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Default printing of tensors in notebooks causes exception

See original GitHub issue

The default printing of scalar tensors in F# .NET Interactive notebooks causes an exception:

create an F# notebook at https://mybinder.org/v2/gh/dotnet/interactive/master?urlpath=lab
Run this

#i "nuget: https://ci.appveyor.com/nuget/diffsharp"
#r "nuget: DiffSharp-lite,0.9.5-preview-2006281542" // update version as needed, see a recent build in https://ci.appveyor.com/project/dsyme/diffsharp/history

open DiffSharp

dsharp.tensor 3.0

Expected: nice printing of tensor

Actual: exception "Cannot enumerate Tensor with dim "

Oddly also applies to tensors of any dimension.

   at Microsoft.FSharp.Core.PrintfModule.PrintFormatToStringThenFail@1639.Invoke(String message) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\printf.fs:line 1639
   at DiffSharp.Tensor.System-Collections-Generic-IEnumerable`1-GetEnumerator()
   at System.Linq.Enumerable.SelectIterator[TSource,TResult](IEnumerable`1 source, Func`3 selector)+MoveNext()
   at Microsoft.DotNet.Interactive.Formatting.EnumerableExtensions.TakeAndCountRemaining[T](IEnumerable`1 source, Int32 count) in F:\workspace\_work\1\s\src\Microsoft.DotNet.Interactive.Formatting\EnumerableExtensions.cs:line 19
   at Microsoft.DotNet.Interactive.Formatting.HtmlFormatter`1.<>c__DisplayClass7_0.<CreateForSequence>g__BuildTable|3(T source, TextWriter writer) in F:\workspace\_work\1\s\src\Microsoft.DotNet.Interactive.Formatting\HtmlFormatter{T}.cs:line 112

Issue Analytics

State:
Created 3 years ago
Comments:9 (4 by maintainers)

Top GitHub Comments

1reaction

dsymecommented, Aug 26, 2020

thanks!

0reactions

gbaydincommented, Aug 26, 2020

Well, I do just think a lot of .NET stuff may have a problem with an infinite unrolling of IEnumerable. It’s just asking for trouble…

Ok, I’m convinced. We can merge #153 and move on. I think the Tensor -> IEnumerable use case is also available through the .unstack() method that you used in the PR.

I think the formatter for dotnet interactive is a separate issue we can work on.

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