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pandas dataframe columns scaling with sklearn
...ansform(dfTest[['A','B']].to_numpy())
dfTest
A B C
0 -1.995290 -1.571117 big
1 0.436356 -0.603995 small
2 0.460289 0.100818 big
3 0.630058 0.985826 small
4 0.468586 1.088469 small
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