MlContext不了解我的体温类型

Question

我是 ML.NET 初学者，我的数据有点问题。当我把它们放在mlContext.Fit（...）中时;这是我收到的错误：Column 'Temperature' has values of I4which is not the same as earlier observed type of R4.这是我的代码：try            {                var mlContext = new MLContext();                var reader = mlContext.Data.CreateTextReader<TrainData>(separatorChar: ',', hasHeader: false);                var trainData = _context.Datas.Last();                IDataView trainingdataView = reader.Read(Path.Combine(hostingEnvironment.WebRootPath, "data010220192341.txt"));                var pipeline = mlContext.Transforms.Conversion.MapValueToKey("Delay")                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("StationDepart"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("StationArrival"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("Day"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("Train"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("WeatherText"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("HasPrecipitation"))                    .Append(mlContext.Transforms.Categorical.OneHotEncoding("PrecipitationType"))                    .Append(mlContext.Transforms.Concatenate("Features", "StationDepart", "StationArrival", "Day", "Train", "WeatherText", "Temperature", "Humidity", "HasPrecipitation", "PrecipitationType", "Time"))                    .Append(mlContext.MulticlassClassification.Trainers.StochasticDualCoordinateAscent(labelColumn: "Delay", featureColumn: "Features"))                    .Append(mlContext.Transforms.Conversion.MapKeyToValue("PredictedTime"));                var model = pipeline.Fit(trainingdataView);                var prediction = model.CreatePredictionEngine<TrainData, TrainPrediction>(mlContext).Predict(       

Answer 1

问题在于时间，延迟和温度需要处于浮动状态，而不是整数。

public class TrainData
    {
        [LoadColumn(0)]        public string StationDepart { get; set; }
        [LoadColumn(1)]        public string StationArrival { get; set; }
        [LoadColumn(2)]        public string Day { get; set; }
        [LoadColumn(3)]        public string Train { get; set; }
        [LoadColumn(4)]        public string WeatherText { get; set; }
        [LoadColumn(5)]        public float Temperature { get; set; }
        [LoadColumn(6)]        public float Humidity { get; set; }
        [LoadColumn(7)]        public bool HasPrecipitation { get; set; }
        [LoadColumn(8)]        public string PrecipitationType { get; set; }
        [LoadColumn(9)]        public float Time { get; set; }
        [LoadColumn(10)]        public float Delay { get; set; }
    }