I am trying to use PermutationFeatureImportance (PFI) with F# but the F# type system is not resolving ITransformer to ISingleFeaturePredictionTransformer - which is required by PFI.

I believe it is due to IPredictorProducing (and related interfaces) being marked as "internal".

F# supports explicit interfaces and maybe that is the reason for this issue.

Here is a snippet of code that shows what I am trying to do
(I am using the latest bits - v 1.2.0 at the time of this post)

let mutable schema = null
let mdl = ctx.Model.Load(@"F:\fwaris\data\t\analysis\model_cv_LightGbmBinary.bin", &schema) 
let mdlt =  mdl :?> TransformerChain<ITransformer>
let m1 =  mdlt.LastTransformer //debugger shows it is Microsoft.ML.Data.BinaryPredictionTransformer<Microsoft.ML.IPredictorProducing<float>>
let scored = mdl.Transform(trainView)
scored.Preview()
ctx.BinaryClassification.PermutationFeatureImportance(m1 :?> _,scored)

@dsyme