diff --git a/src/Microsoft.ML.Data/Prediction/CalibratorCatalog.cs b/src/Microsoft.ML.Data/Prediction/CalibratorCatalog.cs
index 00de4ee9c12..a1de8d2e5d2 100644
--- a/src/Microsoft.ML.Data/Prediction/CalibratorCatalog.cs
+++ b/src/Microsoft.ML.Data/Prediction/CalibratorCatalog.cs
@@ -204,7 +204,6 @@ private protected CalibratorTransformer(IHostEnvironment env, ModelLoadContext c
         string ISingleFeaturePredictionTransformer.FeatureColumnName => ((ISingleFeaturePredictionTransformer<TICalibrator>)this).FeatureColumnName;
 
         DataViewType ISingleFeaturePredictionTransformer<TICalibrator>.FeatureColumnType => NumberDataViewType.Single;
-        DataViewType ISingleFeaturePredictionTransformer.FeatureColumnType => ((ISingleFeaturePredictionTransformer<TICalibrator>)this).FeatureColumnType;
 
         TICalibrator IPredictionTransformer<TICalibrator>.Model => _calibrator;
 
diff --git a/src/Microsoft.ML.Data/Prediction/IPredictionTransformer.cs b/src/Microsoft.ML.Data/Prediction/IPredictionTransformer.cs
index e189ee69d82..fceb68ae07d 100644
--- a/src/Microsoft.ML.Data/Prediction/IPredictionTransformer.cs
+++ b/src/Microsoft.ML.Data/Prediction/IPredictionTransformer.cs
@@ -45,8 +45,5 @@ internal interface ISingleFeaturePredictionTransformer : ITransformer
     {
         /// <summary>The name of the feature column.</summary>
         string FeatureColumnName { get; }
-
-        /// <summary>Holds information about the type of the feature column.</summary>
-        DataViewType FeatureColumnType { get; }
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.ML.Transforms/PermutationFeatureImportanceExtensions.cs b/src/Microsoft.ML.Transforms/PermutationFeatureImportanceExtensions.cs
index 858de28d489..f3a0f4fa002 100644
--- a/src/Microsoft.ML.Transforms/PermutationFeatureImportanceExtensions.cs
+++ b/src/Microsoft.ML.Transforms/PermutationFeatureImportanceExtensions.cs
@@ -681,7 +681,7 @@ private static double[] ComputeSequenceDeltas(IReadOnlyList<double> a, IReadOnly
             env.CheckValue(lastTransformer, nameof(lastTransformer), "The model provided does not have a compatible predictor");
 
             string featureColumnName = lastTransformer.FeatureColumnName;
-            TryGetImplementedIPredictionTransformer(lastTransformer.GetType(), out var predictionTransformerGenericType);
+            var predictionTransformerGenericType = GetImplementedIPredictionTransformer(lastTransformer.GetType());
 
             Type[] types = { predictionTransformerGenericType.GenericTypeArguments[0], typeof(TMetric), typeof(TResult) };
             Type pfiGenericType = typeof(PermutationFeatureImportance<,,>).MakeGenericType(types);
@@ -721,19 +721,17 @@ private static double[] ComputeSequenceDeltas(IReadOnlyList<double> a, IReadOnly
             return output.ToImmutableDictionary();
         }
 
-        private static bool TryGetImplementedIPredictionTransformer(Type type, out Type interfaceType)
+        private static Type GetImplementedIPredictionTransformer(Type type)
         {
             foreach (Type iType in type.GetInterfaces())
             {
                 if (iType.IsGenericType && iType.GetGenericTypeDefinition() == typeof(IPredictionTransformer<>))
                 {
-                    interfaceType = iType;
-                    return true;
+                    return iType;
                 }
             }
 
-            interfaceType = null;
-            return false;
+            throw new ArgumentException($"Type IPredictionTransformer not implemented by provided type", nameof(type));
         }
 
         #endregion