conda更新环境报错：无法解除不可管理包torchvision、torchaudio

在Windows 11系统下使用conda 24.5.0执行conda install django-environ时，终端抛出RuntimeError，提示无法解除pypi源的torchvision-0.18.1与torchaudio-2.3.1包，当前仅能通过删除conda环境并重装所有包完成新包安装。

终端执行命令及报错信息 #

conda install django-environ
Channels:
 - conda-forge
 - defaults
 - nvidia
 - pytorch
Platform: win-64
Collecting package metadata (repodata.json): done
Solving environment: | WARNING conda.conda_libmamba_solver.solver:_export_solved_records(832): Tried to unlink torchaud?
WARNING conda.conda_libmamba_solver.solver:_export_solved_records(832): Tried to unlink torchvision-0.18.1-py3.11.egg-i?
done

# >>>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\exception_handler.py", line 18, in __call__
        return func(*args, **kwargs)
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\cli\main.py", line 84, in main_subshell
        exit_code = do_call(args, parser)
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\cli\conda_argparse.py", line 200, in do_call
        result = getattr(module, func_name)(args, parser)
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\notices\core.py", line 132, in wrapper
        return func(*args, **kwargs)
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\cli\main_install.py", line 152, in execute
        return install(args, parser, "install")
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\cli\install.py", line 377, in install
        unlink_link_transaction = solver.solve_for_transaction(
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\core\solve.py", line 153, in solve_for_transaction
        unlink_precs, link_precs = self.solve_for_diff(
      File "C:\ProgramData\miniconda3\lib\site-packages\conda\core\solve.py", line 239, in solve_for_diff
        raise RuntimeError(
    RuntimeError: Cannot unlink unmanageable packages:
      - pypi/pypi::torchvision-0.18.1-pypi_0
      - pypi/pypi::torchaudio-2.3.1-pypi_0

environment.yaml配置 #

channels:
  - conda-forge
  - pytorch
  - nvidia
  - nodefaults

dependencies:
 - python=3.11.*
 - pip
 - pytest
 - pytorch::pytorch
 - pytorch::torchvision
 - pytorch::torchaudio
 - pytorch-cuda=12.1
 - ultralytics
 - numpy
 - opencv
 - matplotlib
 - pandas 
 - joblib
 - kornia>=0.6.11
 - google-cloud-vision
 - django-environ

相关版本信息 #

• OS: Windows 11
• Python: 3.11.9
• pip: 24.0
• conda: 24.5.0

报错核心是conda无法管理通过pip安装的包：当前环境中torchvision和torchaudio实际是从pypi源安装的（标记为pypi/pypi::），但environment.yaml中指定的是从pytorch频道安装。当conda解决依赖需要调整这两个包时，因为它们不属于conda管理范畴，无法执行卸载/更新操作，从而抛出RuntimeError。

方案1：替换pip安装的包为conda管理版本 #

先卸载pip安装的torchvision和torchaudio，再用conda安装指定频道的版本：

pip uninstall torchvision torchaudio -y
conda install pytorch::torchvision pytorch::torchaudio -y

完成后再执行：

conda install django-environ

方案2：开启conda与pip的互操作模式 #

通过配置让conda尝试管理pip安装的包（注意：该模式可能存在依赖冲突风险，需谨慎使用）：

conda config --set pip_interop_enabled True

配置完成后重新执行conda install django-environ。

方案3：重建conda环境（备用方案） #

如果以上方法无效，可采用重装方案，直接通过yaml文件重建更高效：

1. 删除现有环境：

   conda env remove -n <你的环境名>
   

2. 用yaml文件创建新环境：

   conda env create -f environment.yaml
   

内容的提问来源于stack exchange，提问作者teejk