code: def der(self, coords):
      x, y = coords
      dfdx = 2.0 * (x + 2.0 * y - 7.0) + 4.0 * (2.0 * x + y - 5.0)
      dfdy = 4.0 * (x + 2.0 * y - 7.0) + 2.0 * (2.0 * x + y - 5.0)
      return np.array([dfdx, dfdy])
  
imports: import time
  import numpy
  from numpy import sin, cos, pi, exp, sqrt, abs
  from scipy.optimize import rosen
label_desc: Use image node_id 2 for calling the Booth obj's underlying member method code with example usage: obj.der(coords) and returns: np