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node.cpp
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/*
CrazyAra, a deep learning chess variant engine
Copyright (C) 2018 Johannes Czech, Moritz Willig, Alena Beyer
Copyright (C) 2019-2020 Johannes Czech
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*
* @file: node.cpp
* Created on 28.08.2019
* @author: queensgambit
*/
#include "node.h"
#include <limits.h>
#include "util/blazeutil.h" // get_dirichlet_noise()
#include "constants.h"
#include "../util/communication.h"
#include "evalinfo.h"
bool Node::is_sorted() const
{
return sorted;
}
double Node::get_q_sum_virtual_loss(ChildIdx childIdx) const
{
return get_child_number_visits(childIdx) * double(get_q_value(childIdx)) + get_virtual_loss_counter(childIdx);
}
bool Node::is_transposition() const
{
return numberParentNodes != 1;
}
void Node::decrement_number_parents()
{
--numberParentNodes;
}
uint8_t Node::get_virtual_loss_counter(ChildIdx childIdx) const
{
return d->virtualLossCounter[childIdx];
}
bool Node::has_transposition_child_node()
{
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* childNode = it->get();
if (childNode != nullptr && childNode->is_transposition()) {
return true;
}
}
return false;
}
#ifdef MCTS_STORE_STATES
StateObj* Node::get_state() const
{
return state.get();
}
void Node::set_auxiliary_outputs(const float* auxiliaryOutputs)
{
state->set_auxiliary_outputs(auxiliaryOutputs);
}
#endif
Node::Node(StateObj* state, const SearchSettings* searchSettings):
legalActions(state->legal_actions()),
key(state->hash_key()),
valueSum(0),
d(nullptr),
#ifdef MCTS_STORE_STATES
state(state),
#endif
realVisitsSum(0),
pliesFromNull(state->steps_from_null()),
numberParentNodes(1),
isTerminal(false),
isTablebase(false),
hasNNResults(false),
sorted(false)
{
// specify the number of direct child nodes of this node
check_for_terminal(state);
#ifdef MCTS_TB_SUPPORT
if (searchSettings->useTablebase && !isTerminal) {
check_for_tablebase_wdl(state);
}
#endif
policyProbSmall.resize(legalActions.size());
}
bool Node::solved_win(const Node* childNode, const SearchSettings* searchSettings) const
{
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
return childNode->d->nodeType == LOSS;
case MODE_SINGLE_PLAYER:
default:
return childNode->d->nodeType == WIN;
}
}
bool Node::solved_draw(const Node* childNode, const SearchSettings* searchSettings) const
{
if (d->numberUnsolvedChildNodes == 0) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (childNode->d->nodeType != LOSS) {
return at_least_one_drawn_child();
}
break;
case MODE_SINGLE_PLAYER:
if (childNode->d->nodeType != WIN) {
return at_least_one_drawn_child();
}
}
}
return false;
}
bool Node::at_least_one_drawn_child() const
{
bool atLeastOneDrawnChild = false;
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* childNode = it->get();
if (!childNode->is_playout_node() || (childNode->d->nodeType != DRAW && childNode->d->nodeType != WIN)) {
return false;
}
if (childNode->d->nodeType == DRAW) {
atLeastOneDrawnChild = true;
}
}
return atLeastOneDrawnChild;
}
bool Node::only_won_child_nodes() const
{
return only_child_nodes_of_one_kind<WIN>();
}
bool Node::solved_loss(const Node* childNode, const SearchSettings* searchSettings) const
{
if (d->numberUnsolvedChildNodes == 0) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (childNode->d->nodeType == WIN) {
return only_won_child_nodes();
}
break;
case MODE_SINGLE_PLAYER:
if (childNode->d->nodeType == LOSS) {
return only_child_nodes_of_one_kind<LOSS>();
}
}
}
return false;
}
void Node::mark_as_loss()
{
set_value(LOSS_VALUE);
d->nodeType = LOSS;
}
