I am using Accord.NET in F# for the first time and I am having problems creating the function to calculate the distance for KNN.

Here is my code

```
static member RunKNN =
let inputs = MachineLearningEngine.TrainingInputClass
let outputs = MachineLearningEngine.TrainingOutputClass
let knn = new KNearestNeighbors<int*int*int*int>(1,inputs,outputs,null)
let input = 1,1,1,1
knn.Compute(input)
```

When I swap out the null for a function like this

```
let distanceFunction = fun (a:int,b:int,c:int,d:int)
(e:int,f:int,g:int,h:int)
(i:float) ->
0
```

I get an exception like this:

*Error 1 This expression was expected to have type System.Func<(int * int * int * int),(int * int * int * int),float> but here has type int * int * int * int -> int * int * int * int -> float -> int*

So far, the only article I found close to my problem is this one. Apparently, there is a problem with how F# and C# handle delegates?

I posted this same question on the Google group for Accord.NET here.

Thanks in advance