Remove IMetaLinearTrainer

Author: Tom Finley

src/Microsoft.ML.Core/Prediction/ITrainer.cs

@@ -101,12 +101,4 @@ public interface IModelCombiner<TModel, TPredictor>
     {
         TPredictor CombineModels(IEnumerable<TModel> models);
     }
-
-    /// <summary>
-    /// Interface implemented by the MetalinearLearners base class.
-    /// Used to distinguish the MetaLinear Learners from the other learners
-    /// </summary>
-    public interface IMetaLinearTrainer
-    {
-    }
 }

src/Microsoft.ML.PipelineInference/ExperimentsGenerator.cs

@@ -110,8 +110,7 @@ public static List<Sweep> GenerateCandidates(IHostEnvironment env, string dataFi
 
             //get all the trainers for this task, and generate the initial set of candidates.
             // Exclude the hidden learners, and the metalinear learners. 
-            var trainers = ComponentCatalog.GetAllDerivedClasses(typeof(ITrainer), predictorType)
-                .Where(cls => !cls.IsHidden && !typeof(IMetaLinearTrainer).IsAssignableFrom(cls.Type));
+            var trainers = ComponentCatalog.GetAllDerivedClasses(typeof(ITrainer), predictorType).Where(cls => !cls.IsHidden);
 
             var loaderSubComponent = new SubComponent("TextLoader", loaderSettings);
             string loader = $" loader={loaderSubComponent}";