fix dataset explorer plot with count not displaying

[imatiach-msft]

Description

Fixed issue #1453 where count plot is not displaying.

The main problem was that count uses "none" as the metadata name, which does not have any sorted categorical values (see

responsible-ai-toolbox/libs/core-ui/src/lib/util/JointDataset.ts

Line 739 in bc7a9f9

treatAsCategorical: true

which sets treatAsCategorical=True, but does not specify categorical values). However, when creating the highchart options, we skip the step to pass the values of the "none" group, since we iterate over all categorical values. There are several possible fixes here (another I had was to insert an array with some dummy "count" value for the categoricals values in JointDataset which also worked), but I felt this was the least intrusive and safest one.

Screenshot of fixed plot:

Checklist

• I have added screenshots above for all UI changes.
• Documentation was updated if it was needed.
• New tests were added or changes were manually verified.

[codecov-commenter]

Codecov Report

Merging #1454 (2e56401) into main (65ef440) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1454   +/-   ##
=======================================
  Coverage   89.34%   89.34%           
=======================================
  Files          80       80           
  Lines        3556     3556           
=======================================
  Hits         3177     3177           
  Misses        379      379           

Flag	Coverage Δ
unittests	89.34% <ø> (ø)

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-count-plot/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-count-plot/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-count-plot/dashboard/index.html

[romanlutz]

In the screenshot I don't see none showing up. What am I missing? [Note: I don't mean to hold this up at all. Feel free to proceed in any case.]

[tongyu-microsoft]

In the screenshot I don't see none showing up. What am I missing? [Note: I don't mean to hold this up at all. Feel free to proceed in any case.]

@romanlutz, I checked that locally, the none shows up in the pop up when you hover over each column in the chart. For other y-axis choices like categorical features, we are displaying apple: 5, banana: 8. And for Ilya's change for count, we display none

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-count-plot/dashboard/index.html