Update eval.py, fix a minor bug #1
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Dividing by an additional N does not affect the trend of the curve, but it makes the Adjusted Qini and Cgain curves very similar on data where the control and treatment groups are relatively evenly distributed (after sorted by uplift value), making the two curves difficult to distinguish and prone to misunderstanding.
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Dividing by an additional N does not affect the trend of the curve, but it makes the Adjusted Qini and Cgain curves very similar on data where the control and treatment groups are relatively evenly distributed (after sorted by uplift value), making the two curves difficult to distinguish and prone to misunderstanding.