python - Pyomo:ValueError:约束“VehicleNumCapRule”没有正确的值。成立 ''
问题描述
同样,作为 pyomo 爱好者和 Python 的狂热爱好者,我试图在 pyomo 中编写带有时间窗(vrptw)的车辆路线问题。我创建 time_window 参数为:
model.time_windows = Param(model.V) # model.V is the set of nodes
在我的 .dat 文件中,我声明了如下参数:
param Time_windows: a b :=
0 1400 1500
1 0000 2400
2 0000 2400
3 0700 2400
4 0000 2400
5 0000 0700
6 0700 2400
7 0700 2400
8 0000 0700
9 0000 2400
10 0000 2400
11 0000 2400
12 0700 2400
13 0000 2400
14 0000 0700
15 0000 0800
16 0000 2400
17 0000 2400
18 0700 1200
19 0000 2400
;
但是,当我运行我的脚本时,我陷入了这个错误:
ERROR: Constructing component 'time_windows' from data={(9, 'a'): 0, (18,
'b'): 1200, (13, 'b'): 2400, (17, 'a'): 0, (6, 'a'): 700, (2, 'a'): 0,
(19, 'b'): 2400, (4, 'b'): 2400, (14, 'b'): 700, (10, 'a'): 0, (12, 'b'):
2400, (18, 'a'): 700, (1, 'b'): 2400, (3, 'a'): 700, (9, 'b'): 2400, (11,
'a'): 0, (17, 'b'): 2400, (14, 'a'): 0, (0, 'b'): 1500, (4, 'a'): 0, (12,
'a'): 700, (8, 'b'): 700, (3, 'b'): 2400, (7, 'b'): 2400, (16, 'b'): 2400,
(15, 'a'): 0, (11, 'b'): 2400, (6, 'b'): 2400, (5, 'a'): 0, (13, 'a'): 0,
(0, 'a'): 1400, (15, 'b'): 800, (8, 'a'): 0, (7, 'a'): 700, (16, 'a'): 0,
(2, 'b'): 2400, (19, 'a'): 0, (1, 'a'): 0, (10, 'b'): 2400, (5, 'b'): 700}
failed:
RuntimeError: Failed to set value for param=time_windows, index=(9,
'a'), value=0.
source error message="Index '(9, 'a')' is not valid for indexed component
'time_windows'"
Traceback (most recent call last):
File "main.py", line 16, in <module>
instance = model.create_instance('data.dat')
File "/usr/local/lib/python2.7/dist-packages/pyomo/core/base/PyomoModel.py", line 723, in create_instance
profile_memory=profile_memory )
File "/usr/local/lib/python2.7/dist-packages/pyomo/core/base/PyomoModel.py", line 806, in load
profile_memory=profile_memory)
File "/usr/local/lib/python2.7/dist-packages/pyomo/core/base/PyomoModel.py", line 870, in _load_model_data
self._initialize_component(modeldata, namespaces, component_name, profile_memory)
File "/usr/local/lib/python2.7/dist-packages/pyomo/core/base/PyomoModel.py", line 925, in _initialize_component
declaration.construct(data)
File "/usr/local/lib/python2.7/dist-packages/pyomo/core/base/param.py", line 858, in construct
% (self.name, str(key), str(val), str(msg)) )
RuntimeError: Failed to set value for param=time_windows, index=(9, 'a'), value=0.
source error message="Index '(9, 'a')' is not valid for indexed component 'time_windows'"
有人可以告诉我发生了什么。提前致谢
编辑:这是包含 model.V 的部分
model.Vo = Set()
model.Vf = Set()
model.Vc = Set()
model.Vfc = model.Vf | model.Vc
model.V = model.Vo | model.Vf | model.Vc # set of nodes
在 .dat 文件中我有:
set Vo := 0;
set Vf := 1 2;
set Vc := 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19;
解决方案
model.time_windows
您的示例代码尝试使用二维数据初始化一维参数。
model.time_windows = Param(model.V, ['a', 'b'])
应该工作。