Add a sample for copy columns. #2351
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singlis
reviewed
Jan 31, 2019
| string labelColumnName = "Label"; | ||
| var pipeline = mlContext.Transforms.CopyColumns(labelColumnName, "Age") as IEstimator<ITransformer>; | ||
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| // You also may want to copy a column to perform some hand featurization |
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I think you mean handy featurization right?
(totally my opinion) but I would change this intro though to be a bit more explicit as to what is happening:
A custom delegate can also be used with CopyColumns to generate new featurization. In this example, we are copying the Parity column to the CustomValue column, however CustomColumn will be set to 1 if the Parity goes above a threshold.
sfilipi
reviewed
Jan 31, 2019
| var transformedData = pipeline.Fit(trainData).Transform(trainData); | ||
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| // Now let's take a look at what these CopyColumns operations did. | ||
| // We can extract the newly created column as an IEnumerable of SampleInfertDataWithLabelAndValue, the class we define below. |
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SampleInfertDataWithLabelAndValue [](start = 76, length = 33)
SampleInfertDataTransformed
sfilipi
reviewed
Jan 31, 2019
| .Append(mlContext.Transforms.CustomMapping(mapping, null)); | ||
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| // Now we can transform the data and look at the output | ||
| // Don't forget that this operation doesn't actually evaluate data until we materialize the data below. |
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materialize [](start = 88, length = 11)
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ghost
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This PR adds a sample for copy columns, and moves the SchemaManipulation transform samples under a Transforms/ folder.
Fixes #2350