code: def rosenbrock(x, a=1, b=100):
      """Famous Rosenbrock example"""
  
      return (a - x[0]) ** 2 + b * (x[1] - x[0] ** 2) ** 2
  
imports: from cuml.tsa.batched_lbfgs import batched_fmin_lbfgs_b
  from cuml.internals.safe_imports import cpu_only_import
label_desc: Use image node_id 1 for calling a global function with example usage: rosenbrock(x, a, b) and returns: unknown