Bug fix: exception need throw

[feiyun0112]

No description provided.

[michaelgsharp]

LGTM

[codecov]

Codecov Report

Merging #5823 (26b348e) into main (7c34ab9) will increase coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #5823      +/-   ##
==========================================
+ Coverage   68.37%   68.40%   +0.02%     
==========================================
  Files        1131     1134       +3     
  Lines      241291   241937     +646     
  Branches    25053    25112      +59     
==========================================
+ Hits       164993   165502     +509     
- Misses      69806    69917     +111     
- Partials     6492     6518      +26     

Flag	Coverage Δ
Debug	68.40% <33.33%> (+0.02%)	⬆️
production	62.99% <33.33%> (-0.01%)	⬇️
test	89.29% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Microsoft.ML.TensorFlow/TensorflowUtils.cs	72.92% <0.00%> (+6.62%)	⬆️
src/Microsoft.ML.Vision/DnnRetrainTransform.cs	60.88% <0.00%> (ø)
src/Microsoft.ML.TensorFlow/TensorflowTransform.cs	84.70% <100.00%> (+5.22%)	⬆️
...osoft.ML.KMeansClustering/KMeansPlusPlusTrainer.cs	83.60% <0.00%> (-7.16%)	⬇️
src/Microsoft.ML.Data/Training/TrainerUtils.cs	65.86% <0.00%> (-3.82%)	⬇️
...crosoft.ML.StandardTrainers/Standard/SdcaBinary.cs	85.49% <0.00%> (-3.08%)	⬇️
src/Microsoft.ML.Sweeper/AsyncSweeper.cs	71.42% <0.00%> (-1.37%)	⬇️
...crosoft.ML.StandardTrainers/Optimizer/Optimizer.cs	71.96% <0.00%> (-1.16%)	⬇️
...oft.ML.StandardTrainers/Standard/SdcaMulticlass.cs	91.46% <0.00%> (-1.03%)	⬇️
src/Microsoft.Data.Analysis/GroupBy.cs	97.68% <0.00%> (-0.81%)	⬇️
... and 30 more