code: def objective(x, a, b):
      return a * (x**0.5) + b
  
file_path: ray/doc/source/tune/doc_code/trainable.py
imports: from ray import train, tune
  from ray import train, tune
  from ray import train, tune
label_desc: Use image node_id 1 for calling a global function with example usage: objective(x, a, b) and returns: unknown