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50_table.js
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50_table.js
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"use strict";
// The table object stores info from the engine about a game-tree (PGN) node.
function NewTable() {
let table = Object.create(table_prototype);
table.clear();
return table;
}
const table_prototype = {
clear: function() {
this.moveinfo = Object.create(null); // move --> info
this.version = 0; // Incremented on any change
this.nodes = 0; // Stat sent by engine
this.nps = 0; // Stat sent by engine
this.tbhits = 0; // Stat sent by engine
this.time = 0; // Stat sent by engine
this.limit = null; // The limit of the last search that updated this.
this.terminal = null; // null = unknown, "" = not terminal, "Non-empty string" = terminal reason
this.graph_y = null; // Used by grapher only, value from White's POV between 0 and 1
this.graph_y_version = 0; // Which version (above) was used to generate the graph_y value
this.already_autopopulated = false;
},
get_graph_y: function() {
// Naphthalin's scheme: based on centipawns.
if (this.graph_y_version === this.version) {
return this.graph_y;
} else {
let info = SortedMoveInfoFromTable(this)[0];
if (info && !info.__ghost && info.__touched && (this.nodes > 1 || this.limit === 1)) {
let cp = info.cp;
if (info.board.active === "b") {
cp *= -1;
}
this.graph_y = 1 / (1 + Math.pow(0.5, cp / 100));
} else {
this.graph_y = null;
}
this.graph_y_version = this.version;
return this.graph_y;
}
},
set_terminal_info: function(reason, ev) { // ev is ignored if reason is "" (i.e. not a terminal position)
if (reason) {
this.terminal = reason;
this.graph_y = ev;
this.graph_y_version = this.version;
} else {
this.terminal = "";
}
},
autopopulate: function(node) {
if (!node) {
throw "autopopulate() requires node argument";
}
if (this.already_autopopulated) {
return;
}
if (node.destroyed) {
return;
}
let moves = node.board.movegen();
for (let move of moves) {
if (node.table.moveinfo[move] === undefined) {
node.table.moveinfo[move] = NewInfo(node.board, move);
}
}
this.already_autopopulated = true;
}
};
// --------------------------------------------------------------------------------------------
// The info object stores info received from the engine about a move. The actual updating of
// the object takes place in info.js and the ih.receive() method there.
function NewInfo(board, move) {
let info = Object.create(info_prototype);
info.board = board;
info.move = move;
info.__ghost = false; // If not false, this is temporary inferred info.
info.__touched = false; // Has this ever actually been updated?
info.leelaish = false; // Whether the most recent update to this info was from an engine considered Leelaish.
info.pv = [move]; // Validated as a legal sequence upon reception.
info.cycle = 0; // How many "go" commands Nibbler has emitted.
info.subcycle = 0; // How many "blocks" of info we have seen (delineated by multipv 1 info).
info.nice_pv_cache = [board.nice_string(move)];
info.clear_stats();
return info;
}
const info_prototype = {
// I'm not sure I've been conscientious everywhere in the code about checking whether these things are
// of the right type, so for that reason most are set to some neutralish value by default.
//
// Exceptions: m, v, wdl (and note that all of these can be set to null by info.js)
clear_stats: function() {
this.cp = 0;
this.depth = 0;
this.m = null;
this.mate = 0; // 0 can be the "not present" value.
this.multipv = 1;
this.n = 0;
this.p = 0; // Note P is received and stored as a percent, e.g. 31.76 is a reasonable P.
this.q = 0;
this.s = 1; // Known as Q+U before Lc0 v0.25-rc2
this.seldepth = 0;
this.u = 1;
this.uci_nodes = 0; // The number of nodes reported by the UCI info lines (i.e. for the whole position).
this.v = null;
this.vms_order = 0; // VerboseMoveStats order, 0 means not present, 1 is the worst, higher is better.
this.wdl = null; // Either null or a length 3 array of ints.
},
set_pv: function(pv) {
this.pv = Array.from(pv);
this.nice_pv_cache = null;
},
nice_pv: function() {
// Human readable moves.
if (this.nice_pv_cache) {
return Array.from(this.nice_pv_cache);
}
let tmp_board = this.board;
if (!this.pv || this.pv.length === 0) { // Should be impossible.
this.pv = [this.move];
}
let ret = [];
for (let move of this.pv) {
// if (tmp_board.illegal(move)) break; // Should be impossible as of 1.8.4: PVs are validated upon reception, and the only other
// way they can get changed is by maybe_infer_info(), which hopefully is sound.
