https://learn.microsoft.com/en-us/dotnet/api/microsoft.ml.data.estimatorchain-1?view=ml-dotnet-preview
EstimatorChainTLastTransformer Class (Microsoft.ML.Data) | Microsoft Learn
Represents a chain (potentially empty) of estimators that end with a TLastTransformer. If the chain is empty, TLastTransformer is always ITransformer.
classmicrosoftmldatalearn