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• W2793371569 abstract "This article describes an unsupervised machine learning method for computing distributed vector representation of molecular fragments. These vectors encode fragment features in a continuous high-dimensional space and enable similarity computation between individual fragments, even for small fragments with only two heavy atoms. The method is based on a word embedding algorithm borrowed from natural language processing field, and approximately 6 million unlabeled PubChem chemicals were used for training. The resulting dense fragment vectors are in contrast to the traditional sparse “one-hot” fragment representation and capture rich relational structure in the fragment space. The vectors of small linear fragments were averaged to yield distributed vectors of bigger fragments and molecules, which were used for different tasks, e.g., clustering, ligand recall, and quantitative structure–activity relationship modeling. The distributed vectors were found to be better at clustering ring systems and recall of kinase ligands as compared to standard binary fingerprints. This work demonstrates unsupervised learning of fragment chemistry from large sets of unlabeled chemical structures and subsequent application to supervised training on relatively small data sets of labeled chemicals." @default.
• W2793371569 created "2018-03-29" @default.
• W2793371569 creator A5006751935 @default.
• W2793371569 date "2018-03-08" @default.
• W2793371569 modified "2023-09-26" @default.
• W2793371569 title "Distributed Representation of Chemical Fragments" @default.
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• W2793371569 doi "https://doi.org/10.1021/acsomega.7b02045" @default.
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