Unity 机器学习代理工具包 (ML-Agents) 是一个开源项目,它使游戏和模拟能够作为训练智能代理的环境。
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using System.Collections.Generic;
using UnityEngine;
namespace Unity.MLAgents.Sensors
{
/// <summary>
/// A SensorComponent that creates a <see cref="GridSensorBase"/>.
/// </summary>
[AddComponentMenu("ML Agents/Grid Sensor", (int)MenuGroup.Sensors)]
public class GridSensorComponent : SensorComponent
{
// dummy sensor only used for debug gizmo
GridSensorBase m_DebugSensor;
List<ISensor> m_Sensors;
internal BoxOverlapChecker m_BoxOverlapChecker;
[HideInInspector, SerializeField]
protected internal string m_SensorName = "GridSensor";
/// <summary>
/// Name of the generated <see cref="GridSensor"/> object.
/// Note that changing this at runtime does not affect how the Agent sorts the sensors.
/// </summary>
public string SensorName
{
get { return m_SensorName; }
set { m_SensorName = value; }
}
[HideInInspector, SerializeField]
internal Vector3 m_CellScale = new Vector3(1f, 0.01f, 1f);
/// <summary>
/// The scale of each grid cell.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public Vector3 CellScale
{
get { return m_CellScale; }
set { m_CellScale = value; }
}
[HideInInspector, SerializeField]
internal Vector3Int m_GridSize = new Vector3Int(16, 1, 16);
/// <summary>
/// The number of grid on each side.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public Vector3Int GridSize
{
get { return m_GridSize; }
set
{
if (value.y != 1)
{
m_GridSize = new Vector3Int(value.x, 1, value.z);
}
else
{
m_GridSize = value;
}
}
}
[HideInInspector, SerializeField]
internal bool m_RotateWithAgent = true;
/// <summary>
/// Rotate the grid based on the direction the agent is facing.
/// </summary>
public bool RotateWithAgent
{
get { return m_RotateWithAgent; }
set { m_RotateWithAgent = value; }
}
[HideInInspector, SerializeField]
internal string[] m_DetectableTags;
/// <summary>
/// List of tags that are detected.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public string[] DetectableTags
{
get { return m_DetectableTags; }
set { m_DetectableTags = value; }
}
[HideInInspector, SerializeField]
internal LayerMask m_ColliderMask;
/// <summary>
/// The layer mask.
/// </summary>
public LayerMask ColliderMask
{
get { return m_ColliderMask; }
set { m_ColliderMask = value; }
}
[HideInInspector, SerializeField]
internal int m_MaxColliderBufferSize = 500;
/// <summary>
/// The absolute max size of the Collider buffer used in the non-allocating Physics calls. In other words
/// the Collider buffer will never grow beyond this number even if there are more Colliders in the Grid Cell.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public int MaxColliderBufferSize
{
get { return m_MaxColliderBufferSize; }
set { m_MaxColliderBufferSize = value; }
}
[HideInInspector, SerializeField]
internal int m_InitialColliderBufferSize = 4;
/// <summary>
/// The Estimated Max Number of Colliders to expect per cell. This number is used to
/// pre-allocate an array of Colliders in order to take advantage of the OverlapBoxNonAlloc
/// Physics API. If the number of colliders found is >= InitialColliderBufferSize the array
/// will be resized to double its current size. The hard coded absolute size is 500.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public int InitialColliderBufferSize
{
get { return m_InitialColliderBufferSize; }
set { m_InitialColliderBufferSize = value; }
}
[HideInInspector, SerializeField]
internal Color[] m_DebugColors;
/// <summary>
/// Array of Colors used for the grid gizmos.
/// </summary>
public Color[] DebugColors
{
get { return m_DebugColors; }
set { m_DebugColors = value; }
}
[HideInInspector, SerializeField]
internal float m_GizmoYOffset = 0f;
/// <summary>
/// The height of the gizmos grid.
/// </summary>
public float GizmoYOffset
{
get { return m_GizmoYOffset; }
set { m_GizmoYOffset = value; }
}
[HideInInspector, SerializeField]
internal bool m_ShowGizmos = false;
/// <summary>
/// Whether to show gizmos or not.
/// </summary>
public bool ShowGizmos
{
get { return m_ShowGizmos; }
set { m_ShowGizmos = value; }
}
[HideInInspector, SerializeField]
internal SensorCompressionType m_CompressionType = SensorCompressionType.PNG;
/// <summary>
/// The compression type to use for the sensor.
