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Breaking changes from ML.NET v0.9 to v0.10 impacting ML.NET Samples

The following are the breaking changes that were impacting the ML.NET samples (at https://github.com/dotnet/machinelearning-samples) when moving to v0.10:

  1. IDataView moved to a different NuGet package: a. Error: error CS0246: The type or namespace name 'IDataView' could not be found (are you missing a using directive or an assembly reference?) b. Fix: Add using Microsoft.Data.DataView; i. The new NuGet package is added automatically when using 0.10 version

  2. AsEnumerable() moved to mlContext.CreateEnumerable() a. Error: Severity Code Description Project File Line Suppression State Error CS1501 No overload for method 'AsEnumerable' takes 2 arguments BikeSharingDemand D:\GitRepos\machinelearning-samples-0.10migration\samples\csharp\common\ConsoleHelper.cs 181 Active

  3. Use pipeline Cache for most of the pipelines so there are no issues in VS F5

  4. AsEnumerable functionality in IdataView is replaced with CreateEnumerable in MLContext class

    a. Error : CS1929 'IDataView' does not contain a definition for 'CreateEnumerable' data.AsEnumerable(env, reuseRowObject: false)

    a. Fix: env.CreateEnumerable(data, reuseRowObject: false) Where data -> IdataView and env ->MLContext

  5. 'BinaryClassificationContext' is replaced with BinaryClassificationCatalog a. Error CS0246 The type or namespace name 'BinaryClassificationContext' could not be found (are you missing a using directive or an assembly reference?) b. Fix: use BinaryClassificationCatalog class

  6. Order of input and ouput columns is changed in API calls. a. Run time Exception: unable to find "PCSFeatures" in CustomerSegmentation.Train project b. Fix: the order of columns is changed from ML 0.9 to ML 0.10 in the below API call Example In ML 0.9: var dataProcessPipeline = new PrincipalComponentAnalysisEstimator(mlContext, "Features", "PCAFeatures", rank: 2)

    Example In ML 0.10

    var dataProcessPipeline = new PrincipalComponentAnalysisEstimator(env:mlContext, outputColumnName:"PCAFeatures", inputColumnName: "Features", rank: 2)

  7. Order of input and output columns is changed in API calls

    a. Error: Error: System.ArgumentOutOfRangeException: 'Could not find input column 'Label' - Parameter name: inputSchema'

    a. Fix: change the order of input and output columns according to syntax in API. OR a. Error CS1739 The best overload for 'Normalize' does not have a parameter named 'inputName'
    Example:

	 var dataProcessPipeline = mlContext.Transforms.CopyColumns("FareAmount", "Label")
		                                                       .Append(mlContext.Transforms.Normalize(inputName: "PassengerCount", mode: NormalizerMode.MeanVariance))    
b. Fix: Change the order according to syntax. Here mandatory column is output column. Input column is optional.  
Example:                               

var dataProcessPipeline = mlContext.Transforms.CopyColumns("FareAmount", "Label") .Append(mlContext.Transforms.Normalize(outputColumnName : "PassengerCount", mode: NormalizerMode.MeanVariance))

  1. MatrixFactorization package is replaced with Recommender. a. Error : NU1102 Unable to find package Microsoft.ML.MatrixFactorization with version (>= 0.10.0) b. Fix: edit the project file and replace "Microsoft.ML.MatrixFactorization" with "Microsoft.ML.Recommender"

  2. Contiguous and Min variables are removed in KeyType Dataattribute
    a. Error: CS0246 The type or namespace name 'Contiguous' could not be found (are you missing a using directive or an assembly reference?)
    Example: public class ProductEntry { [KeyType(Contiguous = true, Count = 262111, Min = 0)] public uint ProductID { get; set; }

             [KeyType(Contiguous = true, Count = 262111, Min = 0)]
             public uint CoPurchaseProductID { get; set; }
         }
    

    b. Fix: Remove Contiguous and Min variables. KeyType contains only Count variable. Example: [KeyType(Count = 262111)]

  3. Seperator is replacedwith seperatorChar a. Error : CS0117 'TextLoader.Arguments' does not contain a definition for 'Separator'
    b. Fix: Replace seperator with seperatorChar

  4. KeyRange is replaced with KeyCount a. Error : CS1503 Argument 3: cannot convert from 'Microsoft.ML.Data.TextLoader.Range[]' to 'int'
    Error : CS0246 The type or namespace name 'KeyRange' could not be found (are you missing a using directive or an assembly reference?)

    Example:

new TextLoader.Column("ProductID", DataKind.U4, new [] { new TextLoader.Range(0) }, new KeyRange(0, 262110)),

b. Fix: use KeyCount isntead of KeyRange

Example:

new TextLoader.Column("ProductID", DataKind.U4, new [] { new TextLoader.Range(0) }, new KeyCount(262111))

  1. AdvancedSettings is removed while initializing MatrixFactorization trainer and replaced with Options a. Error : CS1739 The best overload for 'MatrixFactorization' does not have a parameter named 'advancedSettings'
    Example:

var est = ctx.Recommendation().Trainers.MatrixFactorization("ProductID", "CoPurchaseProductID", labelColumn: "Label", advancedSettings: s => { s.LossFunction = MatrixFactorizationTrainer.LossFunctionType.SquareLossOneClass; s.Alpha = 0.01; s.Lambda = 0.025; // For better results use the following parameters //s.K = 100; //s.C = 0.00001; });

b. Fix: Create a new options variable and assign the values as below. Pass the 'options' variable as parameter to trainer

MatrixFactorizationTrainer.Options options = new MatrixFactorizationTrainer.Options(); options.MatrixColumnIndexColumnName = nameof(ProductEntry.ProductID); options.MatrixRowIndexColumnName = nameof(ProductEntry.CoPurchaseProductID); options.LabelColumnName= DefaultColumnNames.Label; options.LossFunction = MatrixFactorizationTrainer.LossFunctionType.SquareLossOneClass; options.Alpha = 0.01; options.Lambda = 0.025;

var est = mlContext.Recommendation().Trainers.MatrixFactorization(options);
  1. CreateTextReader of TextLoader Class is removed. Read the data using ReadFromTextFile method. a. Error : CS1061 'DataOperationsCatalog' does not contain a definition for 'CreateTextReader' and no accessible extension method 'CreateTextReader' accepting a first argument of type 'DataOperationsCatalog' could be found b. Fix: Use ReadFromTextFile method

  2. 'MulticlassClassificationContext' is moved to MulticlassClassificationCatalog a. Error : CS0246 The type or namespace name 'MulticlassClassificationContext' could not be found (are you missing a using directive or an assembly reference?)
    b. Fix: Change 'MulticlassClassificationContext' to MulticlassClassificationCatalog

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