`scipy.optimize._lsq.common:find_active_constraints`

Signature

def find_active_constraints(x, lb, ub, rtol = 1e-10)

Determine which constraints are active in a given point.

The threshold is computed using rtol and the absolute value of the closest bound.

active : ndarray of int with shape of x

Each component shows whether the corresponding constraint is active:

0 - a constraint is not active.
-1 - a lower bound is active.
1 - an upper bound is active.