simple TicTacToe example

4 年前 · f5bf6e08
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--- a/config/ppo/TicTacToe.yaml
+++ b/config/ppo/TicTacToe.yaml
+behaviors:
+  TicTacToe:
+    trainer_type: ppo
+    hyperparameters:
+      batch_size: 128
+      buffer_size: 2048
+      learning_rate: 0.0003
+      beta: 0.005
+      epsilon: 0.2
+      lambd: 0.95
+      num_epoch: 3
+      learning_rate_schedule: constant
+    network_settings:
+      normalize: false
+      hidden_units: 512
+      num_layers: 2
+      vis_encode_type: simple
+    reward_signals:
+      extrinsic:
+        gamma: 0.99
+        strength: 1.0
+    keep_checkpoints: 5
+    max_steps: 50000
+    time_horizon: 16
+    summary_freq: 1000
+    threaded: false
+    self_play:
+      save_steps: 5000
+      team_change: 20000
+      swap_steps: 200
+      window: 10
+      play_against_latest_model_ratio: 0.5
+      initial_elo: 1200.0
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--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scenes/TicTacToe.unity
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--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scenes/TicTacToe.unity.meta
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--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts.meta
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--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeAgent.cs
+++ b/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeAgent.cs
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+using Unity.MLAgents;
+using Unity.MLAgents.Actuators;
+using Unity.MLAgents.Sensors;
+
+public enum PlayerType
+{
+    PlayerX,
+    PlayerO
+}
+
+public class TicTacToeAgent : Agent
+{
+    public PlayerType playerType;
+
+    private TicTacToeGame m_Game;
+    private System.Random m_Random;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        m_Game = GetComponentInParent<TicTacToeGame>();
+        m_Random = new System.Random(GetInstanceID());
+    }
+
+    public override void CollectObservations(VectorSensor sensor)
+    {
+        var rows = m_Game.Board.GetLength(0);
+        var cols = m_Game.Board.GetLength(1);
+
+        for (int r = 0; r < rows; r++)
+        {
+            for (int c = 0; c < cols; c++)
+            {
+                // One-hot encoding of the board state *depending on the agent's player type*
+                // Set the 0th element if the board is empty
+                // Set the 1st element if the board is my type
+                // Set the 2nd element if the board is my opponent's type
+                BoardStatus boardVal = m_Game.Board[r, c];
+                bool isMine = (boardVal == BoardStatus.FilledX && playerType == PlayerType.PlayerX) ||
+                              (boardVal == BoardStatus.FilledO && playerType == PlayerType.PlayerO);
+                int oneHotIndex = (boardVal == BoardStatus.Empty) ? 0 : (isMine) ? 1 : 2;
+                sensor.AddOneHotObservation(oneHotIndex, 3);
+            }
+        }
+    }
+
+    public override void WriteDiscreteActionMask(IDiscreteActionMask actionMask)
+    {
+        var rows = m_Game.Board.GetLength(0);
+        var cols = m_Game.Board.GetLength(1);
+        int i = 0;
+
+        for (int r = 0; r < rows; r++)
+        {
+            for (int c = 0; c < cols; c++)
+            {
+                BoardStatus boardVal = m_Game.Board[r, c];
+                // Disallow moves on non-empty squares
+                if (boardVal != BoardStatus.Empty)
+                {
+                    actionMask.WriteMask(0, new[] { i });
+                }
+                i++;
+            }
+        }
+    }
+
+    public override void OnActionReceived(ActionBuffers actions)
+    {
+        var rows = m_Game.Board.GetLength(0);
+        var index = actions.DiscreteActions[0];
+        var r = index / rows;
+        var c = index % rows;
+
+        // The trainer can occasionally (about 1 in a million steps) select an invalid move.
+        // So make sure to check the square is empty before setting it.
+        if (m_Game.Board[r, c] == BoardStatus.Empty)
+        {
+            m_Game.Board[r, c] = (playerType == PlayerType.PlayerX)
+                ? BoardStatus.FilledX
+                : BoardStatus.FilledO;
+        }
+    }
+
+    public override void Heuristic(in ActionBuffers actionsOut)
+    {
+        // Pick a random empty square.
