Adding vector tests for KeyToValue and ValueToKey

[Lynx1820]

No description provided.

[codecov]

Codecov Report

Merging #5090 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5090      +/-   ##
==========================================
- Coverage   75.66%   75.65%   -0.01%     
==========================================
  Files         993      993              
  Lines      178168   178170       +2     
  Branches    19122    19126       +4     
==========================================
- Hits       134802   134799       -3     
- Misses      38143    38146       +3     
- Partials     5223     5225       +2     

Flag	Coverage Δ
#Debug	75.65% <100.00%> (-0.01%)	⬇️
#production	71.62% <100.00%> (-0.01%)	⬇️
#test	88.68% <100.00%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
src/Microsoft.ML.Data/Transforms/KeyToValue.cs	81.86% <100.00%> (+0.04%)	⬆️
...ML.Data/Transforms/ValueToKeyMappingTransformer.cs	80.65% <100.00%> (+0.06%)	⬆️
test/Microsoft.ML.Tests/OnnxConversionTest.cs	99.29% <100.00%> (+<0.01%)	⬆️
test/Microsoft.ML.Tests/DatabaseLoaderTests.cs	91.17% <0.00%> (-2.91%)	⬇️
...L.AutoML/TrainerExtensions/TrainerExtensionUtil.cs	85.15% <0.00%> (-1.75%)	⬇️
...soft.ML.Transforms/Text/WordEmbeddingsExtractor.cs	86.39% <0.00%> (-1.14%)	⬇️
.../Microsoft.ML.Data/DataLoadSave/Text/TextLoader.cs	82.09% <0.00%> (-0.12%)	⬇️
test/Microsoft.ML.TestFrameworkCommon/Datasets.cs	100.00% <0.00%> (ø)
...soft.ML.Data/DataLoadSave/Text/TextLoaderCursor.cs	89.13% <0.00%> (+0.20%)	⬆️
test/Microsoft.ML.Tests/TextLoaderTests.cs	96.08% <0.00%> (+0.54%)	⬆️
... and 2 more

[harishsk]

        {

nit: Please add a newline above.

But more importantly, ValueToKeyMapping (and related) transforms have caused a bunch of issues in Nimbus. Can you please run the Nimbus suite of tests and make sure that nothing is broken there as a result of these changes? #Resolved

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Refers to: src/Microsoft.ML.Data/Transforms/ValueToKeyMappingTransformer.cs:813 in ebea3a0. [](commit_id = ebea3a0, deletion_comment = False)