Update datasets.py

[chenpnn]

support negative coef_

[codecov]

Codecov Report

Merging #441 (e648661) into master (4ff8560) will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #441      +/-   ##
==========================================
- Coverage   95.85%   95.65%   -0.21%     
==========================================
  Files          29       20       -9     
  Lines        3115     2026    -1089     
==========================================
- Hits         2986     1938    -1048     
+ Misses        129       88      -41     

Flag	Coverage Δ
Python	?
rpackage	95.65% <ø> (ø)

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Impacted Files	Coverage Δ
python/abess/datasets.py
python/abess/metrics.py
python/abess/functions.py
python/abess/__init__.py
python/abess/pca.py
python/abess/utilities.py
python/abess/linear.py
python/abess/bess_base.py
python/abess/decomposition.py

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