Abstract: During a normal condition of a braking control device, a first instruction unit gives instructions of braking force to be applied to a first wheel and a third wheel, and a second instruction unit gives instructions of braking force to be applied to a second wheel and a fourth wheel. When a failure occurs in the first instruction unit and the first instruction unit can no longer give the instructions of the braking force to be applied to the first wheel and the third wheel, the second instruction unit takes over the task of giving the instruction of braking force to be applied to the first wheel, and a third instruction unit takes over the task of giving the instruction of braking force to be applied to the third wheel.

Abstract: A data dimensionality reduction method includes: a step of dimensionally reducing a group of data from a high-dimensional space to a low-dimensional space using a distance function that defines a distance between any two vectors in the high-dimensional space; a step of dividing the dimensionally-reduced low-dimensional space into multiple subspaces; an analysis step of performing a regression analysis using a regression model based on at least one belonging data for each divided subspace; and a step of updating p first parameters included in the distance function based on results of the regression analysis in the multiple subspaces.