NoColumn Attribute not recognized by TextLoaderSaverCatalog.LoadFromTextFile Method

[ghost]

System information

• OS version/distro: Windows 10/ Home

• .NET Version (eg., dotnet --info):
  .NET Core SDK (reflecting any global.json):
  Version: 3.1.101
  Commit: b377529961

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19041
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.101\

Issue

• What did you do?
  Tried to run the following code to load my training data out of a CSV file. I've been using the AutoML CLI to this point to generate my models, and thought I'd take crack at doing it via my .NET code. The ModelInput class has been working at runtime to load my metrics into, and pass to the model trained using the CLI, for predictions, even with the extra columns in the class.

MLContext mlContext = new MLContext();
IDataView trainDataView = mlContext.Data.LoadFromTextFile<ModelInput>("data/data.csv", hasHeader: true);

• What happened?
  Get error:

System.InvalidOperationException: Property 'Change_Tomorrow' is missing the LoadColumnAttribute attribute
   at Microsoft.ML.Data.TextLoader.CreateTextLoader[TInput](IHostEnvironment host, Options options, IMultiStreamSource dataSample)
   at Microsoft.ML.Data.TextLoader.CreateTextLoader[TInput](IHostEnvironment host, Boolean hasHeader, Char separator, Boolean allowQuoting, Boolean supportSparse, Boolean trimWhitespace, IMultiStreamSource dataSample)
   at Microsoft.ML.TextLoaderSaverCatalog.LoadFromTextFile[TInput](DataOperationsCatalog catalog, String path, Char separatorChar, Boolean hasHeader, Boolean allowQuoting, Boolean trimWhitespace, Boolean allowSparse)

• What did you expect?
  Data to be loaded from my csv file into an IDataView

Source code / logs

• ModelInput Class
  This is a trimmed down version of my ModelInput class. Note that the "Index(0)" attribute and the "Ignore" attribute come from the "CsvHelper" Nuget package, as I use this ModelInput class for both writing to Csv, and for input for model predictions.

    public class ModelInput
    {
        [ColumnName("Country"), LoadColumn(0), Index(0)]
        public string Country { get; set; }
        [Ignore, NoColumn]
        public float Change_Tomorrow { get; set; }
        [Ignore, NoColumn]
        public DateTime DateTomorrow { get; set; }
    }

Please paste or attach the code or logs or traces that would be helpful to diagnose the issue you are reporting.

[mstfbl]

Hi @scyentyfyc ,

Thank you for reporting this issue. Can you please attach the CSV file you're trying to load? I will attempt to replicate your issue and let you know of a fix. Thanks.

[mstfbl]

Hi @scyentyfyc ,

I attempted to repro your issue with a small fake CSV dataset according to ModelInput, and I was not able to obtain the InvalidOperationException you reported. Please feel free to share the CSV file with which you've reported this exception.

[mstfbl]

Closing issue as needed dataset to debug was not provided. @scyentyfyc please feel free to provide it to continue the investigation of this issue. Thanks.