* datetime feature engineering added.
* check if datetime in columns moved after drop check. Check if the new columns do not already exist.
* check the drop condition before to add new_column. In transform, check directly if new columns are present in num_column.
* check if new_column is in X.columns.
* fixed lint issue. update version to 0.4.1.
* v0.2.2
separate the HPO part into the module flaml.tune
enhanced implementation of FLOW^2, CFO and BlendSearch
support parallel tuning using ray tune
add support for sample_weight and generic fit arguments
enable mlflow logging
Co-authored-by: Chi Wang (MSR) <chiw@microsoft.com>
Co-authored-by: qingyun-wu <qw2ky@virginia.edu>