如何从使用cvxpy和CBC的python脚本使用pyinstaller构建exe?

2024-03-28 16:53:00 发布

您现在位置:Python中文网/ 问答频道 /正文

我正在尝试从python脚本构建exe,以使用cvxpy和CBC(通过cylp)以及pyinstaller解决LP问题
代码如下所示:

import numpy as np
import cvxpy as cp

if __name__ == "__main__":
    A = np.array([[2, 0, 0],
                  [1, 0, 2],
                  [0, 3, 1]])
    b = np.array([4, 8, 6])
    c = np.array([3, 4, 2])

    # Define and solve the problem.
    x = cp.Variable(3)
    prob = cp.Problem(cp.Maximize(c.T @ x),
                      [A @ x <= b, x >= 0])
    prob.solve(solver=cp.CBC)
    print(f"solver: {prob.solver_stats.solver_name}")

    # Print result.
    print("The optimal value is", prob.value)
    print("A solution x is")
    print(x.value)

这适用于python解释器

> python .\LP.py
solver: CBC
The optimal value is 16.0
A solution x is
[2. 1. 3.]

但是pyinstaller生成的exe抛出错误

> pyinstaller .\LP.spec
> .\dist\LP.exe
Traceback (most recent call last):
  File "LP.py", line 15, in <module>
    prob.solve(solver=cp.CBC)
  File "cvxpy\problems\problem.py", line 396, in solve
  File "cvxpy\problems\problem.py", line 745, in _solve
  File "cvxpy\problems\problem.py", line 500, in get_problem_data
  File "cvxpy\problems\problem.py", line 651, in _construct_chain
  File "cvxpy\problems\problem.py", line 576, in _find_candidate_solvers
cvxpy.error.SolverError: The solver CBC is not installed.
[18960] Failed to execute script LP

有办法解决这个问题吗?
我无法避免使用CBC,因为我真正想做的是让exe解决一个混合整数规划问题



我的环境:
numpy:1.19.1
cvxpy:1.1.4
cylp:0.91.0
PyInstaller:4.0
Python:3.7.9
平台:Windows 10 v1909 64位

我的规范文件(由pyinstaller .\LP.py -F创建,我修改了datas):

# -*- mode: python ; coding: utf-8 -*-

block_cipher = None


a = Analysis(
    ['LP.py'],
    pathex=['C:\\Users\\aaa\\Desktop\\LP'],
    binaries=[],
    datas=[
        ('C:\\Users\\aaa\\AppData\\Local\\Programs\\Python\\Python37\\Lib\\site-packages\\cylp\\*',
         '.\\cylp\\')],
    hiddenimports=[],
    hookspath=[],
    runtime_hooks=[],
    excludes=[],
    win_no_prefer_redirects=False,
    win_private_assemblies=False,
    cipher=block_cipher,
    noarchive=False)
pyz = PYZ(a.pure, a.zipped_data,
          cipher=block_cipher)
exe = EXE(pyz,
          a.scripts,
          a.binaries,
          a.zipfiles,
          a.datas,
          [],
          name='LP',
          debug=False,
          bootloader_ignore_signals=False,
          strip=False,
          upx=True,
          upx_exclude=[],
          runtime_tmpdir=None,
          console=True)

Tags: inpyfalseislineexecpfile
1条回答
网友
1楼 · 发布于 2024-03-28 16:53:00

我遇到了同样的问题。我尝试了以下两个命令进行构建,结果相同:

    pyinstaller name_of_my_package.py
    pyinstaller  hidden-imports=cylp name_of_my_package.py

但我还是犯了同样的错误。因为我正在用多个文件构建我的,所以我可以进入我的包/cyp/目录的dist/name\u,我可以看到cyp模块文件夹存在,但它在该目录中只有一个子文件夹cy。当我从构建中删除_my_package/cyp/cy/的dist/name_,并将我的cyp文件夹的内容直接从python虚拟环境复制到_my_package/cyp/的dist/name_时,我的exe工作。但只有在不使用onefile标志构建时,才能执行此操作

完成后,我看到以下文件夹结构:

    dist/name_of_my_package/cylp/
    | cpp/
       | <a bunch of stuff in here>
    | cy/
       | <a bunch of stuff in here>
    | py
       | <a bunch of stuff in here>
    | __init__.py
    | VERSION

pyinstaller构建的原始文件夹结构如下所示:

    dist/name_of_my_package/cylp/
    | cy/
       | <a bunch of stuff in here>

pyinstaller似乎知道获取cylp包,但它没有复制所有必需的部分。我不确定这里的真正答案是什么,但这个变通方法目前对我有效。希望有人能给我们指出正确的答案

相关问题 更多 >