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scikit-learn is a popular machine learning package for Python that has simple and efficient tools for predictive data analysis. Topics include classification, regression, clustering, dimensionality reduction, model selection, and preprocessing.

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Machine Learning: Predicting target based on a feature

One quick thought is to use 1-NN (k-Nearest-Neighbors with k=1). This does not need any training (it is a lazy algorithm) and for each new sample you look up what is the nearest datapoint in your data …
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