c++五子棋神经网络算法代码

以下是使用C++实现的五子棋神经网络算法代码，仅供参考：

#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <cmath>

using namespace std;

const int BOARD_SIZE = 15;
const int INPUT_SIZE = BOARD_SIZE * BOARD_SIZE;
const int HIDDEN_LAYER_SIZE = 200;
const int OUTPUT_SIZE = BOARD_SIZE * BOARD_SIZE;

const double LEARNING_RATE = 0.1;
const double MOMENTUM = 0.9;

class NeuralNetwork {
private:
    vector<double> inputNodes;
    vector<double> hiddenNodes;
    vector<double> outputNodes;

    vector<double> hiddenBiases;
    vector<double> outputBiases;

    vector<vector<double>> hiddenWeights;
    vector<vector<double>> outputWeights;

    vector<double> hiddenErrorGradients;
    vector<double> outputErrorGradients;

    vector<vector<double>> hiddenWeightDelta;
    vector<vector<double>> outputWeightDelta;

public:
    NeuralNetwork() {
        inputNodes.resize(INPUT_SIZE);
        hiddenNodes.resize(HIDDEN_LAYER_SIZE);
        outputNodes.resize(OUTPUT_SIZE);

        hiddenBiases.resize(HIDDEN_LAYER_SIZE);
        outputBiases.resize(OUTPUT_SIZE);

        hiddenWeights.resize(HIDDEN_LAYER_SIZE, vector<double>(INPUT_SIZE));
        outputWeights.resize(OUTPUT_SIZE, vector<double>(HIDDEN_LAYER_SIZE));

        hiddenErrorGradients.resize(HIDDEN_LAYER_SIZE);
        outputErrorGradients.resize(OUTPUT_SIZE);

        hiddenWeightDelta.resize(HIDDEN_LAYER_SIZE, vector<double>(INPUT_SIZE));
        outputWeightDelta.resize(OUTPUT_SIZE, vector<double>(HIDDEN_LAYER_SIZE));

        srand(time(NULL));

        for (int i = 0; i < HIDDEN_LAYER_SIZE; i++) {
            hiddenBiases[i] = ((double) rand() / RAND_MAX) * 2 - 1;
            for (int j = 0; j < INPUT_SIZE; j++) {
                hiddenWeights[i][j] = ((double) rand() / RAND_MAX) * 2 - 1;
            }
        }

        for (int i = 0; i < OUTPUT_SIZE; i++) {
            outputBiases[i] = ((double) rand() / RAND_MAX) * 2 - 1;
            for (int j = 0; j < HIDDEN_LAYER_SIZE; j++) {
                outputWeights[i][j] = ((double) rand() / RAND_MAX) * 2 - 1;
            }
        }
    }

    void setInputNodes(vector<vector<int>>& board) {
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                inputNodes[i * BOARD_SIZE + j] = board[i][j];
            }
        }
    }

    void feedForward() {
        for (int i = 0; i < HIDDEN_LAYER_SIZE; i++) {
            double sum = 0.0;
            for (int j = 0; j < INPUT_SIZE; j++) {
                sum += inputNodes[j] * hiddenWeights[i][j];
            }
            sum += hiddenBiases[i];
            hiddenNodes[i] = 1.0 / (1.0 + exp(-sum));
        }

        for (int i = 0; i < OUTPUT_SIZE; i++) {
            double sum = 0.0;
            for (int j = 0; j < HIDDEN_LAYER_SIZE; j++) {
                sum += hiddenNodes[j] * outputWeights[i][j];
            }
            sum += outputBiases[i];
            outputNodes[i] = 1.0 / (1.0 + exp(-sum));
        }
    }

    void backPropagate(vector<int>& target) {
        for (int i = 0; i < OUTPUT_SIZE; i++) {
            outputErrorGradients[i] = outputNodes[i] * (1 - outputNodes[i]) * (target[i] - outputNodes[i]);
            for (int j = 0; j < HIDDEN_LAYER_SIZE; j++) {
                outputWeightDelta[i][j] = LEARNING_RATE * outputErrorGradients[i] * hiddenNodes[j] + MOMENTUM * outputWeightDelta[i][j];
                outputWeights[i][j] += outputWeightDelta[i][j];
            }
            outputBiases[i] += LEARNING_RATE * outputErrorGradients[i];
        }

        for (int i = 0; i < HIDDEN_LAYER_SIZE; i++) {
            double sum = 0.0;
            for (int j = 0; j < OUTPUT_SIZE; j++) {
                sum += outputErrorGradients[j] * outputWeights[j][i];
            }
            hiddenErrorGradients[i] = hiddenNodes[i] * (1 - hiddenNodes[i]) * sum;
            for (int j = 0; j < INPUT_SIZE; j++) {
                hiddenWeightDelta[i][j] = LEARNING_RATE * hiddenErrorGradients[i] * inputNodes[j] + MOMENTUM * hiddenWeightDelta[i][j];
                hiddenWeights[i][j] += hiddenWeightDelta[i][j];
            }
            hiddenBiases[i] += LEARNING_RATE * hiddenErrorGradients[i];
        }
    }

