https://learn.microsoft.com/en-us/dotnet/api/microsoft.ml.transforms.valuemappingestimator.getoutputschema?view=ml-dotnet-preview
ValueMappingEstimator.GetOutputSchema(SchemaShape) Method (Microsoft.ML.Transforms) | Microsoft...
Returns the SchemaShape of the schema which will be produced by the transformer. Used for schema propagation and verification in a pipeline.
methodmicrosoftmltransforms