Rafa questions

Rafa answers

• LightGbm: how to use eval_sample_weight
• The default evaluation metric used with the objective 'binary:logistic' was changed from 'error' to 'logloss'
• Python xgb.cv use multiple evalation metrics
• python pandas "groupby" and "if any" condition
• Scipy or bayesian optimize function with constraints, bounds and dataframe in python