* added additional arguments estimate, base and sample_weights to fit_ensemble_and_extract_expressions function to use more than AdaBoost * added decision tree functions to __init__.py
0.1.24
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* added sumif and improved tolerance functionality
0.1.23
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* added nested conditions in functions
0.1.22
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* added tolerance functionality for !=, <, <=, > and >= * updated docs
0.1.21
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* changed sum to nansum * added tolerance functionality for ==