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gekko - 由于内存不足，找不到 GEKKO (IPOPT) 解决方案？

问题描述

在使用时间序列数据在动态模式 (m.options.imode=4) 下模拟具有 50 个系列 CSTR 的化学反应器时出现以下错误。稳态运行得很好。此外，动态模拟似乎适用于具有 15 个 CSTR 的更简单模型。

这个问题有解决方案吗？

MUMPS returned INFO(1) =-13 - out of memory when trying to allocate 219104583 bytes.
In some cases it helps to decrease the value of the option "mumps_mem_percent".
WARNING: Problem in step computation; switching to emergency mode.
   1r0.0000000e+000 2.87e+001 9.99e+002   1.5 0.00e+000    -  0.00e+000 0.00e+000R  1
MUMPS returned INFO(1) =-13 - out of memory when trying to allocate 219104583 bytes.
In some cases it helps to decrease the value of the option "mumps_mem_percent".
WARNING: Problem in step computation; switching to emergency mode.
Restoration phase is called at point that is almost feasible,
  with constraint violation 0.000000e+000. Abort.
Restoration phase in the restoration phase failed.

Number of Iterations....: 1

                                   (scaled)                 (unscaled)
Objective...............:  0.0000000000000000e+000   0.0000000000000000e+000
Dual infeasibility......:  0.0000000000000000e+000   0.0000000000000000e+000
Constraint violation....:  2.8680600237259355e+001   2.8680600237259355e+001
Complementarity.........:  0.0000000000000000e+000   0.0000000000000000e+000
Overall NLP error.......:  2.8680600237259355e+001   2.8680600237259355e+001


Number of objective function evaluations             = 2
Number of objective gradient evaluations             = 2
Number of equality constraint evaluations            = 2
Number of inequality constraint evaluations          = 0
Number of equality constraint Jacobian evaluations   = 2
Number of inequality constraint Jacobian evaluations = 0
Number of Lagrangian Hessian evaluations             = 2
Total CPU secs in IPOPT (w/o function evaluations)   =      1.672
Total CPU secs in NLP function evaluations           =      4.237

EXIT: Restoration Failed!

 An error occured.
 The error code is  -2

标签： gekko

解决方案

如果同步模式 ( IMODE=4) 太大并且内存不足，那么我建议您尝试使用 ( IMODE=7) 的顺序模式。

from gekko import GEKKO
m = GEKKO(remote=False)
m.options.IMODE=7

# Your model

m.solve(disp=False)

切换到时的其他几个提示IMODE=7：

  • 用于remote=False在您的计算机而不是公共服务器上求解
  • 用于disp=False不显示求解器输出。打印语句会减慢代码速度。

IMODE=4并且IMODE=7应该给出相同的结果，但它们是不同的解决方法。同步模式在动态优化课程的搭配材料中复习。

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