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We study the problem of inferring this interaction kernel from observations of the positions of the particles, in either continuous or discrete time, along multiple independent trajectories. We introduce a nonparametric inference approach to this inverse problem, based on a regularized maximum likelihood estimator constrained to suitable hypothesis spaces adaptive to data. We show that a coercivity condition enables us to control the condition number of this problem and prove the consistency of our estimator, and that in fact it converges at a near-optimal learning rate, equal to the min\u2013max rate of one-dimensional nonparametric regression. In particular, this rate is independent of the dimension of the state space, which is typically very high. We also analyze the discretization errors in the case of discrete-time observations, showing that it is of order 1\/2 in terms of the time spacings between observations. This term, when large, dominates the sampling error and the approximation error, preventing convergence of the estimator. Finally, we exhibit an efficient parallel algorithm to construct the estimator from data, and we demonstrate the effectiveness of our algorithm with numerical tests on prototype systems including stochastic opinion dynamics and a Lennard-Jones model.<\/jats:p>","DOI":"10.1007\/s10208-021-09521-z","type":"journal-article","created":{"date-parts":[[2021,7,13]],"date-time":"2021-07-13T20:02:30Z","timestamp":1626206550000},"page":"1013-1067","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Learning Interaction Kernels in Stochastic Systems of Interacting Particles from Multiple Trajectories"],"prefix":"10.1007","volume":"22","author":[{"given":"Fei","family":"Lu","sequence":"first","affiliation":[]},{"given":"Mauro","family":"Maggioni","sequence":"additional","affiliation":[]},{"given":"Sui","family":"Tang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,7,13]]},"reference":[{"issue":"42","key":"9521_CR1","doi-asserted-by":"publisher","first-page":"20828","DOI":"10.1073\/pnas.1908065116","volume":"116","author":"AS Baumgarten","year":"2019","unstructured":"A.\u00a0S. 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