added jitting to torch skew and kurtosis

[coquelin77]

Description

jitting for skew and kurtosis. possibly more changes to come here, this is the branch to be used during benchmarking and testing of the moment functions

Changes proposed:

• jit the torch skew and torch kurtosis functions

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Due Diligence

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

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

no

[codecov[bot]]

Codecov Report

Merging #642 (acdecf4) into main (bc99e60) will decrease coverage by 87.69%. The diff coverage is 6.96%.

@@            Coverage Diff             @@
##             main    #642       +/-   ##
==========================================
- Coverage   97.47%   9.78%   -87.70%     
==========================================
  Files          87      87               
  Lines       17182   17386      +204     
==========================================
- Hits        16748    1701    -15047     
- Misses        434   15685    +15251     

Flag	Coverage Δ
gpu	9.78% <6.96%> (?)

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

Impacted Files	Coverage Δ
heat/core/tests/test_statistics.py	2.35% <0.00%> (-97.65%)	:arrow_down:
heat/core/statistics.py	6.40% <6.30%> (-90.62%)	:arrow_down:
heat/core/dndarray.py	24.80% <66.66%> (-71.95%)	:arrow_down:
heat/core/linalg/tests/test_basics.py	1.75% <0.00%> (-98.25%)	:arrow_down:
heat/core/tests/test_manipulations.py	2.01% <0.00%> (-97.92%)	:arrow_down:
heat/core/tests/test_factories.py	2.73% <0.00%> (-97.27%)	:arrow_down:
heat/core/linalg/qr.py	2.84% <0.00%> (-96.45%)	:arrow_down:
heat/core/tests/test_tiling.py	3.83% <0.00%> (-96.17%)	:arrow_down:
heat/core/tests/test_random.py	3.85% <0.00%> (-96.15%)	:arrow_down:
heat/core/tests/test_dndarray.py	4.11% <0.00%> (-95.89%)	:arrow_down:
... and 69 more

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[coquelin77]

about 54 lines are expected misses due to jitting + extreme corner cases that are beyond the scope of unit tests (implemented for SF and TS matrices on a larger test system). the code controlling this case is tested in the mean unit tests as it is the case which requires the least overhead

with these lines added the patch coverage would increase to about 95%.

[coquelin77]

ive picked this back up, but im not sure about how long this will take. this branch was very very stale.

...it was still tested on travis...

[ClaudiaComito]

Closing this as it is very outdated. Happy to reopen if @coquelin77 wants to refresh it. Thanks for all the work!