    vector<int> getOutputNodes() {
        vector<int> result(OUTPUT_SIZE);
        for (int i = 0; i < OUTPUT_SIZE; i++) {
            result[i] = round(outputNodes[i]);
        }
        return result;
    }
};

class Game {
private:
    vector<vector<int>> board;
    int currentPlayer;
    int winner;
    bool gameOver;
    NeuralNetwork neuralNetwork;

public:
    Game() {
        board.resize(BOARD_SIZE, vector<int>(BOARD_SIZE));
        currentPlayer = 1;
        winner = 0;
        gameOver = false;
    }

    void play() {
        while (!gameOver) {
            printBoard();
            if (currentPlayer == 1) {
                playerMove();
            } else {
                computerMove();
            }
            updateGameState();
        }
        printBoard();
        printResult();
    }

private:
    void printBoard() {
        cout << "   ";
        for (int i = 0; i < BOARD_SIZE; i++) {
            cout << i << " ";
        }
        cout << endl;
        for (int i = 0; i < BOARD_SIZE; i++) {
            cout << i << "  ";
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == 0) {
                    cout << ". ";
                } else if (board[i][j] == 1) {
                    cout << "X ";
                } else {
                    cout << "O ";
                }
            }
            cout << endl;
        }
    }

    void playerMove() {
        int x, y;
        cout << "Enter your move (row column): ";
        cin >> x >> y;
        board[x][y] = currentPlayer;
    }

    void computerMove() {
        vector<int> input(BOARD_SIZE * BOARD_SIZE);
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                input[i * BOARD_SIZE + j] = board[i][j];
            }
        }
        neuralNetwork.setInputNodes(board);
        neuralNetwork.feedForward();
        vector<int> output = neuralNetwork.getOutputNodes();
        int maxIndex = 0;
        for (int i = 0; i < BOARD_SIZE * BOARD_SIZE; i++) {
            if (output[i] > output[maxIndex]) {
                maxIndex = i;
            }
        }
        int x = maxIndex / BOARD_SIZE;
        int y = maxIndex % BOARD_SIZE;
        board[x][y] = currentPlayer;
    }

    void updateGameState() {
        int winner = checkWinner();
        if (winner != 0) {
            gameOver = true;
            this->winner = winner;
        } else {
            currentPlayer = (currentPlayer == 1 ? 2 : 1);
        }
    }

    int checkWinner() {
        // Check rows
        for (int i = 0; i < BOARD_SIZE; i++) {
            int count = 0;
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == currentPlayer) {
                    count++;
                } else {
                    count = 0;
                }
                if (count == 5) {
                    return currentPlayer;
                }
            }
        }

        // Check columns
        for (int j = 0; j < BOARD_SIZE; j++) {
            int count = 0;
            for (int i = 0; i < BOARD_SIZE; i++) {
                if (board[i][j] == currentPlayer) {
                    count++;
                } else {
                    count = 0;
                }
                if (count == 5) {
                    return currentPlayer;
                }
            }
        }

        // Check diagonals
        for (int i = 0; i < BOARD_SIZE - 4; i++) {
            for (int j = 0; j < BOARD_SIZE - 4; j++) {
                if (board[i][j] == currentPlayer &&
                    board[i + 1][j + 1] == currentPlayer &&
                    board[i + 2][j + 2] == currentPlayer &&
                    board[i + 3][j + 3] == currentPlayer &&
                    board[i + 4][j + 4] == currentPlayer) {
                    return currentPlayer;
                }
            }
        }

        // Check anti-diagonals
        for (int i = 4; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE - 4; j++) {
                if (board[i][j] == currentPlayer &&
                    board[i - 1][j + 1] == currentPlayer &&
                    board[i - 2][j + 2] == currentPlayer &&
                    board[i - 3][j + 3] == currentPlayer &&
                    board[i - 4][j + 4] == currentPlayer) {
                    return currentPlayer;
                }
            }
        }

        // Check for tie
        int count = 0;
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] != 0) {
                    count++;
                }
            }
        }
        if (count == BOARD_SIZE * BOARD_SIZE) {
            gameOver = true;
            return -1;
        }

        return 0;
    }

    void printResult() {
        if (winner == -1) {
            cout << "Tie!" << endl;
        } else if (winner == 1) {
            cout << "You win!" << endl;
        } else {
            cout << "Computer wins!" << endl;
        }
    }
};

int main() {
    Game game;
    game.play();
    return 0;
}

该代码实现了一个简单的五子棋游戏，并使用神经网络算法实现了计算机的下棋。其中，神经网络包含一个输入层、一个隐藏层和一个输出层，每个节点采用sigmoid函数作为激活函数。神经网络的训练采用反向传播算法。