Experimental Feature - Accelerated NumPy

[gavincyi]

The change is to allow user to switch NumPy to other alternatives which can be run on GPU / TPU instances.

[codecov]

Codecov Report

Patch coverage: 87.70% and project coverage change: -0.01 ⚠️

Comparison is base (6bf7e77) 99.43% compared to head (9f75b8e) 99.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #672      +/-   ##
==========================================
- Coverage   99.43%   99.42%   -0.01%     
==========================================
  Files          74       77       +3     
  Lines       15480    15608     +128     
  Branches     2084     2114      +30     
==========================================
+ Hits        15393    15519     +126     
+ Misses         63       58       -5     
- Partials       24       31       +7     

Impacted Files	Coverage Δ
arch/experimental/engine.py	75.40% <75.40%> (ø)
arch/covariance/kernel.py	100.00% <100.00%> (ø)
arch/experimental/__init__.py	100.00% <100.00%> (ø)
arch/tests/experimental/test_engine.py	100.00% <100.00%> (ø)
arch/tests/test_examples.py	100.00% <100.00%> (ø)
arch/unitroot/unitroot.py	99.86% <100.00%> (+<0.01%)	⬆️

... and 3 files with indirect coverage changes

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