void Node::mark_as_draw()
{
set_value(DRAW_VALUE);
d->nodeType = DRAW;
}
void Node::mark_as_win()
{
set_value(WIN_VALUE);
d->nodeType = WIN;
}
#ifdef MCTS_TB_SUPPORT
bool Node::solve_tb_win(const Node* childNode, const SearchSettings* searchSettings) const
{
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
return childNode->d->nodeType == TB_LOSS;
case MODE_SINGLE_PLAYER:
default:
return childNode->d->nodeType == TB_WIN;
}
}
bool Node::solved_tb_draw(const Node* childNode, const SearchSettings* searchSettings) const
{
if (d->numberUnsolvedChildNodes == 0) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (childNode->d->nodeType != TB_LOSS || childNode->d->nodeType == LOSS) {
return at_least_one_drawn_child();
}
break;
case MODE_SINGLE_PLAYER:
if (childNode->d->nodeType != TB_WIN || childNode->d->nodeType == WIN) {
return at_least_one_drawn_child();
}
}
}
return false;
}
bool Node::solved_tb_loss(const Node* childNode, const SearchSettings* searchSettings) const
{
if (d->numberUnsolvedChildNodes == 0) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (childNode->d->nodeType == TB_WIN) {
return only_won_tb_child_nodes();
}
break;
case MODE_SINGLE_PLAYER:
if (childNode->d->nodeType == TB_LOSS) {
return only_child_nodes_of_one_kind<TB_LOSS>();
}
}
}
return false;
}
bool Node::only_won_tb_child_nodes() const
{
return only_child_nodes_of_one_kind<TB_WIN>();
}
void Node::mark_as_tb_loss()
{
set_value(LOSS_VALUE);
d->nodeType = TB_LOSS;
}
void Node::mark_as_tb_draw()
{
set_value(DRAW_VALUE);
d->nodeType = TB_DRAW;
}
void Node::mark_as_tb_win()
{
set_value(WIN_VALUE);
d->nodeType = TB_WIN;
}
#endif
void Node::define_end_ply_for_solved_terminal(const Node* childNode)
{
if (d->nodeType == LOSS) {
// choose the longest pv line
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* curChildNode = it->get();
if (curChildNode->d->endInPly+1 > d->endInPly) {
d->endInPly = curChildNode->d->endInPly+1;
}
}
return;
}
if (d->nodeType == DRAW) {
// choose the shortest pv line for draws
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* curChildNode = it->get();
if (curChildNode->d->nodeType == DRAW && curChildNode->d->endInPly+1 < d->endInPly) {
d->endInPly = curChildNode->d->endInPly+1;
}
}
return;
}
// get the endPly for WINS
d->endInPly = childNode->d->endInPly + 1;
}
template <int targetValue>
void Node::update_solved_terminal(const Node* childNode, ChildIdx childIdx)
{
define_end_ply_for_solved_terminal(childNode);
set_value(targetValue);
d->qValues[childIdx] = targetValue;
}
void Node::mcts_policy_based_on_wins(DynamicVector<double> &mctsPolicy, const SearchSettings* searchSettings) const
{
mctsPolicy = 0;
ChildIdx childIdx = 0;
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* childNode = it->get();
if (childNode != nullptr && childNode->d != nullptr) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (childNode->d->nodeType == LOSS) {
mctsPolicy[childIdx] = 1.0f;
}
break;
case MODE_SINGLE_PLAYER:
if (childNode->d->nodeType == WIN) {
mctsPolicy[childIdx] = 1.0f;
}
}
}
++childIdx;
}
}
void Node::mcts_policy_based_on_losses(DynamicVector<double> &mctsPolicy) const
{
mctsPolicy = 0;
ChildIdx childIdx = 0;
ChildIdx longestChildIdx = 0;
size_t endInPly = 0;
for (auto it = d->childNodes.begin(); it != d->childNodes.end(); ++it) {
const Node* childNode = it->get();
if (childNode != nullptr && childNode->d != nullptr) {
if (childNode->d->endInPly > endInPly) {
endInPly = childNode->d->endInPly;
longestChildIdx = childIdx;
}
}
++childIdx;
}
mctsPolicy[longestChildIdx] = 1.0f;
}
void Node::prune_losses_in_mcts_policy(DynamicVector<double> &mctsPolicy, const SearchSettings* searchSettings) const
