Skip zero means and std deviations in transforms #403
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Updated transformations to skip columns with zero means or standard deviations.
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If min(a) = max(a), then min_max scaling of column a will map it to all NaN, which may cause subsequent issues in models.
Keeping a column of constant is better than running into errors in modelling.
To avoid that, we can drop such expressions once we learn the min, max.
The same for standard transform when std = 0.