RuntimeError: Mosek library is not loaded

[Zhanwei-Liu]

While try using mosek to build and solve model, I encountered the following error: RuntimeError: Mosek library is not loaded.
I am using MacOS and Python 3.9.16.
Error message:

  File "/Users/energy/Downloads/PREP-SHOT/prepshot/model.py", line 11, in main
    model = mosek.Model()
  File "/Users/energy/miniconda3/envs/prep-shot/lib/python3.9/site-packages/pyoptinterface/_src/mosek.py", line 352, in __init__
    init_default_env()
  File "/Users/energy/miniconda3/envs/prep-shot/lib/python3.9/site-packages/pyoptinterface/_src/mosek.py", line 105, in init_default_env
    DEFAULT_ENV = Env()
RuntimeError: Mosek library is not loaded.

Code example:

from pyoptinterface import mosek
model = mosek.Model()

I have installed mosek and set the following environment variables:

export MOSEK_10_2_BINDIR=/Users/energy/mosek/10.2/tools/platform/osxaarch64/bin/
export PATH=$PATH:/Users/energy/mosek/10.2/tools/platform/osxaarch64/bin/

While directly typing mosek in the terminal, i got the following output

MOSEK Version 10.2.1 (Build date: 2024-6-13 08:48:49)
Copyright (c) MOSEK ApS, Denmark WWW: mosek.com
Platform: MACOSX/aarch64

*** No input file specfied. No optimization is performed.

Return code - 0  [MSK_RES_OK]

By the way, MOSEK license file path: /Users/energy/mosek/mosek.lic and using Gurobi or HiGHS works well.

[metab0t]

Are you using the latest 0.2.4 version of PyOptInterface? Autoloading Mosek 10.2 is only added in 0.2.4.

Can you run ls /Users/energy/mosek/10.2/tools/platform/osxaarch64/bin/ to show its content?

You can run the script as follows to test why it cannot load the library:

import os
import platform
from pathlib import Path
import re
import logging

logging.basicConfig(level=logging.INFO)

from pyoptinterface import mosek

def detected_libraries():
    libs = []

    libname_pattern = {
        "Linux": r"libmosek64\.so",
        "Darwin": r"libmosek64\.dylib",
        "Windows": r"mosek64_(\d+)_(\d+)\.dll",
    }[platform.system()]
    suffix_pattern = {
        "Linux": "*.so",
        "Darwin": "*.dylib",
        "Windows": "*.dll",
    }[platform.system()]

    # Environment
    home = os.environ.get("MOSEK_10_2_BINDIR", None)
    if home is None:
        home = os.environ.get("MOSEK_10_1_BINDIR", None)
    if home and os.path.exists(home):
        dir = Path(home)
        for path in dir.glob(suffix_pattern):
            match = re.match(libname_pattern, path.name)
            if match:
                libs.append(str(path))

    # mosekpy installation
    try:
        import mosek

        dir = Path(mosek.__path__[0])

        libname_pattern = {
            "Linux": r"libmosek64\.so\.*",
            "Darwin": r"libmosek64\.*\.dylib",
            "Windows": r"mosek64_(\d+)_(\d+)\.dll",
        }[platform.system()]
        suffix_pattern = {
            "Linux": "*.so.*",
            "Darwin": "*.dylib",
            "Windows": "*.dll",
        }[platform.system()]

        for path in dir.glob(suffix_pattern):
            match = re.match(libname_pattern, path.name)
            if match:
                libs.append(str(path))
    except Exception:
        pass

    # default names
    default_libname = {
        "Linux": "libmosek64.so",
        "Darwin": "libmosek64.dylib",
        "Windows": "mosek64_10_2.dll",
    }[platform.system()]
    libs.append(default_libname)

    return libs


def autoload_library():
    libs = detected_libraries()
    for lib in libs:
        ret = mosek.load_library(lib)
        if ret:
            logging.info(f"Loaded Mosek library: {lib}")
            return True
        else:
            logging.info(f"Cannot load Mosek library from {lib}")
    return False

autoload_library()

[Zhanwei-Liu]

Thank you for your quick response!

Previously I am using PyOptInterface 0.2.3 version. After I update to 0.2.4 version, error did not appear. Now mosek also works well.

By the way, while i can run the above script, i got following output:

INFO:root:Loaded Mosek library: /Users/energy/mosek/10.2/tools/platform/osxaarch64/bin/libmosek64.dylib
INFO:root:Loaded Mosek library: /Users/energy/mosek/10.2/tools/platform/osxaarch64/bin/libmosek64.dylib

I think my problem is solved, thank you very much!

[metab0t]

Yes, it now detects the Mosek library correctly.