{
// check if PV line leads to a loss
if (d->numberUnsolvedChildNodes != get_number_child_nodes() && !is_loss_node_type(d->nodeType)) {
// set all entries which lead to a WIN of the opponent to zero
for (size_t childIdx = 0; childIdx < d->noVisitIdx; ++childIdx) {
const Node* childNode = d->childNodes[childIdx].get();
if (childNode != nullptr && childNode->is_playout_node()) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (is_win_node_type(childNode->d->nodeType)) {
mctsPolicy[childIdx] = 0;
}
break;
case MODE_SINGLE_PLAYER:
if (is_loss_node_type(childNode->d->nodeType)) {
mctsPolicy[childIdx] = 0;
}
}
}
}
}
}
bool Node::solve_for_terminal(ChildIdx childIdx, const SearchSettings* searchSettings)
{
const Node* childNode = d->childNodes[childIdx].get();
if (!childNode->is_playout_node()) {
return false;
}
if (childNode->d->nodeType == UNSOLVED) {
return false;
}
#ifdef MCTS_TB_SUPPORT
// disable draws for winning tb positions
if (d->nodeType == TB_WIN) {
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (is_win_node_type(childNode->d->nodeType) || is_draw_node_type(childNode->d->nodeType)) {
disable_action(childIdx);
}
break;
case MODE_SINGLE_PLAYER:
if (is_loss_node_type(childNode->d->nodeType) || is_draw_node_type(childNode->d->nodeType)) {
disable_action(childIdx);
}
}
}
#endif
if (d->nodeType == WIN || d->nodeType == LOSS || d->nodeType == DRAW) {
// already solved
return false;
}
if (d->nodeTypes[childIdx] == UNSOLVED) {
--d->numberUnsolvedChildNodes;
d->nodeTypes[childIdx] = childNode->d->nodeType;
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
switch(childNode->d->nodeType) {
case WIN:
disable_action(childIdx);
default: ; // pass
}
break;
case MODE_SINGLE_PLAYER:
switch(childNode->d->nodeType) {
case LOSS:
disable_action(childIdx);
default: ; // pass
}
}
}
if (solved_win(childNode, searchSettings)) {
d->nodeType = WIN;
update_solved_terminal<WIN_VALUE>(childNode, childIdx);
d->checkmateIdx = childIdx;
return true;
}
if (solved_loss(childNode, searchSettings)) {
d->nodeType = LOSS;
update_solved_terminal<LOSS_VALUE>(childNode, childIdx);
return true;
}
if (solved_draw(childNode, searchSettings)) {
d->nodeType = DRAW;
update_solved_terminal<DRAW_VALUE>(childNode, childIdx);
return true;
}
#ifdef MCTS_TB_SUPPORT
if (solve_tb_win(childNode, searchSettings)) {
d->nodeType = TB_WIN;
update_solved_terminal<WIN_VALUE>(childNode, childIdx);
return true;
}
if (solved_tb_draw(childNode, searchSettings)) {
d->nodeType = TB_DRAW;
update_solved_terminal<DRAW_VALUE>(childNode, childIdx);
return true;
}
if (solved_tb_loss(childNode, searchSettings)) {
d->nodeType = TB_LOSS;
update_solved_terminal<LOSS_VALUE>(childNode, childIdx);
return true;
}
#endif
return false;
}
bool Node::is_root_node() const
{
return numberParentNodes == 0;
}
Node::~Node()
{
}
void Node::sort_moves_by_probabilities()
{
auto p = sort_permutation(policyProbSmall, std::greater<float>());
apply_permutation_in_place(policyProbSmall, p);
apply_permutation_in_place(legalActions, p);
sorted = true;
}
Action Node::get_action(ChildIdx childIdx) const
{
return legalActions[childIdx];
}
Node *Node::get_child_node(ChildIdx childIdx) const
{
return d->childNodes[childIdx].get();
}
shared_ptr<Node> Node::get_child_node_shared(ChildIdx childIdx) const
{
return d->childNodes[childIdx];
}
vector<shared_ptr<Node>>::const_iterator Node::get_node_it_begin() const
{
return d->childNodes.begin();
}
vector<shared_ptr<Node>>::const_iterator Node::get_node_it_end() const
{
return d->childNodes.end();
}
bool Node::is_terminal() const
{
return isTerminal;
}
bool Node::has_nn_results() const
{
