xamarinios 
namespace Microsoft.ML
{
    public static class TreeExtensions
    {
        public static FastForestRegressionTrainer FastForest(this RegressionTrainers catalog, string labelColumnName = "Label", string featureColumnName = "Features", string exampleWeightColumnName = null, int numberOfLeaves = 20, int numberOfTrees = 100, int minimumExampleCountPerLeaf = 10);
    }
}
nuget.org
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinios
Assembly

Microsoft.ML.FastTree , Version=1.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to Microsoft.ML.FastTree.

Package Microsoft.ML.FastTree (5.0.0-preview.1.25127.4) netstandard2.0
Preview This API is contained in a prerelease package.
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API