Bug/1004 0-dimensional singleton arrays

[neosunhan]

Description

Return 0-dimensional (instead of 1-dimensional) singleton arrays for several functions.

Issue/s resolved: #1004

Changes proposed:

• Remove flattening step after partial reduction operation for 0-dimensional arrays

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Due Diligence

• [ ] All split configurations tested
• [ ] Multiple dtypes tested in relevant functions
• [ ] Documentation updated (if needed)
• [ ] Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

yes

• all
• any
• prod
• sum
• argmax
• argmin
• max
• mean
• min
• std
• var

skip ci

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[github-actions[bot]]

Thank you for the PR!

[codecov[bot]]

Codecov Report

Merging #1005 (6be8b4c) into main (7830d74) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
+ Coverage   92.16%   92.19%   +0.03%     
==========================================
  Files          75       75              
  Lines       10708    10699       -9     
==========================================
- Hits         9869     9864       -5     
+ Misses        839      835       -4     

Flag	Coverage Δ
unit	92.19% <100.00%> (+0.03%)	:arrow_up:

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

Files Changed	Coverage Δ
heat/core/_operations.py	96.11% <100.00%> (+0.06%)	:arrow_up:
heat/core/sanitation.py	98.38% <100.00%> (+1.32%)	:arrow_up:
heat/core/tests/test_suites/basic_test.py	98.07% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[github-actions[bot]]

Thank you for the PR!