return hasNNResults;
}
void Node::apply_virtual_loss_to_child(ChildIdx childIdx, const SearchSettings* searchSettings)
{
// update the stats of the parent node
// make it look like if one has lost X games from this node forward where X is the virtual loss value
// temporarily reduce the attraction of this node by applying a virtual loss /
// the effect of virtual loss will be undone if the playout is over
switch (get_virtual_style(searchSettings, d->childNumberVisits[childIdx])) {
case VIRTUAL_LOSS:
d->qValues[childIdx] = (double(d->qValues[childIdx]) * d->childNumberVisits[childIdx] - 1) / double(d->childNumberVisits[childIdx] + 1);
break;
case VIRTUAL_OFFSET:
d->qValues[childIdx] -= searchSettings->virtualOffsetStrenght;
case VIRTUAL_VISIT: ; // ignore
case VIRTUAL_MIX: ; // unreachable
}
// virtual increase the number of visits
++d->childNumberVisits[childIdx];
++d->visitSum;
// increment virtual loss counter
update_virtual_loss_counter<true>(childIdx);
}
float Node::get_q_value(ChildIdx childIdx) const
{
return d->qValues[childIdx];
}
DynamicVector<float> Node::get_q_values() const
{
return d->qValues;
}
void Node::set_q_value(ChildIdx childIdx, float value)
{
d->qValues[childIdx] = value;
}
ChildIdx Node::get_best_q_idx() const
{
return argmax(d->qValues);
}
vector<ChildIdx> Node::get_q_idx_over_thresh(float qThresh)
{
vector<ChildIdx> indices;
for (ChildIdx idx = 0; idx < size(d->qValues); ++idx) {
if (d->qValues[idx] > qThresh) {
indices.emplace_back(idx); }
}
return indices;
}
void Node::reserve_full_memory()
{
const size_t numberChildNodes = get_number_child_nodes();
d->childNumberVisits.reserve(numberChildNodes);
d->qValues.reserve(numberChildNodes);
d->childNodes.reserve(numberChildNodes);
d->virtualLossCounter.reserve(numberChildNodes);
d->nodeTypes.reserve(numberChildNodes);
}
void Node::increment_no_visit_idx()
{
if (d->noVisitIdx < get_number_child_nodes()) {
++d->noVisitIdx;
if (d->noVisitIdx == PRESERVED_ITEMS) {
reserve_full_memory();
}
d->add_empty_node();
}
}
void Node::fully_expand_node()
{
if (!is_fully_expanded()) {
reserve_full_memory();
for (size_t idx = d->noVisitIdx; idx < get_number_child_nodes(); ++idx) {
d->add_empty_node();
}
d->noVisitIdx = get_number_child_nodes();
// keep this exact order
sorted = true;
}
}
float Node::get_value() const
{
return valueSum / realVisitsSum;
}
float Node::get_value_display() const
{
if (is_win_node_type(d->nodeType)) {
return WIN_VALUE;
}
if (is_loss_node_type(d->nodeType)) {
return LOSS_VALUE;
}
if (is_draw_node_type(d->nodeType)) {
return DRAW_VALUE;
}
return valueSum / realVisitsSum;
}
double Node::get_value_sum() const
{
return valueSum;
}
uint32_t Node::get_real_visits() const
{
return realVisitsSum;
}
Key Node::hash_key() const
{
return key;
}
size_t Node::get_number_child_nodes() const
{
return legalActions.size();
}
void Node::prepare_node_for_visits()
{
sort_moves_by_probabilities();
if (d == nullptr) { // mark_tablebase() initializes the NodeData
init_node_data();
}
#ifdef MCTS_STORE_STATES
state->prepare_action();
#endif
}
uint32_t Node::get_visits() const
{
return d->visitSum;
}
uint32_t Node::get_real_visits(ChildIdx childIdx) const
{
return d->childNumberVisits[childIdx] - d->virtualLossCounter[childIdx];
}
void backup_collision(const SearchSettings* searchSettings, const Trajectory& trajectory) {
for (auto it = trajectory.rbegin(); it != trajectory.rend(); ++it) {
it->node->revert_virtual_loss(it->childIdx, searchSettings);
}
}
void Node::revert_virtual_loss(ChildIdx childIdx, const SearchSettings* searchSettings)
{
lock();
switch (get_virtual_style(searchSettings, d->childNumberVisits[childIdx])) {
