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__James__'s avatar
__James__
Copper Contributor
May 25, 2022

AutoML

Hi, I was looking for some answers on training.   I like how the AutoML works, especially when the parameters are auto tweaked for a better fit.   Is there a way to select a specific algorithm an...
ML.NET
LuisQuintanilla's avatar
LuisQuintanilla
Icon for Microsoft rankMicrosoft
Jun 01, 2022

Hi __James__

 

Thanks for your question. We've recently created a series of notebooks going over several getting started and E2E ML scenarios with ML.NET. One of those is on training with AutoML.

I encourage you to check them out.

 

 

There are a few ways to do what you're asking. One is to exclude some algorithms using the experiment API. That's highlighted in this notebook: csharp-notebooks/03-Training and AutoML.ipynb at main · dotnet/csharp-notebooks (github.com) 

 

var pipeline = 
  context.Transforms.Concatenate("Features", "X")
    .Append(context.Auto().Regression("y", useLbfgs: false, useSdca: false, useFastForest: false));

 

The other is to use SweepableEstimators directly and have AutoML search for the hyperparameters. That is highlighted in this notebook: csharp-notebooks/E2E-Forecasting using SSA with Luna Dataset.ipynb at main · dotnet/csharp-notebooks (github.com)

 

var pipeline = 
  mlContext.Transforms.CopyColumns("newLoad", "load")
    .Append(mlContext.Auto().CreateSweepableEstimator((context, ss) =>
    {
      return mlContext.Forecasting.ForecastBySsa("predict", "load", ss.WindowSize, ss.SeriesLength, Convert.ToInt32(trainDf.Rows.Count), 1, rank: ss.Rank, variableHorizon: true);
    }, searchSpace));

 

Note that in both of these cases, they're using the preview version of the AutoML API which you can get access to from the daily ML.NET NuGet feed. 

https://pkgs.dev.azure.com/dnceng/public/_packaging/MachineLearning/nuget/v3/index.json

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