Question

我想创建一个模型实例，然后保存它，以便我可以在以后加载和解决（与解决相比，初始化需要很长时间）。当我尝试这个时它给了我以下错误。

<button (click)="testService.getDataService()">Button</button>

AttributeError的：不能腌制当地对象'Euphemia。 init .. obj_expression

目标函数是：

with open('model.pickle', 'w') as f:
    pickle.dump(instance, f)

有人知道如何保存具体模型吗？

Answer 1

解决方案是cloudpickle模块，普通的泡菜具有酸洗功能问题。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)

Answer 2

使用DerivativeVar时，似乎泡菜（还有泡菜）将无法工作。

from pyomo.environ import *
from pyomo.dae import *
import pickle
import dill
model = ConcreteModel()
model.x = ContinuousSet(initialize=(0., 1.))
model.y = Var(model.x, initialize=1.)
with open('model1.pickle', 'wb') as f:
    pickle.dump(model, f)

model.dydx = DerivativeVar(model.y, wrt=model.x)
with open('model2.pickle', 'wb') as f:
    try:
        pickle.dump(model, f)
    except TypeError:
        dill.dump(model, f)

莳萝似乎可以代替弱引用：Pickling weakref in Python

如何在pyomo中保存（pickle）模型实例

2 个答案: