code: def _fprime(score, x_full, k_params, alpha):
      """
      The regularized derivative
      """
      x_params = x_full[:k_params]
      # The derivative just appends a vector of constants
      return np.append(score(x_params), alpha)
  
file_path: statsmodels/statsmodels/base/l1_slsqp.py
imports: import numpy
  from scipy.optimize import fmin_slsqp
  import statsmodels.base.l1_solvers_common
label_desc: Use image node_id 4 for calling a global function with example usage: _fprime(score, x_full, k_params, alpha) and returns: np