Invalid call to GetValue

[agerewines]

I'm trying to implement this GetBestThreePredictions() in my code, but I keep getting this error and don't know how to fix it. Seems an error inside Microsoft.ML.DataViewSchema.

Is there anyone who can help me? Thanks

https://github.com/dotnet/machinelearning-samples/blob/c778296f22edaa21956f55db9e0a4a44d8ccf4b9/samples/csharp/end-to-end-apps/MulticlassClassification-GitHubLabeler/GitHubLabeler/GitHubLabelerConsoleApp/Labeler.cs#L81

[AbhiAgarwal192]

@ImGere Hey, what is the error you are getting?

[agerewines]

[CESARDELATORRE]

@Ivanidzo4ka - Ivan, since you are "the man" for this feature (Scores per prediction) could you help with this issue please? 👍

[agerewines]

Help would be appreciated because I'm stuck with the development of this ML model since I need to be able to get back multiple values

[Ivanidzo4ka]

Can you use GetKeyValues rather than GetSlotNames?

https://github.com/dotnet/machinelearning/blob/45b6c43387294d19cad843a21e87539213e8d34c/src/Microsoft.ML.Data/Data/SchemaAnnotationsExtensions.cs By the time we wrote sample GetKeyValues wasn't present, and I was confused by slot names.

[agerewines]

Hi I tried what you suggested but stiil have the same error. The library version is 1.2.0

[GMihalkow]

Any progress on this issue?

[GioGallo]

Hi , Any progress on this issue?

[agerewines]

Not from my side. I moved my work to Python and Scikit learn library.

[mehtanilay10]

I also check with GetSlotNames and GetKeyValues. But getting same error in both. I am using version 1.5.0-preview. Any further updates for this issue?

[Webritter]

I have the same error! I'm using version 1.4.0 Have you found a solution?

[agerewines]

Unfortunately guys I'm not working on ML.NET anymore. You should create a new Issue under this repo since this can be hard to find.

Have a nice day!

[udonmez]

using 1.5 and still get the same error! I recreated project with data now it is working and then I tried to update my old project with but again I got the same error. :(

[mhmd-azeez]

How is this still not solved? I am getting the same error. I tried both GetKeyValues and GetSlotNames. cc @Ivanidzo4ka @CESARDELATORRE I am using 1.5.2

[AmSmart]

Hi guys, this issue can easily be resolved by building the pipeline properly and extracting only the desired values. Check out my StackOverflow answer. I hope it helps, had a hard time figuring out a workaround. You don't necessarily need GetSlotNames or GetKeyValues to get your raw data.

[ccheinemann]

I know this is an old question and you've either given up or solved it another way but I hope this helps someone.

I also struggled with this. I took the code from the "github tag" example project and used it in my project. I discovered that it only worked with "text" data types. In my need, if I made my inputs (which are naturally Single) into strings the above "GetSlotNames" f(x) worked. If I switched it back, it broke.

I can only assume this is an issue with the underlying framework not having the correct GetValue because if you inspect the data with the debugger the key mappings are there.

[m-wild]

This can also be fixed by specifying addKeyValueAnnotationsAsText when mapping values to keys:

// e.g. CategoryId is an int column...
ml.Transforms.Conversion.MapValueToKey("Label", "CategoryId", addKeyValueAnnotationsAsText: true)