Features/590 nbytes

[lenablind]

Description

Implementation of properties nbytes, gnbytes, lnbytes which return the memory consumed by the underlying tensor.
nbytes is equivalent to gnbytes, lnbytes refers to the local torch tensor.

Numpy analogue: https://numpy.org/doc/stable/reference/generated/numpy.ndarray.nbytes.html

Issue/s resolved: #590

Changes proposed:

• Introduction of properties nbytes, gnbytes, lnbytes
• Implementation of corresponding tests

Type of change

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

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?

no

[codecov]

Codecov Report

Merging #683 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #683      +/-   ##
==========================================
+ Coverage   97.46%   97.47%   +0.01%     
==========================================
  Files          87       87              
  Lines       17094    17182      +88     
==========================================
+ Hits        16660    16748      +88     
  Misses        434      434              

Impacted Files	Coverage Δ
heat/core/dndarray.py	96.74% <100.00%> (+0.02%)	⬆️
heat/core/tests/test_dndarray.py	100.00% <100.00%> (ø)

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