+        var validMoves = new List<int>();
+        var rows = m_Game.Board.GetLength(0);
+        var cols = m_Game.Board.GetLength(1);
+        int i = 0;
+
+        for (int r = 0; r < rows; r++)
+        {
+            for (int c = 0; c < cols; c++)
+            {
+                if (m_Game.Board[r, c] == BoardStatus.Empty)
+                {
+                    validMoves.Add(i);
+                }
+
+                i++;
+            }
+        }
+
+        var choice = validMoves[m_Random.Next(validMoves.Count)];
+        var discreteActions = actionsOut.DiscreteActions;
+        discreteActions[0] = choice;
+    }
+}
--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeAgent.cs.meta
+++ b/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeAgent.cs.meta
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--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeGame.cs
+++ b/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeGame.cs
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Unity.MLAgents;
+using UnityEngine;
+
+public enum BoardStatus
+{
+    Empty,
+    FilledX,
+    FilledO
+}
+
+public enum WinState
+{
+    NoWinnerYet,
+    WinnerX,
+    WinnerO,
+    Draw
+}
+
+public class TicTacToeGame : MonoBehaviour
+{
+    public BoardStatus[,] Board = new BoardStatus[3, 3];
+    private PlayerType m_CurrentPlayer = PlayerType.PlayerX;
+    private TicTacToeAgent m_AgentX;
+    private TicTacToeAgent m_AgentO;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        Academy.Instance.AutomaticSteppingEnabled = false;
+        var agents = GetComponentsInChildren<TicTacToeAgent>();
+        foreach (var agent in agents)
+        {
+            if (agent.playerType == PlayerType.PlayerX)
+            {
+                m_AgentX = agent;
+            }
+            else if (agent.playerType == PlayerType.PlayerO)
+            {
+                m_AgentO = agent;
+            }
+            else
+            {
+                throw new UnityAgentsException("Unknown player type.");
+            }
+        }
+
+        Debug.Assert(m_AgentX != null);
+        Debug.Assert(m_AgentO != null);
+    }
+
+    void InitBoard()
+    {
+        var rows = Board.GetLength(0);
+        var cols = Board.GetLength(1);
+
+        for (int r = 0; r < rows; r++)
+        {
+            for (int c = 0; c < cols; c++)
+            {
+                Board[r, c] = BoardStatus.Empty;
+            }
+        }
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        Agent currentAgent = (m_CurrentPlayer == PlayerType.PlayerX) ? m_AgentX : m_AgentO;
+        currentAgent.RequestDecision();
+        Academy.Instance.EnvironmentStep();
+
+        var winState = CheckForWin();
+        if (winState == WinState.NoWinnerYet)
+        {
+            // Swap
+            m_CurrentPlayer = m_CurrentPlayer == PlayerType.PlayerX ? PlayerType.PlayerO : PlayerType.PlayerX;
+        }
+        else
+        {
+            //Debug.Log(this.ToString());
+            float rewardX = 0.0f;
+            float rewardO = 0.0f;
+
+            if (winState == WinState.WinnerX)
+            {
+                rewardX = 1.0f;
+                rewardO = -1.0f;
+                //Debug.Log("X wins!");
+            }
+            else if (winState == WinState.WinnerO)
+            {
+                rewardX = -1.0f;
+                rewardO = 1.0f;
+                //Debug.Log("O wins!");
+            }
+            else
+            {
+                //Debug.Log("Nobody wins :(");
+            }
+            m_AgentX.AddReward(rewardX);
+            m_AgentX.EndEpisode();
+
+            m_AgentO.AddReward(rewardO);
+            m_AgentO.EndEpisode();
+
+            InitBoard();
+        }
+    }
+
+    public WinState CheckForWin()
+    {
+        // Assume 3 rows and columns for now, not interested in generalizing.
+
+        // Check rows
+        for (var r = 0; r < 3; r++)
+        {
+            if (Board[r, 0] == BoardStatus.Empty)
+            {
+                continue;
+            }
+
+            if (Board[r, 1] == Board[r, 0] && Board[r, 2] == Board[r, 0])
+            {
+                // all the same in the row
+                return (Board[r, 0] == BoardStatus.FilledX) ? WinState.WinnerX : WinState.WinnerO;
+            }
+        }
+
+        for (var c = 0; c < 3; c++)
+        {
+            if (Board[0, c] == BoardStatus.Empty)
+            {
+                continue;
+            }
+
+            if (Board[1, c] == Board[0, c] && Board[2, c] == Board[0, c])
+            {
+                // all the same in the column
+                return (Board[0, c] == BoardStatus.FilledX) ? WinState.WinnerX : WinState.WinnerO;
+            }
+        }
+
+        // Check diagonals
+        {
+            if (Board[0, 0] == Board[1, 1] && Board[0, 0] == Board[2, 2] && Board[0, 0] != BoardStatus.Empty)
+            {
+                return (Board[0, 0] == BoardStatus.FilledX) ? WinState.WinnerX : WinState.WinnerO;
+            }
+
+            if (Board[0, 2] == Board[1, 1] && Board[0, 2] == Board[2, 0] && Board[0, 2] != BoardStatus.Empty)
+            {
+                return (Board[0, 2] == BoardStatus.FilledX) ? WinState.WinnerX : WinState.WinnerO;
+            }
+        }
+
+        // No winner, check if there are still moves or it's a draw
+        for (var r = 0; r < 3; r++)
+        {
+            for (var c = 0; c < 3; c++)
+            {
+                if (Board[r, c] == BoardStatus.Empty)
+                {
+                    return WinState.NoWinnerYet;
+                }
+            }
+        }
+
+        // No winner, no empty squares, do it's a draw
+        return WinState.Draw;
+    }
+
+    static string BoardStatusToString(BoardStatus s)
+    {
+        switch (s)
+        {
+            case BoardStatus.Empty:
+                return ".";
+            case BoardStatus.FilledX:
+                return "X";
+            case BoardStatus.FilledO:
+                return "O";
+            default:
+                throw new ArgumentOutOfRangeException(nameof(s), s, null);
+        }
+    }
+
+    public override string ToString()
+    {
+        var b00 = BoardStatusToString(Board[0, 0]);
+        var b01 = BoardStatusToString(Board[0, 1]);
+        var b02 = BoardStatusToString(Board[0, 2]);
+
+        var b10 = BoardStatusToString(Board[1, 0]);
+        var b11 = BoardStatusToString(Board[1, 1]);
+        var b12 = BoardStatusToString(Board[1, 2]);
+
+        var b20 = BoardStatusToString(Board[2, 0]);
+        var b21 = BoardStatusToString(Board[2, 1]);
+        var b22 = BoardStatusToString(Board[2, 2]);
+        return $"\n{b00}{b01}{b02}\n{b10}{b11}{b12}\n{b20}{b21}{b22}";
+    }
+}
--- a/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeGame.cs.meta
+++ b/Project/Assets/ML-Agents/Examples/TicTacToe/Scripts/TicTacToeGame.cs.meta
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