec[1];
const auto& table_name = bigtable_spec[2];
tf_utils::WriteEvalRecord(gcp_project_name, instance_name, table_name,
game, output_name, FLAGS_bigtable_tag);
}
MG_LOG(INFO) << "Thread " << thread_id << " stopping";
}
Game::Options game_options_;
MctsPlayer::Options player_options_;
std::vector<std::thread> threads_;
std::atomic<size_t> game_id_{0};
std::vector<std::unique_ptr<BatchingModelFactory>> batchers_;
};
} // namespace
} // namespace minigo
int main(int argc, char* argv[]) {
minigo::Init(&argc, &argv);
minigo::zobrist::Init(FLAGS_seed);
minigo::Evaluator evaluator;
evaluator.Run();
return 0;
}