"""Abstract Checkpoint classes for callback process
"""
# main imports
import os
import logging
from abc import abstractmethod
[docs]class Callback():
"""
Callback abstract class in order to compute some instruction every evaluation
Attributes:
algo: {Algorithm} -- main algorithm instance reference
every: {int} -- checkpoint frequency used (based on number of evaluations)
filepath: {str} -- file path where checkpoints will be saved
"""
def __init__(self, every, filepath):
self._algo = None
self._every = every
self._filepath = filepath
# build path if not already exists
head, _ = os.path.split(self._filepath)
if not os.path.exists(head):
os.makedirs(head)
[docs] def setAlgo(self, algo):
"""Specify the main algorithm instance reference
Args:
algo: {Algorithm} -- main algorithm instance reference
"""
self._algo = algo
[docs] @abstractmethod
def run(self):
"""
Check if necessary to do backup based on `every` variable
"""
pass
[docs] @abstractmethod
def load(self):
"""
Load last backup line of solution and set algorithm state at this backup
"""
pass