整合到你的專案

本文介紹如何將 KataGo 整合到你的應用程式中。

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整合方式選擇

方式	適用場景	複雜度
Analysis Engine	批次分析、API 服務	低
GTP 模式	即時對弈、互動式	中
直接呼叫函式庫	深度整合、自訂功能	高

本文聚焦於 Analysis Engine，這是最適合程式整合的方式。

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Python 整合

基本架構

import subprocess
import json

class KataGoEngine:
    def __init__(self, katago_path, model_path, config_path=None):
        cmd = [katago_path, "analysis", "-model", model_path]
        if config_path:
            cmd.extend(["-config", config_path])

        self.process = subprocess.Popen(
            cmd,
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
            bufsize=1
        )

    def analyze(self, query):
        """送出分析請求並取得回應"""
        query_str = json.dumps(query) + "\n"
        self.process.stdin.write(query_str)
        self.process.stdin.flush()

        response_line = self.process.stdout.readline()
        return json.loads(response_line)

    def close(self):
        self.process.terminate()
        self.process.wait()

完整範例：分析一盤棋

import json

# 初始化引擎
engine = KataGoEngine(
    katago_path="/usr/local/bin/katago",
    model_path="./kata-b18c384.bin.gz"
)

# 準備分析請求
query = {
    "id": "game1",
    "moves": [
        ["B", "Q16"],
        ["W", "D4"],
        ["B", "Q4"],
        ["W", "D16"]
    ],
    "rules": "chinese",
    "komi": 7.5,
    "boardXSize": 19,
    "boardYSize": 19,
    "analyzeTurns": [0, 1, 2, 3, 4],  # 分析每一手
    "maxVisits": 500
}

# 執行分析
result = engine.analyze(query)

# 處理結果
print(f"查詢 ID: {result['id']}")
print(f"分析手數: {result['turnNumber']}")
print(f"當前勝率: {result['rootInfo']['winrate']:.1%}")
print(f"預期領先: {result['rootInfo']['scoreLead']:.1f} 目")

print("\n候選下法：")
for move_info in result['moveInfos'][:5]:
    print(f"  {move_info['move']}: "
          f"勝率 {move_info['winrate']:.1%}, "
          f"訪問 {move_info['visits']}, "
          f"變化 {' '.join(move_info['pv'][:3])}")

engine.close()

批次分析多盤棋

def analyze_game(engine, moves, game_id="game"):
    """分析一盤棋的所有手數"""
    results = []

    for turn in range(len(moves) + 1):
        query = {
            "id": f"{game_id}_turn{turn}",
            "moves": moves[:turn],
            "rules": "chinese",
            "komi": 7.5,
            "boardXSize": 19,
            "boardYSize": 19,
            "analyzeTurns": [turn],
            "maxVisits": 200
        }

        result = engine.analyze(query)
        results.append({
            "turn": turn,
            "winrate": result["rootInfo"]["winrate"],
            "scoreLead": result["rootInfo"]["scoreLead"],
            "bestMove": result["moveInfos"][0]["move"] if result["moveInfos"] else None
        })

    return results

# 使用範例
moves = [["B", "Q16"], ["W", "D4"], ["B", "Q4"], ["W", "D16"]]
analysis = analyze_game(engine, moves)

for turn_data in analysis:
    print(f"手 {turn_data['turn']}: "
          f"勝率 {turn_data['winrate']:.1%}, "
          f"最佳 {turn_data['bestMove']}")

取得領地預測

query = {
    "id": "ownership_query",
    "moves": [["B", "Q16"], ["W", "D4"]],
    "rules": "chinese",
    "komi": 7.5,
    "boardXSize": 19,
    "boardYSize": 19,
    "analyzeTurns": [2],
    "includeOwnership": True,  # 關鍵參數
    "maxVisits": 500
}

result = engine.analyze(query)

# ownership 是一個 361 元素的陣列
# 值在 -1（白方領地）到 +1（黑方領地）之間
ownership = result.get("ownership", [])

# 轉換為 19x19 棋盤
def ownership_to_board(ownership, size=19):
    board = []
    for row in range(size):
        board.append(ownership[row * size:(row + 1) * size])
    return board

board = ownership_to_board(ownership)