case VIRTUAL_LOSS:
d->qValues[childIdx] = (double(d->qValues[childIdx]) * d->childNumberVisits[childIdx] + 1) / (d->childNumberVisits[childIdx] - 1);
break;
case VIRTUAL_OFFSET:
d->qValues[childIdx] += searchSettings->virtualOffsetStrenght;
case VIRTUAL_MIX: ; // ignore
case VIRTUAL_VISIT: ; // ignore
}
--d->childNumberVisits[childIdx];
--d->visitSum;
// decrement virtual loss counter
update_virtual_loss_counter<false>(childIdx);
unlock();
}
bool Node::is_playout_node() const
{
return d != nullptr;
}
bool Node::is_blank_root_node() const
{
return get_visits() == 0;
}
bool Node::is_solved() const
{
return d->nodeType != UNSOLVED;
}
bool Node::has_forced_win() const
{
return get_checkmate_idx() != NO_CHECKMATE;
}
uint16_t Node::get_no_visit_idx() const
{
return d->noVisitIdx;
}
bool Node::is_fully_expanded() const
{
return get_number_child_nodes() == d->noVisitIdx;
}
DynamicVector<float>& Node::get_policy_prob_small()
{
return policyProbSmall;
}
void Node::set_value(float value)
{
++this->realVisitsSum;
this->valueSum = value * this->realVisitsSum;
}
Node* Node::add_new_node_to_tree(MapWithMutex* mapWithMutex, StateObj* newState, ChildIdx childIdx, const SearchSettings* searchSettings, bool& transposition)
{
if(searchSettings->useMCGS) {
mapWithMutex->mtx.lock();
HashMap::const_iterator it = mapWithMutex->hashTable.find(newState->hash_key());
if (it != mapWithMutex->hashTable.end()) {
shared_ptr<Node> transpositionNode = it->second.lock();
Node* tranpositionNode = get_child_node(childIdx);
if (tranpositionNode != nullptr) {
if(is_transposition_verified(tranpositionNode, newState)) {
d->childNodes[childIdx] = atomic_load(&transpositionNode);
mapWithMutex->mtx.unlock();
tranpositionNode->lock();
tranpositionNode->add_transposition_parent_node();
tranpositionNode->unlock();
switch (searchSettings->searchPlayerMode) {
case MODE_TWO_PLAYER:
if (tranpositionNode->is_playout_node() && tranpositionNode->get_node_type() == LOSS) {
set_checkmate_idx(childIdx);
}
case MODE_SINGLE_PLAYER: ;
}
transposition = true;
return tranpositionNode;
}
}
}
mapWithMutex->mtx.unlock();
}
// connect the Node to the parent
shared_ptr<Node> newNode = make_shared<Node>(newState, searchSettings);
atomic_store(&d->childNodes[childIdx], newNode);
if (searchSettings->useMCGS) {
mapWithMutex->mtx.lock();
mapWithMutex->hashTable.insert({d->childNodes[childIdx]->hash_key(), d->childNodes[childIdx]});
mapWithMutex->mtx.unlock();
}
transposition = false;
return d->childNodes[childIdx].get();
}
void Node::add_transposition_parent_node()
{
++numberParentNodes;
}
float Node::max_policy_prob()
{
return max(policyProbSmall);
}
ChildIdx Node::max_q_child() const
{
return argmax(d->qValues);
}
ChildIdx Node::max_visits_child() const
{
return argmax(d->childNumberVisits);
}
float Node::updated_value_eval() const
{
if (!is_sorted()) {
return get_value();
}
if (d == nullptr || get_visits() == 1) {
return get_value();
}
switch(d->nodeType) {
case WIN:
return WIN_VALUE;
case DRAW:
return DRAW_VALUE;
case LOSS:
return LOSS_VALUE;
#ifdef MCTS_TB_SUPPORT
case TB_WIN:
return WIN_VALUE;
case TB_DRAW:
return DRAW_VALUE;
case TB_LOSS:
return LOSS_VALUE;
#endif
default: ; // UNSOLVED
}
return d->qValues[argmax(d->childNumberVisits)];
}
std::vector<Action> Node::get_legal_actions() const
{
return legalActions;
}
int Node::get_checkmate_idx() const
{
return d->checkmateIdx;
}
DynamicVector<uint32_t> Node::get_child_number_visits() const
{
return d->childNumberVisits;
}
uint32_t Node::get_child_number_visits(ChildIdx childIdx) const
{
return d->childNumberVisits[childIdx];
}
void Node::enable_has_nn_results()
{
hasNNResults = true;
