The method Read of TextLoader does not check for the presence of the file.

[sdg002]

System information

• OS version/distro:Windows 10
• .NET Version (eg., dotnet --info): .NET 4.6

Issue

• What did you do?
• What happened?
• What did you expect?

Source code / logs

The method Read of the class TextLoader does not validate the presence of the input file. I understand that there is an element of lazy loading here. But, it would help to get feedback earlier in the form of System.IO.FileNotFoundException

[nextnode-managedcode]

I would like to work on this issue.

[mstfbl]

Hi @sdg002 , can you please specify which exact method of TextLoader you are talking about? I can't find a function "Read" of TextLoader.

[mstfbl]

Update: I believe the "Read" method @sdg002 is referring to was the ReadFromTextFile function, that is now renamed LoadFromTextFile:

machinelearning/src/Microsoft.ML.Data/DataLoadSave/Text/TextLoaderSaverCatalog.cs

Lines 148 to 154 in a072b5e

	public static IDataView LoadFromTextFile<TInput>(this DataOperationsCatalog catalog,
	string path,
	char separatorChar = TextLoader.Defaults.Separator,
	bool hasHeader = TextLoader.Defaults.HasHeader,
	bool allowQuoting = TextLoader.Defaults.AllowQuoting,
	bool trimWhitespace = TextLoader.Defaults.TrimWhitespace,
	bool allowSparse = TextLoader.Defaults.AllowSparse)