Fix LightGBM Ranking sample runtime exception. (dotnet#3257)

codemzs · web-flow · commit 36cad6788d37 · 2019-04-09T10:38:49.000-07:00
diff --git a/docs/samples/Microsoft.ML.Samples/Dynamic/Trainers/Ranking/LightGbmWithOptions.cs b/docs/samples/Microsoft.ML.Samples/Dynamic/Trainers/Ranking/LightGbmWithOptions.cs
@@ -29,7 +29,8 @@ public static void Example()
                     Booster = new GradientBooster.Options
                     {
                         FeatureFraction = 0.9
-                    }
+                    },
+                    RowGroupColumnName = "GroupId"
                 });
 
             // Fit this pipeline to the training Data.
@@ -43,7 +44,7 @@ public static void Example()
 
             // Expected output:
             //   DCG: @1:1.71, @2:3.88, @3:7.93
-            //   NDCG: @1:7.98, @2:12.14, @3:16.62
+            //   NDCG: @1:0.08, @2:0.12, @3:0.17
         }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,8 @@ public static void Example()`
`29`	`29`	`Booster = new GradientBooster.Options`
`30`	`30`	`{`
`31`	`31`	`FeatureFraction = 0.9`
`32`		`- }`
	`32`	`+ },`
	`33`	`+ RowGroupColumnName = "GroupId"`
`33`	`34`	`});`
`34`	`35`
`35`	`36`	`// Fit this pipeline to the training Data.`
`@@ -43,7 +44,7 @@ public static void Example()`
`43`	`44`
`44`	`45`	`// Expected output:`
`45`	`46`	`// DCG: @1:1.71, @2:3.88, @3:7.93`
`46`		`- // NDCG: @1:7.98, @2:12.14, @3:16.62`
	`47`	`+ // NDCG: @1:0.08, @2:0.12, @3:0.17`
`47`	`48`	`}`
`48`	`49`	`}`
`49`	`50`	`}`