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Additions to the imblearn package

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Additions to the imbalanced-learn package.

from imbutil.combine import MinMaxRandomSampler; from imblearn import pipeline;
# oversampling minority classes to 100 and undersampling majority classes to 800
sampler = MinMaxRandomSampler(min_freq=100, max_freq=800)
sampling_clf = pipeline.make_pipeline(sampler, inner_clf)

1 Installation

pip install imbutil

Additionally, the MinMaxRandomSampler, in addition to RandomUnderSampler and RandomOverSampler from imbalanced-learn, can technically be used with non-numeric data. However, the current implementation of imbalanced-learn forces a check for numeric data for all samplers. If you want to bypass this limitation, I have a fork of the project which does not force data to be numeric. You can install it with:

pip install git+

2 Basic Use

imbutil additions addhere to the structure of the imblearn package:

2.1 combine

Containes samplers that both under-sample and over-sample:

MinMaxRandomSampler - Random samples data to bring all class frequencies into a range.

3 Contributing

Package author and current maintainer is Shay Palachy (; You are more than welcome to approach him for help. Contributions are very welcomed.

3.1 Installing for development


git clone

Install in development mode, and with test dependencies:

cd imbutil
pip install -e ".[test]"

3.2 Running the tests

To run the tests use:

cd imbutil

3.3 Adding documentation

The project is documented using the numpy docstring conventions, which were chosen as they are perhaps the most widely-spread conventions that are both supported by common tools such as Sphinx and result in human-readable docstrings. When documenting code you add to this project, follow these conventions.

Additionally, if you update this README.rst file, use python checkdocs to validate it compiles.

4 Credits

Created by Shay Palachy (

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