code: def bench1(x):
      """A benchmark function for test purposes.
  
          f(x) = x ** 2
  
      It has a single minima with f(x*) = 0 at x* = 0.
      """
      return x[0] ** 2
  
file_path: guildai/guild/_skopt/benchmarks.py
imports: import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: bench1(x) and returns: unknown