Autocorrelation

[ekvdg]

This implements new metafeatures including autocorrelation, cardinality at 2,3,4, and binary features. It also updates the way that numeric and categorical cardinalities are being calculated.

[bjschoenfeld]

The cardinalities in the metafeatures.json and the code that computes them need to be cleaned up. I want to fix this after the refactor that is coming soon. Also, I want to separate this from the autocorrelation PR. I will make a separate PR for each.

[epeters3]

As requested @bjschoenfeld, I've fixed and cleaned up this PR. It should be ready for your review now.

[codecov-io]

Codecov Report

Merging #160 into develop will decrease coverage by 0.23%.
The diff coverage is 89.18%.

@@             Coverage Diff             @@
##           develop     #160      +/-   ##
===========================================
- Coverage    92.36%   92.13%   -0.24%     
===========================================
  Files           13       13              
  Lines          760      788      +28     
===========================================
+ Hits           702      726      +24     
- Misses          58       62       +4

Impacted Files	Coverage Δ
metalearn/metafeatures/metafeatures.py	95.87% <100%> (+0.03%)	⬆️
metalearn/metafeatures/simple_metafeatures.py	100% <100%> (ø)	⬆️
metalearn/metafeatures/statistical_metafeatures.py	55% <66.66%> (+1.59%)	⬆️

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