dotnet / dotnet/machinelearning-modelbuilder

Configurable MissingValueReplacingEstimator.ReplacementMode

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Description

**Is your feature request related to a problem? Please describe.**
Modelbuilder appears to replace all missing values with `default(T)`, also known as `MissingValueReplacingEstimator.ReplacementMode.DefaultValue`. In some cases this might not be desirable.

**Describe the solution you'd like**
I'd like the ability to configure different missing-value-replacement-modes, ideally per-column.

**Describe alternatives you've considered**
I edit the generated code manually.

**Additional context**
No

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