今天我在测试“rope换脸”程序的时候，结果执行以下命令：
(venv) E:\Rope>.\venv\Scripts\pip.exe install -r .\requirements.txt -i https://mirrors.aliyun.com/pypi/simple
安装中途报了以下错误：
nts. This could take a while.
INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of numpy to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install -r .\requirements.txt (line 4), -r .\requirements.txt (line 5), -r .\requirements.txt (line 8), -r .\requirements.txt (line 9) and numpy==1.23.5 because these package versions have conflicting dependencies.
The conflict is caused by:
The user requested numpy==1.23.5
opencv-python 4.7.0.72 depends on numpy>=1.21.2; python_version >= "3.10"
opencv-python 4.7.0.72 depends on numpy>=1.22.0; python_version >= "3.11"
opencv-python 4.7.0.72 depends on numpy>=1.17.0; python_version >= "3.7"
opencv-python 4.7.0.72 depends on numpy>=1.17.3; python_version >= "3.8"
opencv-python 4.7.0.72 depends on numpy>=1.19.3; python_version >= "3.9"
scikit-image 0.21.0 depends on numpy>=1.21.1
onnx 1.14.0 depends on numpy
onnxruntime-gpu 1.15.1 depends on numpy>=1.24.2
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
[notice] A new release of pip available: 22.3.1 -> 23.3
[notice] To update, run: python.exe -m pip install --upgrade pip中文翻译
错误：无法安装-r。\requirements.txt（第4行），-r。\requirements.txt（第5行），-r。\requirements.txt（第8行），-r。\requirements.txt（第9行）和numpy==1.23.5，因为这些包版本具有冲突的依赖关系。
冲突是由以下原因引起的：
用户请求的numpy==1.23.5
opencv-python 4.7.0.72依赖于numpy>=1.1.21.2；python_version>=“3.10”
opencv-python 4.7.0.72依赖于numpy>=1.22.0；python_version>=“3.11”
opencv-python 4.7.0.72依赖于numpy>=1.1.7；python_version>=“3.7”
opencv-python 4.7.0.72依赖于numpy>=1.17.3；python_version>=“3.8”
opencv-python 4.7.0.72依赖于numpy>=1.19.3；python_version>=“3.9”
scikit-image 0.21.0取决于numpy>=1.21.1
onnx 1.14.0取决于numpy
onnxruntime gpu 1.15.1取决于numpy>=1.24.2
要解决此问题，您可以尝试：
1.放宽您指定的软件包版本范围
2.删除包版本以允许pip尝试解决依赖冲突
错误：ResolutionImpossible:有关帮助，请访问https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
〔通知〕新版本的pip可用：22.3.1->23.3
[注意]要更新，请运行：python.exe-m pip install--upgrade pip
原因：
通过上面的翻译，我们也能知道一个具体的原因，冲突是由以下原因引起的：
用户请求的numpy==1.23.5
opencv-python 4.7.0.72依赖于numpy>=1.1.21.2；python_version>=“3.10”
opencv-python 4.7.0.72依赖于numpy>=1.22.0；python_version>=“3.11”
opencv-python 4.7.0.72依赖于numpy>=1.1.7；python_version>=“3.7”
opencv-python 4.7.0.72依赖于numpy>=1.17.3；python_version>=“3.8”
opencv-python 4.7.0.72依赖于numpy>=1.19.3；python_version>=“3.9”
scikit-image 0.21.0取决于numpy>=1.21.1
onnx 1.14.0取决于numpy
onnxruntime gpu 1.15.1取决于numpy>=1.24.2
简单点来说，requirements.txt 这个文件里面：
要求的 numpy==1.23.5
而里面 onnxruntime gpu 1.15.1 却要求 numpy>=1.23.5
因此，就冲突了。
解决方法
上面的翻译其实也给了解决的思路：
1、放宽您指定的软件包版本范围。
2、删除包版本以允许pip尝试解决依赖冲突。
由于我这个程序不能随便“删除包版本以允许pip尝试解决依赖冲突”。
我只好按照：Python依赖冲突怎么解决？此文章。
通过“放宽您指定的软件包版本范围”来解决这个问题。
具体操作如下：
1、打开 requirements.txt 文件。
内容如下：
--extra-index-url https://download.pytorch.org/whl/cu118
numpy==1.23.5
opencv-python==4.7.0.72
scikit-image==0.21.0
tk==0.1.0
pillow==9.5.0
onnx==1.14.0
onnxruntime-gpu==1.15.1
protobuf==4.23.2
torch==2.0.1+cu118
torchvision==0.15.2
torchaudio==2.0.2
tqdm
ftfy
regex
2、把
numpy==1.23.5
改为
numpy>=1.23.5
3、保存，再重新安装即可正常，再也不报任何错误了。
