有些事情没有按预期工作，我无法解决…我想从一个列表中加载数据。我尝试了几种代码

MLContext mlContext = new MLContext();        var listData = new List<ProductEntry>        {            new ProductEntry {CoPurchaseProductID = 12, ProductID = 4},            new ProductEntry {CoPurchaseProductID = 12, ProductID = 3},            new ProductEntry {CoPurchaseProductID = 11, ProductID = 5},            new ProductEntry {CoPurchaseProductID = 11, ProductID = 3}        };        var data = mlContext.Data.LoadFromEnumerable(listData);        var options = new MatrixFactorizationTrainer.Options        {            MatrixColumnIndexColumnName = nameof(ProductEntry.ProductID),            MatrixRowIndexColumnName = nameof(ProductEntry.CoPurchaseProductID),            LabelColumnName = "Label",            LossFunction = MatrixFactorizationTrainer.LossFunctionType.SquareLossOneClass,            Alpha = 0.01,            Lambda = 0.025,            Quiet = false,            C = 0.00001,            ApproximationRank = 10,            NumberOfIterations = 20        };        var est = mlContext.Recommendation().Trainers.MatrixFactorization(options);        ITransformer model = est.Fit(data);        var predictionengine = mlContext.Model.CreatePredictionEngine<ProductEntry, Copurchase_prediction>(model);        Console.WriteLine("计算产品3的前3个推荐产品...");        var top5 = (from m in Enumerable.Range(1, 262111)                    let p = predictionengine.Predict(                        new ProductEntry()                        {                            ProductID = 3,                            CoPurchaseProductID = (uint)m                        })                    orderby p.Score descending                    select (ProductID: m, Score: p.Score)).Take(10);        foreach (var t in top5)            Console.WriteLine($"  分数:{t.Score}\t产品: {t.ProductID}");        Console.ReadKey();

我遇到了关于“Label”的问题。这是相关的类定义:

public class Copurchase_prediction    {        public float Score { get; set; }    }    public class ProductEntry    {        [KeyType(count: 262111)]        public float Label { get; set; }        [KeyType(count: 262111)]        public uint ProductID { get; set; }        [KeyType(count: 262111)]        public uint CoPurchaseProductID { get; set; }    }

出现的错误是:

System.ArgumentOutOfRangeException: ‘成员 Label 标记了 KeyType 属性，但似乎不是键类型的有效数据类型（参数 ‘userType’）’

有什么想法吗？谢谢大家！

回答：

删除 [KeyType(count: 262111)] 注释对于 public float Label { get; set; } 属性

Label 不是键