ImageClassificationTrainer PredictedLabelColumnName bug when the name is not default (#7458)

* set PredictedLabelColumnName

* Update src/Microsoft.ML.Data/Scorers/PredictedLabelScorerBase.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: feiyun0112 <feiyun0112@hotmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

src/Microsoft.ML.Data/Scorers/PredictedLabelScorerBase.cs

@@ -38,6 +38,11 @@ private protected sealed class BindingsImpl : BindingsBase
             public readonly int ScoreColumnIndex;
             // The type of the derived column.
             public readonly DataViewType PredColType;
+            /// <summary>
+            /// The name of the column that contains the predicted labels.
+            /// This field is used in the scoring process to store or reference the predicted label column.
+            /// </summary>
+            public readonly string PredictedLabelColumnName;
             // The ScoreColumnKind metadata value for all score columns.
             public readonly string ScoreColumnKind;
 
@@ -54,6 +59,7 @@ private BindingsImpl(DataViewSchema input, ISchemaBoundRowMapper mapper, string
                 ScoreColumnIndex = scoreColIndex;
                 ScoreColumnKind = scoreColumnKind;
                 PredColType = predColType;
+                PredictedLabelColumnName = predictedLabelColumnName;
 
                 _getScoreColumnKind = GetScoreColumnKind;
                 _getScoreValueKind = GetScoreValueKind;
@@ -113,7 +119,7 @@ public BindingsImpl ApplyToSchema(DataViewSchema input, ISchemaBindableMapper bi
                 bool tmp = rowMapper.OutputSchema.TryGetColumnIndex(scoreCol, out mapperScoreColumn);
                 env.Check(tmp, "Mapper doesn't have expected score column");
 
-                return new BindingsImpl(input, rowMapper, Suffix, ScoreColumnKind, true, mapperScoreColumn, PredColType);
+                return new BindingsImpl(input, rowMapper, Suffix, ScoreColumnKind, true, mapperScoreColumn, PredColType, PredictedLabelColumnName);
             }
 
             public static BindingsImpl Create(ModelLoadContext ctx, DataViewSchema input,