Features/347 average

[ClaudiaComito]

Description

Addresses Issue #347

Unlike mean(), average() allows to calculate a weighted average of a tensor, or along a specific axis.

The implementation is equivalent to numpy.average().

Averaging across multiple axes (axis is tuple) not supported yet (see Issue #351)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Have you handled and tested all split configurations?
Yes.

[codecov-io]

Codecov Report

Merging #352 into master will increase coverage by 0.03%.
The diff coverage is 99.25%.

@@            Coverage Diff             @@
##           master     #352      +/-   ##
==========================================
+ Coverage   96.96%   96.99%   +0.03%     
==========================================
  Files          53       53              
  Lines        8917     9051     +134     
==========================================
+ Hits         8646     8779     +133     
- Misses        271      272       +1

Impacted Files	Coverage Δ
heat/core/dndarray.py	95.37% <100%> (+0.01%)	⬆️
heat/core/tests/test_statistics.py	100% <100%> (ø)	⬆️
heat/core/statistics.py	96.66% <97.72%> (+0.13%)	⬆️

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