concat feature columns addition

Author: kere-nel

src/Microsoft.ML.AutoML/TransformInference/TransformInference.cs

@@ -406,7 +406,7 @@ public static SuggestedTransform[] InferTransforms(MLContext context, TaskKind t
                 suggestedTransforms.AddRange(suggestions);
             }
 
-            if (task != TaskKind.Recommendation && task != TaskKind.Ranking)
+            if (task != TaskKind.Recommendation)
             {
                 var finalFeaturesConcatTransform = BuildFinalFeaturesConcatTransform(context, suggestedTransforms, intermediateCols);
                 if (finalFeaturesConcatTransform != null)
@@ -446,6 +446,10 @@ private static SuggestedTransform BuildFinalFeaturesConcatTransform(MLContext co
             var labelColumnName = intermediateCols.FirstOrDefault(c => c.Purpose == ColumnPurpose.Label)?.ColumnName;
             concatColNames.Remove(labelColumnName);
 
+            // remove column with 'GroupId' purpose
+            var groupColumnName = intermediateCols.FirstOrDefault(c => c.Purpose == ColumnPurpose.GroupId)?.ColumnName;
+            concatColNames.RemoveAll(s => s == groupColumnName);
+
             intermediateCols = intermediateCols.Where(c => c.Purpose == ColumnPurpose.NumericFeature ||
                 c.Purpose == ColumnPurpose.CategoricalFeature || c.Purpose == ColumnPurpose.TextFeature ||
                 c.Purpose == ColumnPurpose.ImagePath);

test/Microsoft.ML.CodeGenerator.Tests/ApprovalTests/ConsoleCodeGeneratorTests.cs

@@ -83,7 +83,6 @@ public void ConsoleAppModelBuilderCSFileContentRegressionTest()
             var result = consoleCodeGen.GenerateConsoleAppProjectContents(_namespaceValue, typeof(float), true, true,
                 false, false, false, false);
 
-
             Approvals.Verify(result.modelBuilderCSFileContent);
         }
 
@@ -540,7 +539,6 @@ private CodeGenerator PrepareForRecommendationTask()
         {
             if (_mockedPipeline == null)
             {
-
                 MLContext context = new MLContext();
                 // same learners with different hyperparams
                 var hyperparams1 = new Microsoft.ML.AutoML.ParameterSet(new List<Microsoft.ML.AutoML.IParameterValue>() { new LongParameterValue("NumLeaves", 2) });