/// </summary>
public SensorCompressionType CompressionType
{
get { return m_CompressionType; }
set { m_CompressionType = value; UpdateSensor(); }
}
[HideInInspector, SerializeField]
[Range(1, 50)]
[Tooltip("Number of frames of observations that will be stacked before being fed to the neural network.")]
internal int m_ObservationStacks = 1;
/// <summary>
/// Whether to stack previous observations. Using 1 means no previous observations.
/// Note that changing this after the sensor is created has no effect.
/// </summary>
public int ObservationStacks
{
get { return m_ObservationStacks; }
set { m_ObservationStacks = value; }
}
/// <inheritdoc/>
public override ISensor[] CreateSensors()
{
m_Sensors = new List<ISensor>();
m_BoxOverlapChecker = new BoxOverlapChecker(
m_CellScale,
m_GridSize,
m_RotateWithAgent,
m_ColliderMask,
gameObject,
m_DetectableTags,
m_InitialColliderBufferSize,
m_MaxColliderBufferSize
);
// debug data is positive int value and will trigger data validation exception if SensorCompressionType is not None.
m_DebugSensor = new GridSensorBase("DebugGridSensor", m_CellScale, m_GridSize, m_DetectableTags, SensorCompressionType.None);
m_BoxOverlapChecker.RegisterDebugSensor(m_DebugSensor);
var gridSensors = GetGridSensors();
if (gridSensors == null || gridSensors.Length < 1)
{
throw new UnityAgentsException("GridSensorComponent received no sensors. Specify at least one observation type (OneHot/Counting) to use grid sensors." +
"If you're overriding GridSensorComponent.GetGridSensors(), return at least one grid sensor.");
}
foreach (var sensor in gridSensors)
{
if (ObservationStacks != 1)
{
m_Sensors.Add(new StackingSensor(sensor, ObservationStacks));
}
else
{
m_Sensors.Add(sensor);
}
m_BoxOverlapChecker.RegisterSensor(sensor);
}
// Only one sensor needs to reference the boxOverlapChecker, so that it gets updated exactly once
((GridSensorBase)m_Sensors[0]).m_BoxOverlapChecker = m_BoxOverlapChecker;
return m_Sensors.ToArray();
}
/// <summary>
/// Get an array of GridSensors to be added in this component.
/// Override this method and return custom GridSensor implementations.
/// </summary>
/// <returns>Array of grid sensors to be added to the component.</returns>
protected virtual GridSensorBase[] GetGridSensors()
{
List<GridSensorBase> sensorList = new List<GridSensorBase>();
var sensor = new OneHotGridSensor(m_SensorName + "-OneHot", m_CellScale, m_GridSize, m_DetectableTags, m_CompressionType);
sensorList.Add(sensor);
return sensorList.ToArray();
}
/// <summary>
/// Update fields that are safe to change on the Sensor at runtime.
/// </summary>
internal void UpdateSensor()
{
if (m_Sensors != null)
{
m_BoxOverlapChecker.RotateWithAgent = m_RotateWithAgent;
m_BoxOverlapChecker.ColliderMask = m_ColliderMask;
foreach (var sensor in m_Sensors)
{
((GridSensorBase)sensor).CompressionType = m_CompressionType;
}
}
}
void OnDrawGizmos()
{
if (m_ShowGizmos)
{
if (m_BoxOverlapChecker == null || m_DebugSensor == null)
{
return;
}
m_DebugSensor.ResetPerceptionBuffer();
m_BoxOverlapChecker.UpdateGizmo();
var cellColors = m_DebugSensor.PerceptionBuffer;
var rotation = m_BoxOverlapChecker.GetGridRotation();
var scale = new Vector3(m_CellScale.x, 1, m_CellScale.z);
var gizmoYOffset = new Vector3(0, m_GizmoYOffset, 0);
var oldGizmoMatrix = Gizmos.matrix;
for (var i = 0; i < m_DebugSensor.PerceptionBuffer.Length; i++)
{
var cellPosition = m_BoxOverlapChecker.GetCellGlobalPosition(i);
var cubeTransform = Matrix4x4.TRS(cellPosition + gizmoYOffset, rotation, scale);
Gizmos.matrix = oldGizmoMatrix * cubeTransform;
var colorIndex = cellColors[i] - 1;
var debugRayColor = Color.white;
if (colorIndex > -1 && m_DebugColors.Length > colorIndex)
{
debugRayColor = m_DebugColors[(int)colorIndex];
}
Gizmos.color = new Color(debugRayColor.r, debugRayColor.g, debugRayColor.b, .5f);
Gizmos.DrawCube(Vector3.zero, Vector3.one);
}
Gizmos.matrix = oldGizmoMatrix;
}
}
}
}