Basic usage

Follow these steps to solve a basic regression problem:

1. Define an objective function. The objective function takes an individual as an argument and updates the fitness of the individual.

   def objective(individual):
       individual.fitness = ...
       return individual
   

2. Define a callback function to record information about the progress of the evolution:

   history = {}
   history["fitness_parents"] = []
   def recording_callback(pop):
       history["fitness_parents"].append(pop.fitness_parents())
   

3. Use the evolve function that uses default hyperparameters and starts the evolution:

   cgp.evolve(obj, print_progress=True, callback=recording_callback)