ret.push(tmp_board.nice_string(move));
tmp_board = tmp_board.move(move);
}
this.nice_pv_cache = ret;
return Array.from(this.nice_pv_cache);
},
value: function() {
return Value(this.q); // Rescaled to 0..1
},
value_string: function(dp, pov) {
if (!this.__touched || typeof this.q !== "number") {
return "?";
}
if (this.leelaish && this.n === 0) {
return "?";
}
let val = this.value();
if ((pov === "w" && this.board.active === "b") || (pov === "b" && this.board.active === "w")) {
val = 1 - val;
}
return (val * 100).toFixed(dp);
},
cp_string: function(pov) {
if (!this.__touched || typeof this.cp !== "number") {
return "?";
}
if (this.leelaish && this.n === 0) {
return "?";
}
let cp = this.cp;
if ((pov === "w" && this.board.active === "b") || (pov === "b" && this.board.active === "w")) {
cp = 0 - cp;
}
let ret = (cp / 100).toFixed(2);
if (cp > 0) {
ret = "+" + ret;
}
return ret;
},
mate_string: function(pov) {
if (typeof this.mate !== "number" || this.mate === 0) {
return "?";
}
let mate = this.mate;
if ((pov === "w" && this.board.active === "b") || (pov === "b" && this.board.active === "w")) {
mate = 0 - mate;
}
if (mate < 0) {
return `(-M${0 - mate})`;
} else {
return `(+M${mate})`;
}
},
wdl_string: function(pov) {
if (Array.isArray(this.wdl) === false || this.wdl.length !== 3) {
return "?";
}
if ((pov === "w" && this.board.active === "b") || (pov === "b" && this.board.active === "w")) {
return `${this.wdl[2]} ${this.wdl[1]} ${this.wdl[0]}`;
} else {
return `${this.wdl[0]} ${this.wdl[1]} ${this.wdl[2]}`;
}
},
stats_list: function(opts, total_nodes) { // We pass total_nodes rather than use this.uci_nodes which can be obsolete (e.g. due to searchmoves)
if (this.__ghost) {
return ["Inferred"];
}
let ret = [];
if (opts.ev) {
ret.push(`EV: ${this.value_string(1, opts.ev_pov)}%`);
}
if (opts.cp) {
ret.push(`CP: ${this.cp_string(opts.cp_pov)}`);
}
// N is fairly complicated...
if (this.leelaish) {
if (typeof this.n === "number" && total_nodes) { // i.e. total_nodes is not zero or undefined
let n_string = "";
if (opts.n) {
n_string += ` N: ${(100 * this.n / total_nodes).toFixed(2)}%`;
}
if (opts.n_abs) {
if (opts.n) {
n_string += ` [${NString(this.n)}]`;
} else {
n_string += ` N: ${NString(this.n)}`;
}
}
if (opts.of_n) {
n_string += ` of ${NString(total_nodes)}`;
}
if (n_string !== "") {
ret.push(n_string.trim());
}
} else {
if (opts.n || opts.n_abs || opts.of_n) {
ret.push("N: ?");
}
}
}
// Everything else...
if (!this.leelaish) {
if (opts.depth) {
if (typeof this.depth === "number" && this.depth > 0) {
ret.push(`Depth: ${this.depth}`);
} else {
ret.push(`Depth: 0`);
}
}
}
if (this.leelaish) {
if (opts.p) {
if (typeof this.p === "number" && this.p > 0) {
ret.push(`P: ${this.p}%`);
} else {
ret.push(`P: ?`);
}
}
if (opts.v) {
if (typeof this.v === "number") {
ret.push(`V: ${this.v.toFixed(3)}`);
} else {
ret.push(`V: ?`);
}
}
}
if (opts.q) {
if (typeof this.q === "number") {
ret.push(`Q: ${this.q.toFixed(3)}`);
} else {
ret.push(`Q: ?`);
}
}
if (this.leelaish) {
if (opts.u) {
if (typeof this.u === "number" && this.n > 0) { // Checking n is correct.
ret.push(`U: ${this.u.toFixed(3)}`);
} else {
ret.push(`U: ?`);
}
}
if (opts.s) {
if (typeof this.s === "number" && this.n > 0) { // Checking n is correct.
ret.push(`S: ${this.s.toFixed(5)}`);
} else {
ret.push(`S: ?`);
}
}
if (opts.m) {
if (typeof this.m === "number") {
if (this.m > 0) {
ret.push(`M: ${this.m.toFixed(1)}`);
} else {
ret.push(`M: 0`);
}
} else {
ret.push(`M: ?`);
}
}
}
if (opts.wdl) {
ret.push(`WDL: ${this.wdl_string(opts.wdl_pov)}`);
}
return ret;
}
};