Cpu count fix

[rwedge]

Addresses #174

[codecov-io]

Codecov Report

Merging #176 into master will not change coverage.
The diff coverage is 60%.

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          69       69           
  Lines        7623     7623           
=======================================
  Hits         7079     7079           
  Misses        544      544

Impacted Files	Coverage Δ
...utational_backend/test_calculate_feature_matrix.py	99.61% <60%> (ø)	⬆️
...computational_backends/calculate_feature_matrix.py	94.19% <60%> (ø)	⬆️

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[kmax12]

Looks good. Merging