在iOS中使用Swift进行决策的最佳方式是什么

Question

我想用一个简单的AI做一个简单的应用程序。我做了大量的研究，找到了一些关于决策树、规则和行为树的文章。

我在展示新GKDecisionTree的WWDC2016上看到了一段视频。也许这对我的应用程序来说是一个简单的解决方案。

我尝试了这段代码，但在这一行得到了一个错误：

let tree = GKDecisionTree(attribute: "anrgy?")

参数类型“String”不符合预期的类型“NSObjectProtocol”

        // SETUP TREE
        let tree = GKDecisionTree(attribute: "anrgy?")
        let root = tree?.rootNode
        // ADD BRANCH

        // Create branches
        root.createBranch(value: true, attribute: "attack")
        let goAway = root.createBranch(value: false, attribute: "goAway")


        // Create actions for when nearby
        goAway.createBranch(withWeight: 9, attribute: "Left")
        goAway.createBranch(withWeight: 1, attribute: "Right")

        // Find action for answers
        // Find action for answers
        let answers = ["anrgy?" : true]
        tree.findActionForAnswers(answers: answers)

请让我知道，如果有更好的方法，一个简单的人工智能或如何解决这个例子。

谢谢你的帮助。

Answer 1

这段代码正在运行：

        // SETUP TREE
        let tree = GKDecisionTree(attribute: "anrgy?" as NSObjectProtocol)
        let root = tree.rootNode
        // ADD BRANCH

        // Create branches
        root?.createBranch(value: true, attribute: "attack" as NSObjectProtocol)
        let goAway = root?.createBranch(value: false, attribute: "goAway" as NSObjectProtocol)


        // Create actions for when nearby
        goAway?.createBranch(weight: 9, attribute: "Left" as NSObjectProtocol)
        goAway?.createBranch(weight: 1, attribute: "Right" as NSObjectProtocol)

        // Find action for answers
        // Find action for answers
        let answers = ["anrgy?" : false]
        let decisionAction = tree.findAction(forAnswers: answers as [AnyHashable : NSObjectProtocol])
        print("Answer: \(String(describing: decisionAction!))")
    }

但是这是一个好的编码风格吗？还有比使用GKDecisionTree更好的方法吗？

Answer 2

以下是基于您的示例使用学习决策树的替代方案。手动定义的决策树和学习的决策树都使用GKDecisionTree类，但初始化器不同：

let attributes = [ "angry?", "goAway" ]
let examples = [
    [true, 0],
    [false, 9],
    [false, 1],
]
let actions = [
    "attack",
    "Left",
    "Right",
]
let tree = GKDecisionTree(examples: examples as NSArray as! [[NSObjectProtocol]],
                          actions:    actions   as NSArray as! [NSObjectProtocol],
                          attributes: attributes as NSArray as! [NSObjectProtocol])

let answers = ["angry?" : true as NSObjectProtocol, 
               "goAway": 1 as NSObjectProtocol]
let decisionAction2 = tree.findAction(forAnswers: answers)