# 視覺化
for row in board:
    line = ""
    for val in row:
        if val > 0.5:
            line += "●"  # 黑方領地
        elif val < -0.5:
            line += "○"  # 白方領地
        else:
            line += "·"  # 中立
    print(line)

---

Node.js 整合

基本架構

const { spawn } = require('child_process');
const readline = require('readline');

class KataGoEngine {
    constructor(katagoPath, modelPath, configPath = null) {
        const args = ['analysis', '-model', modelPath];
        if (configPath) {
            args.push('-config', configPath);
        }

        this.process = spawn(katagoPath, args);
        this.pendingQueries = new Map();

        const rl = readline.createInterface({
            input: this.process.stdout,
            crlfDelay: Infinity
        });

        rl.on('line', (line) => {
            try {
                const result = JSON.parse(line);
                const resolver = this.pendingQueries.get(result.id);
                if (resolver) {
                    resolver(result);
                    this.pendingQueries.delete(result.id);
                }
            } catch (e) {
                console.error('Parse error:', e);
            }
        });
    }

    analyze(query) {
        return new Promise((resolve) => {
            this.pendingQueries.set(query.id, resolve);
            this.process.stdin.write(JSON.stringify(query) + '\n');
        });
    }

    close() {
        this.process.kill();
    }
}

module.exports = KataGoEngine;

完整範例

const KataGoEngine = require('./katago-engine');

async function main() {
    const engine = new KataGoEngine(
        '/usr/local/bin/katago',
        './kata-b18c384.bin.gz'
    );

    // 等待引擎啟動
    await new Promise(resolve => setTimeout(resolve, 2000));

    const query = {
        id: 'test1',
        moves: [['B', 'Q16'], ['W', 'D4'], ['B', 'Q4']],
        rules: 'chinese',
        komi: 7.5,
        boardXSize: 19,
        boardYSize: 19,
        analyzeTurns: [3],
        maxVisits: 500
    };

    const result = await engine.analyze(query);

    console.log(`勝率: ${(result.rootInfo.winrate * 100).toFixed(1)}%`);
    console.log(`領先: ${result.rootInfo.scoreLead.toFixed(1)} 目`);

    console.log('\n候選下法:');
    result.moveInfos.slice(0, 5).forEach((info, i) => {
        console.log(`  ${i + 1}. ${info.move}: ${(info.winrate * 100).toFixed(1)}%`);
    });

    engine.close();
}

main().catch(console.error);

Express API 服務

const express = require('express');
const KataGoEngine = require('./katago-engine');

const app = express();
app.use(express.json());

const engine = new KataGoEngine(
    '/usr/local/bin/katago',
    './kata-b18c384.bin.gz'
);

let queryCounter = 0;

app.post('/analyze', async (req, res) => {
    try {
        const { moves, rules = 'chinese', komi = 7.5 } = req.body;

        const query = {
            id: `query_${++queryCounter}`,
            moves: moves,
            rules: rules,
            komi: komi,
            boardXSize: 19,
            boardYSize: 19,
            analyzeTurns: [moves.length],
            maxVisits: 500
        };

        const result = await engine.analyze(query);

        res.json({
            winrate: result.rootInfo.winrate,
            scoreLead: result.rootInfo.scoreLead,
            bestMoves: result.moveInfos.slice(0, 5).map(info => ({
                move: info.move,
                winrate: info.winrate,
                visits: info.visits
            }))
        });
    } catch (error) {
        res.status(500).json({ error: error.message });
    }
});

app.listen(3000, () => {
    console.log('KataGo API 服務啟動於 http://localhost:3000');
});

使用 API

curl -X POST http://localhost:3000/analyze \
  -H "Content-Type: application/json" \
  -d '{"moves": [["B","Q16"],["W","D4"],["B","Q4"]]}'

