Jean-Francois Zinque

Add support for logical data types

2

**Is your feature request related to a problem? Please describe.** One limitation with the current `DataType.check()` method is that it only validates the data type, without access to the data...

Add rolling windows and cv

2

Hi. After reading #180 and #177, I thought I could give a shot at implementing cross-validation. I defined common cv procedures `ExpandingWindow()`, `SlidingWindow()`, `Holdout()` as `rolling_window` objects + 2 S3...