https://learn.microsoft.com/en-us/dotnet/api/microsoft.ml.categoricalcatalog.onehothashencoding?view=ml-dotnet-preview
CategoricalCatalog.OneHotHashEncoding Method (Microsoft.ML) | Microsoft Learn
Create a OneHotHashEncodingEstimator, which converts one or more input text columns specified by columns into as many columns of hash-based one-hot encoded...
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