Since we fit the LogisticRegression object on a multiclass dataset, it uses the One-versus-Rest (OvR) approach by default, where the first intercept belongs to the model that fits class 1 versus class 2 and 3, the second value is the intercept of the model that fits class 2 versus class 1 and 3, and the third value is the intercept of the model that fits class 3 versus class 1 and 2:
