code: def main():
      """Main function."""
      domain_vars = [
          {
              "name": "hubble_constant",
              "type": "float",
              "min": 60,
              "max": 80,
          },
          {"name": "omega_m", "type": "float", "min": 0, "max": 1},
          {"name": "omega_l", "type": "float", "min": 0, "max": 1},
      ]
      fidel_vars = [
          {
              "name": "log10_resolution",
              "type": "float",
              "min": 2,
              "max": 5,
          },
          {
              "name": "num_obs_to_use",
              "type": "int",
              "min": 50,
              "max": 192,
          },
      ]
      fidel_to_opt = [5, 192]
      max_capital = 2 * 60 * 60  # Optimisation budget in seconds
  
      # A parallel set up where we will evaluate the function in three different threads.
      num_workers = 3
  
      # Optimise without multi-fidelity
      config_params = {"domain": domain_vars}
      config = load_config(config_params)
      opt_val, opt_pt, history = maximise_function(
          snls_objective,
          config.domain,
          max_capital,
          num_workers=num_workers,
          capital_type="realtime",
          config=config,
      )
      print(opt_pt, opt_val)
  
      # Optimise with multi-fidelity
      config_params = {
          "domain": domain_vars,
          "fidel_space": fidel_vars,
          "fidel_to_opt": fidel_to_opt,
      }
      config = load_config(config_params)
      # Optimise
      mf_opt_val, mf_opt_pt, history = maximise_multifidelity_function(
          snls_mf_objective,
          config.fidel_space,
          config.domain,
          config.fidel_to_opt,
          snls_mf_cost,
          max_capital,
          config=config,
      )
      print(mf_opt_pt, mf_opt_val)
  
imports: from dragonfly import load_config, maximise_function, maximise_multifidelity_function
  from snls import objective
  from snls_mf import objective
  from snls_mf import cost
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types