Unreachable agent targets might be generated.

[Apolsus]

        # ... line 175 at file enviorment.py
        for i in range(self.num_agents):

            pos_idx = random.randint(0, pos_num - 1)
            partition_idx = 0
            for partition in partition_list:
                if pos_idx >= len(partition):
                    pos_idx -= len(partition)
                    partition_idx += 1
                else:
                    break

            pos = random.choice(partition_list[partition_idx])
            partition_list[partition_idx].remove(pos)
            self.agents_pos[i] = np.asarray(pos, dtype=np.int)

            pos = random.choice(partition_list[partition_idx])
            partition_list[partition_idx].remove(pos)
            self.goals_pos[i] = np.asarray(pos, dtype=np.int)

            partition_list = [partition for partition in partition_list if len(partition) >= 2]
            pos_num = sum([len(partition) for partition in partition_list])

This might not be a right way to generate positions for the agents. Because the connectivity of the partition may be disrupted after the addition of the agents. Which may generate unreachable agent targets.