}
uint16_t Node::plies_from_null() const
{
return pliesFromNull;
}
bool Node::is_tablebase() const
{
return isTablebase;
}
NodeType Node::get_node_type() const
{
return d->nodeType;
}
uint16_t Node::get_end_in_ply() const
{
return d->endInPly;
}
uint32_t Node::get_free_visits() const
{
return d->freeVisits;
}
void Node::init_node_data(size_t numberNodes)
{
d = make_unique<NodeData>(numberNodes);
}
void Node::init_node_data()
{
init_node_data(get_number_child_nodes());
}
void Node::mark_as_terminal()
{
isTerminal = true;
d = make_unique<NodeData>();
sorted = true;
d->noVisitIdx = 0;
}
void Node::check_for_terminal(StateObj* pos)
{
float customValue;
TerminalType terminalType = pos->is_terminal(get_number_child_nodes(), customValue);
if (terminalType != TERMINAL_NONE) {
mark_as_terminal();
switch(terminalType) {
case TERMINAL_WIN:
mark_as_win();
break;
case TERMINAL_DRAW:
mark_as_draw();
legalActions.clear(); // in case of non stale-mate, legal actions could have moves
break;
case TERMINAL_LOSS:
mark_as_loss();
break;
case TERMINAL_CUSTOM:
set_value(customValue);
case TERMINAL_NONE:
; // pass
}
}
}
#ifdef MCTS_TB_SUPPORT
void Node::check_for_tablebase_wdl(StateObj* state)
{
Tablebase::ProbeState result;
Tablebase::WDLScore wdlScore = state->check_for_tablebase_wdl(result);
if (result != Tablebase::FAIL) {
mark_as_tablebase();
switch(wdlScore) {
case Tablebase::WDLLoss:
mark_as_tb_loss();
break;
case Tablebase::WDLWin:
mark_as_tb_win();
break;
default:
mark_as_tb_draw();
}
}
// default: isTablebase = false;
}
void Node::mark_as_tablebase()
{
init_node_data();
isTablebase = true;
}
#endif
void Node::make_to_root()
{
numberParentNodes = 0;
}
void Node::lock()
{
mtx.lock();
}
void Node::unlock()
{
mtx.unlock();
}
void Node::apply_dirichlet_noise_to_prior_policy(const SearchSettings* searchSettings)
{
DynamicVector<float> dirichlet_noise = get_dirichlet_noise(get_number_child_nodes(), searchSettings->dirichletAlpha);
policyProbSmall = (1 - searchSettings->dirichletEpsilon ) * policyProbSmall + searchSettings->dirichletEpsilon * dirichlet_noise;
}
void Node::apply_temperature_to_prior_policy(float temperature)
{
apply_temperature(policyProbSmall, temperature);
}
void Node::set_probabilities_for_moves(const float *data, bool mirrorPolicy)
{
// allocate sufficient memory -> is assumed that it has already been done
assert(legalActions.size() == policyProbSmall.size());
for (size_t mvIdx = 0; mvIdx < legalActions.size(); ++mvIdx) {
// retrieve vector index from look-up table
// set the right prob value
// accessing the data on the raw floating point vector is faster
// than calling policyProb.At(batchIdx, vectorIdx)
if (mirrorPolicy) {
// use mirrored action_to_index
policyProbSmall[mvIdx] = data[StateConstants::action_to_index<normal,mirrored>(legalActions[mvIdx])];
}
else {
// use non-mirrored action_to_index
policyProbSmall[mvIdx] = data[StateConstants::action_to_index<normal,notMirrored>(legalActions[mvIdx])];
}
}
}
void Node::apply_softmax_to_policy()
{
policyProbSmall = softmax(policyProbSmall);
}
//void Node::mark_enhanced_moves(const Board* pos, const SearchSettings* searchSettings)
//{
// // const float numberChildNodes = get_number_child_nodes();
// // if (searchSettings->enhanceChecks || searchSettings->enhanceCaptures) {
// // isCheck.resize(numberChildNodes);
// // isCheck = false;
// // isCapture.resize(numberChildNodes);
// // isCapture = false;
// // for (size_t idx = 0; idx < numberChildNodes; ++idx) {
// // if (pos->capture(legalMoves[idx])) {
// // isCapture[idx] = true;
// // }
// // if (pos->gives_check(legalMoves[idx])) {
// // isCheck[idx] = true;