django 连接mysql ，在terminal输入python manage.py migrate的时候报错raise ImproperlyConfigured("settings.DATABASES is improperly configured. "django.core.exceptions.ImproperlyConfigured: settings.DATABASES is imp

在切分数据集时提示：ValueError: The least populated class in y has only 1 member, which is too few. The minimum number of groups for any class cannot be less than 2.ValueError:y中填充最少的类只有1个成员，这太少了。任何类别的最小组数不能少于2