我想创建一个模型实例,然后保存它,以便稍后加载和求解(与求解相比,初始化需要相当长的时间)。 当我尝试这个时,它给了我以下错误。
with open('model.pickle', 'w') as f:
pickle.dump(instance, f)
属性错误: 无法腌制本地对象“Euphemia.init..obj_expression
”目标函数是这样的:
def obj_expression(model):
curve = sum(model.x[area, hour, Type, index] * model.Q[area, hour, Type, index] *
( model.P1[area, hour, Type, index] + model.P0[area, hour, Type, index] ) / 2
for (area, hour, Type, index) in model.Curve )
bids = sum(model.y[area, index] * model.PB[area, index] *
sum( model.QB[area, index, hour] for (hour) in model.Hours )
for (area, index) in model.Bids )
return curve + bids
self.model.OBJ = pe.Objective(rule = obj_expression, sense = pe.maximize)
有人知道如何保存具体模型吗?
最佳答案
解决方案是cloudpickle模块,常规pickle在pickling功能上存在问题。一个例子:
import cloudpickle
with open('test.pkl', mode='wb') as file:
cloudpickle.dump(instance, file)
with open('test.pkl', mode='rb') as file:
instance = cloudpickle.load(file)
关于python - 如何在 pyomo 中保存(pickle)模型实例,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50834258/