---

座標轉換工具

Python

def coord_to_gtp(x, y, board_size=19):
    """將 (x, y) 座標轉換為 GTP 格式（如 Q16）"""
    letters = 'ABCDEFGHJKLMNOPQRST'
    return f"{letters[x]}{board_size - y}"

def gtp_to_coord(gtp_coord, board_size=19):
    """將 GTP 格式轉換為 (x, y) 座標"""
    letters = 'ABCDEFGHJKLMNOPQRST'
    x = letters.index(gtp_coord[0].upper())
    y = board_size - int(gtp_coord[1:])
    return (x, y)

def sgf_to_gtp(sgf_coord, board_size=19):
    """將 SGF 格式（如 'pd'）轉換為 GTP 格式（如 'Q16'）"""
    if not sgf_coord or sgf_coord == '':
        return 'pass'
    x = ord(sgf_coord[0]) - ord('a')
    y = ord(sgf_coord[1]) - ord('a')
    return coord_to_gtp(x, y, board_size)

# 使用範例
print(coord_to_gtp(15, 3))    # Q16
print(gtp_to_coord("Q16"))    # (15, 3)
print(sgf_to_gtp("pd"))       # Q16

JavaScript

function coordToGtp(x, y, boardSize = 19) {
    const letters = 'ABCDEFGHJKLMNOPQRST';
    return `${letters[x]}${boardSize - y}`;
}

function gtpToCoord(gtpCoord, boardSize = 19) {
    const letters = 'ABCDEFGHJKLMNOPQRST';
    const x = letters.indexOf(gtpCoord[0].toUpperCase());
    const y = boardSize - parseInt(gtpCoord.slice(1));
    return { x, y };
}

function sgfToGtp(sgfCoord, boardSize = 19) {
    if (!sgfCoord || sgfCoord === '') return 'pass';
    const x = sgfCoord.charCodeAt(0) - 'a'.charCodeAt(0);
    const y = sgfCoord.charCodeAt(1) - 'a'.charCodeAt(0);
    return coordToGtp(x, y, boardSize);
}

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錯誤處理

常見錯誤

錯誤	原因	解決方案
Could not load model	模型路徑錯誤	使用絕對路徑
No GPU found	GPU 未正確設定	檢查驅動程式或使用 CPU 版本
Out of memory	GPU 記憶體不足	減少 nnMaxBatchSize
Invalid JSON	請求格式錯誤	確認 JSON 格式正確

健壯的錯誤處理

import json
import subprocess
import time

class RobustKataGoEngine:
    def __init__(self, katago_path, model_path, max_retries=3):
        self.katago_path = katago_path
        self.model_path = model_path
        self.max_retries = max_retries
        self.process = None
        self._start_engine()

    def _start_engine(self):
        if self.process:
            self.process.terminate()

        self.process = subprocess.Popen(
            [self.katago_path, "analysis", "-model", self.model_path],
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
            bufsize=1
        )
        time.sleep(2)  # 等待引擎啟動

    def analyze(self, query, timeout=30):
        for attempt in range(self.max_retries):
            try:
                query_str = json.dumps(query) + "\n"
                self.process.stdin.write(query_str)
                self.process.stdin.flush()

                # 設定讀取超時
                import select
                ready, _, _ = select.select(
                    [self.process.stdout], [], [], timeout
                )

                if ready:
                    response_line = self.process.stdout.readline()
                    return json.loads(response_line)
                else:
                    raise TimeoutError("分析超時")

            except Exception as e:
                print(f"嘗試 {attempt + 1} 失敗: {e}")
                if attempt < self.max_retries - 1:
                    self._start_engine()
                else:
                    raise

    def close(self):
        if self.process:
            self.process.terminate()
            self.process.wait()

---

效能優化

批次處理

def batch_analyze(engine, queries):
    """同時送出多個查詢以提升效率"""
    results = {}

    # 送出所有查詢
    for query in queries:
        query_str = json.dumps(query) + "\n"
        engine.process.stdin.write(query_str)
    engine.process.stdin.flush()

    # 收集所有回應
    for _ in queries:
        response_line = engine.process.stdout.readline()
        result = json.loads(response_line)
        results[result['id']] = result

    return results

設定調整

# 高效能設定（適合批次分析）
numSearchThreads = 8
nnMaxBatchSize = 32
maxVisits = 500

# 低延遲設定（適合即時回應）
numSearchThreads = 4
nnMaxBatchSize = 8
maxVisits = 200

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延伸閱讀

• 基本使用 — GTP 與 Analysis Engine 指令
• 一篇文章搞懂圍棋 AI — 了解技術原理
• KataGo 原始碼導讀 — 深入程式碼