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I cloned the project and while I was integrating the model with some other data pipeline I noticed there were no tests for the data_processor.py module.
I needed tests and also more specific docstrings about every method to ease the integration process with different data sources and data pipelines. This pull request is simply an addition of docstrings for all methods of data_processor.py and a new module test_data_processor.py wrote with unittest for unit testing data_processor.py. It could turn out to be useful for others that want to integrate this project with some other system and want to do proper integration testing.