Metadata-Version: 2.1
Name: skippa
Version: 0.1.3
Summary: SciKIt-learn Pre-processing Pipeline in PAndas
Home-page: https://github.com/data-science-lab-amsterdam/skippa
Author: Robert van Straalen
Author-email: tech@datasciencelab.nl
License: UNKNOWN
Description: ![pypi](https://img.shields.io/pypi/v/skippa)
        ![](https://img.shields.io/pypi/pyversions/skippa)
        
        
        # Skippa 
        :kangaroo: easy hopping
        
        SciKIt-learn Pipeline in PAndas
        
        Want to create a machine learning model using pandas & scikit-learn? This should make your life easier.
        
        Skippa helps you to easily create a pre-processing and modeling pipeline, based on scikit-learn transformers but preserving pandas dataframe format throughout all pre-processing. This makes it a lot easier to define a series of subsequent transformation steps, while referring to columns in your intermediate dataframe.
        
        So basically the same idea as `scikit-pandas`, but a different (and hopefully better) way to achieve it.
        
        ## Installation
        ```
        pip install skippa
        ```
        
        ## Basic usage
        
        Import `Skippa` class and `columns` helper function
        ```
        import numpy as np
        import pandas as pd
        from sklearn.linear_model import LogisticRegression
        
        from skippa import Skippa, columns
        ```
        
        Get some data
        ```
        df = pd.DataFrame({
            'q': [0, 0, 0],
            'date': ['2021-11-29', '2021-12-01', '2021-12-03'],
            'x': ['a', 'b', 'c'],
            'x2': ['m', 'n', 'm'],
            'y': [1, 16, 1000],
            'z': [0.4, None, 8.7]
        })
        y = np.array([0, 0, 1])
        ```
        
        Define your pipeline:
        ```
        pipe = (
            Skippa()
                .select(columns(['x', 'x2', 'y', 'z']))
                .cast(columns(['x', 'x2']), 'category')
                .impute(columns(dtype_include='number'), strategy='median')
                .impute(columns(dtype_include='category'), strategy='most_frequent')
                .scale(columns(dtype_include='number'), type='standard')
                .onehot(columns(['x', 'x2']))
                .model(LogisticRegression())
        )
        ```
        
        and use it for fitting / predicting like this:
        ```
        pipe.fit(X=df, y=y)
        
        predictions = pipe.predict_proba(df)
        ```
        
        If you want details on your model, use:
        ```
        model = pipe.get_model()
        print(model.coef_)
        print(model.intercept_)
        ```
        
        ## (de)serialization
        And of course you can save and load your model pipelines (for deployment).
        N.B. [`dill`](https://pypi.org/project/dill/) is used for ser/de because joblib and pickle don't provide enough support.
        ```
        pipe.save('./models/my_skippa_model_pipeline.dill')
        
        ...
        
        my_pipeline = Skippa.load_pipeline('./models/my_skippa_model_pipeline.dill')
        predictions = my_pipeline.predict(df_new_data)
        ```
        
        See [./examples](./examples) for more examples.
        
        ## To Do
        - [x] Support pandas assign for creating new columns based on existing columns
        - [x] Support cast / astype transformer
        - [x] Support for .apply transformer: wrapper around `pandas.DataFrame.apply`
        - [ ] fit-transform does lazy evaluation > cast to category and then selecting category columns doesn't work > each fit/transform should work on the expected output state of the previous transformer, rather than on the original dataframe
        - [ ] Investigate if Skippa can directly extend sklearn's Pipeline
        - [ ] Validation of pipeline steps
        - [ ] Input validation in transformers
        - [ ] Check how GridSearch (or other param search) works with Skippa
        - [ ] Transformer for replacing values (pandas .replace)
        - [ ] Support arbitrary transformer (if column-preserving)
        - [ ] Eliminate the need to call columns explicitly
        - [ ] Add more transformations
        
        
        ## Credits
        
        This package was created with [Cookiecutter](https://github.com/audreyr/cookiecutter) and the [`audreyr/cookiecutter-pypackage`](https://github.com/audreyr/cookiecutter-pypackage) project template.
        
        
        # History
        
        ## 0.1.3 (2021-12-10)
        - Added `.apply()` transformer for `pandas.DataFrame.apply()` functionality
        - Documentation and examples update
        
        ## 0.1.2 (2021-11-28)
        - Added `.assign()` transformer for `pandas.DataFrame.assign()` functionality
        - Added `.cast()` transformer (with aliases `.astype()` & `.as_type()`) for `pandas.DataFrame.astype` functionality
        
        ## 0.1.1 (2021-11-22)
        - Fixes and documentation.
        
        ## 0.1.0 (2021-11-19)
        - First release on PyPI.
        
Keywords: preprocessing pipeline pandas sklearn
Platform: UNKNOWN
Classifier: Development Status :: 2 - Pre-Alpha
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Requires-Python: >=3.7
Description-Content-Type: text/markdown
