code: def garch_cons(x0):
      # Constraints for GARCH model
      # alpha+beta < 1
      return 1 - (x0[1:].sum())
  
file_path: statsforecast/statsforecast/garch.py
imports: import numpy
  from numba import njit
  from scipy.optimize import minimize
  from .utils import CACHE, NOGIL
label_desc: Use image node_id 3 for calling a global function with example usage: garch_cons(x0) and returns: unknown