Add example for finding the first population of gbest

examples/utils/run_g_best.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# Created by "Thieu" at 16:09, 24/11/2023 ----------%                                                                               
+#       Email: [email protected]            %                                                    
+#       Github: https://github.com/thieu1995        %                         
+# --------------------------------------------------%
+
+from opfunu.cec_based.cec2017 import F52017
+from mealpy import FloatVar, BBO
+
+
+# Find the index of population that contains the global best solution.
+def get_first_best_population(opt):
+    for idx, pop_child in enumerate(opt.history.list_population):
+        for agent in pop_child:
+            if agent.target.fitness == opt.g_best.target.fitness:
+                return idx, pop_child
+    return None, None
+
+## Define your own problems
+f1 = F52017(30, f_bias=0)
+
+p1 = {
+    "bounds": FloatVar(lb=f1.lb, ub=f1.ub),
+    "obj_func": f1.evaluate,
+    "minmax": "min",
+    "name": "F5",
+    "log_to": "console",
+    "save_population": True
+}
+
+optimizer = BBO.OriginalBBO(epoch=100, pop_size=30)
+optimizer.solve(p1, seed=10)        # Set seed for each solved problem
+
+idx, my_first_found_best_pop = get_first_best_population(optimizer)
+print(f"The global best solution found at generation: {idx}")
+print(my_first_found_best_pop)