Pascal Massart coauthored concentration bounds for self-bounding functions with Stéphane Boucheron and Gábor Lugosi. Their entropy method (probability) analysis derives Bernstein-type concentration inequalities from restrictions on how much one coordinate can change a function. The work also recovers Talagrand's convex distance inequality.[ref]
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Pascal Massart could refer to a few different things, but in the context of notable figures, it is likely referencing a French statistician known for his contributions to the field of statistics, particularly in nonparametric statistics and empirical processes. He has authored various papers and books on statistical theory.