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Differential private machine learning workflow in R
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Overview of package

The diffPrivML package consists of a library of classifiers implemented as S3 classes, each with differential privacy supported using algorithms from published research.

  • DPNaiveBayesClassifier
  • DPRandomDecisionTreeClassifier
  • DPLogisticRegressionClassifier

For example, to fit a model of DPNaiveBayesClassifier, the privacy budget, epsilon, can be specified as part of the input like so.

naiveBayesDP <- DPNaiveBayesClassifier(y = classLabels, x = predictors, epsilon = 0.05)

The model is fitted with the input training data when the classifier object gets instantiated.

Each classifier in diffPrivML also has all the standard ML methods such as summary and predict(). So far, all the ML algorithms in this package uses output perturbation methods for enforcing differential privacy.

Background Information

Machine learning algorithms collectively strive to extract population information and learn general patterns from data sets. The output of machine learning algorithms are generally trained models, where raw data points are distiled to far more compact forms that capture the essence of the origninal data. It is a type of summary aggregation in short that is no different than COUNT and SUM.

The release of these trained machine learning models, however, comes with a cost--individual data privacy. Oftentimes, machine learning models inadvertently give away information on individual data points used in the training data, even though these ML models are meant to release population information only.

To analyze and potentially solve this problem, one unified framework proposed by Cynthia Dwork's paper is the $\epsilon$-differential private mechanism. This is a model that quantifies the degrees of privacy loss for a given data release system, and a tolerance level as a parameter--$\epsilon$. A lot of theoretical research has been done on different ML models with regards to differential privacy, such as these research here, but not enough efforts are being done to apply these in practice.

Therefore, we developed a R package, diffPrivML, that aims to put these differential private enhanced ML algorithms in the hands of data practitioners. Just like how a unified framework is developed to measure differential privacy, diffPrivML is a precursor in standardizing a library of ML algorithms and workflows that have differential privacy baked in. End users do not need to worry about HOW to perturb the data to release their models; the ML algorithm itself makes the guarantee.

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