Calculated Feature #595

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1. WladdGorshenin commented on Jul 30, 2018

   

   WladdGorshenin

   on Jul 30, 2018

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   Hi, I'm also curious how can I convert a date field to a set of new fields like: year, month, day_of_month, day_of_week, etc?
2. AbhiOnGithub commented on Jul 30, 2018

   

   AbhiOnGithub

   on Jul 30, 2018

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   for dynamic fields using .NET Dictionaries Dictionary<"YourNewField",Value>
3. Zruty0 commented on Jul 30, 2018

   

   Zruty0

   on Jul 30, 2018

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   Hi @gironymo ,

   Your and @WladdGorshenin 's cases are perfect examples of why we want to have https://github.com/dotnet/machinelearning/blob/master/src/Microsoft.ML.Api/MapTransform.cs available through the user API.

   When it is done, you will be able to add your own transformations to the pipeline, and mix&match them with the standard ones provided by ML.NET.

   Right now, even though MapTransform is available as a public class, you will have to rewrite your entire experiment to use low-level API (and not LearningPipeline) in order to use it.

   Once we resolve #371 and #581, we will reconcile the two.
4. Zruty0

   added

   api

   on Jul 30, 2018
5. WladdGorshenin commented on Aug 1, 2018

   

   WladdGorshenin

   on Aug 1, 2018

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   Hi @AbhiOnGithub could you please elaborate a bit more?
6. Zruty0 commented on Aug 1, 2018

   

   Zruty0

   on Aug 1, 2018

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   @WladdGorshenin , the comment from @AbhiOnGithub seems to me more like a feature request.

   We definitely do not support dictionaries as sources of data right now. Nor do we have plans to do this in the near future, unless there is a compelling argument that outweighs the perf and data consistency implications of this potential feature.
7. WladdGorshenin commented on Aug 2, 2018

   

   WladdGorshenin

   on Aug 2, 2018

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   @Zruty0 is there any workaround?
8. Zruty0 commented on Aug 2, 2018

   

   Zruty0

   on Aug 2, 2018

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   @WladdGorshenin I assume you are referring to this:

   how can I convert a date field to a set of new fields like: year, month, day_of_month, day_of_week, etc?

   My best recommendation at the moment would be to perform this pre-processing prior to giving this object to ML.NET.

   Actually, now that we're merging #616 , you should be able to get away with something like this:

           public class MyDataRow
           {
               private DateTime _dateTime;
   
               public float Day { get { return _dateTime.Day; } set { throw new NotImplementedException(); } }
               public float DayOfWeek { get { return (float)_dateTime.DayOfWeek; } set { throw new NotImplementedException(); } }
               // etc
           }
9. Zruty0 commented on Aug 9, 2018

   

   Zruty0

   on Aug 9, 2018

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   I think this should be closed. Feel free to reopen to add more comments.
10. Zruty0

    closed this as completedon Aug 9, 2018
11. ghost locked as resolved and limited conversation to collaborators on Mar 29, 2022