Machine learning has proved to be a useful tool for extracting knowledge from scientific data in numerous research fields, including astrophysics, genomics, and molecular dynamics. Often, data sets from these research areas need to be processed in distributed platforms due to their magnitude. This can be done using one of the various distributed machine learning libraries available. One of these libraries is dislib, a distributed machine learning library for Python especially designed to process large scale data sets on HPC clusters, which makes dislib an ideal candidate for analyzing scientific data. However, dislibs main distributed data structure, called Dataset, has some limitations, including poor performance in certain operations and low flexibility and usability. In this paper, we propose a novel distributed data structure for dislib, called ds-array, that addresses dislibs main limitations in data management. Ds-arrays simplify distributed data management in dislib by exposing a NumPy-like API, provide more flexibility, and reduce the computational complexity of some operations. This results in performance improvements of up to two orders of magnitude over Datasets, while also greatly improving scalability and usability.
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