One of the FeaturizeText extensions has the inputColumnNames as required

[sfilipi]

The are two extensions for Featurize text.

    public static TextFeaturizingEstimator FeaturizeText(this TransformsCatalog.TextTransforms catalog, string outputColumnName, string inputColumnName = null);

    public static TextFeaturizingEstimator FeaturizeText(this TransformsCatalog.TextTransforms catalog, string outputColumnName, IEnumerable<string> inputColumnNames, TextFeaturizingEstimator.Options options);

IMO,

• On the first one, TextFeaturizingEstimator.Options options should exist as optional.
• On the second one, TextFeaturizingEstimator.Options options should exist as optional.

ATM, if i want to use the TextFeaturizingEstimator.Options, i have to create an IEnumerable for inputColumnNames and give it the output column name.

mlContext.Transforms.Text.FeaturizeText("CarrierName",
    Enumerable.Repeat("CarrierName", 1),
    new TextFeaturizingEstimator.Options
    {
              KeepDiacritics = false,
              KeepPunctuations = false,
              TextCase =TextNormalizingEstimator.CaseNormalizationMode.Lower,
              OutputTokens = true,
              VectorNormalizer = TextFeaturizingEstimator.TextNormKind.L2
     }))

[TomFinley]

Interesting find, thank you @sfilipi. As far as I can see, elsewhere when we have options, we have only those options, and they are non-optional. This pursuant to #1798. So it seems like the second signature should not take inputColumnNames, but it should instead have an input column names on its options. (Which as far as I can tell it does.) By having both, we are inviting the potential of the question "who wins" on these two settings. (See again #1798.)

So I would prefer to solve this in another way:

1. The first one stays as is.
2. The second one does not accept IEnumerable, but instead takes an option.

If we find that some advanced options are in fact valuable, we should consider adding them as (probably) optional parameters to the first one.

[sfilipi]

Completed in #2815