PackagesNotFoundError: The following packages are not available from current channels: - torchvision==0.7.0

`PackagesNotFoundError: The following packages are not available from current channels` 错误信息表明您尝试安装的 `torchvision` 包的特定版本 `0.7.0` 在当前配置的包管理器频道中无法找到。这可能是因为该版本不再被维护，或者从未在您使用的包管理器频道中发布过。此外，还可能是由于您的包管理器频道列表过时，或者您的环境配置不正确。

为了解决这个问题，您可以尝试以下几个步骤：

1. 确认您正在使用的包管理器（如 `conda` 或 `pip`）配置的频道是否是最新的，或者是否包含了 `torchvision==0.7.0` 的源。
2. 如果您使用的是 `conda`，尝试添加或更新 `conda-forge` 等第三方频道，因为它们往往包含更多的包版本。
3. 如果上述方法仍然无法解决问题，您可能需要安装兼容的最新版本的 `torchvision`，或者考虑创建一个新的虚拟环境并更新包管理器的频道。

以下是一个使用 `conda` 更换频道并尝试安装 `torchvision` 的示例命令：

conda config --add channels conda-forge
conda install torchvision

请记住，在尝试安装包之前，始终检查您正在使用的频道列表是否包含了您想要安装的包的版本。

相关问题

PackagesNotFoundError: The following packages are not available from current channels: - torchvision

PackagesNotFoundError: The following packages are not available from current channels, such as torchvision, usually occur when the desired package is not found in the default channels of Anaconda. This can happen if the package is not yet available or if the channels you are using do not have the package.

To resolve this issue, you can try the following steps:

1. Update conda:

   conda update conda

2. Try installing the package from a different channel:

   conda install -c pytorch torchvision

3. If the package is still not found, you can manually download the package and install it using the `pip` command. First, download the package from the PyPI website (https://pypi.org/) or other trusted sources. Then, navigate to the directory where the downloaded package is located and use the following command to install it:

   pip install <package_name>.whl

Please note that manually downloading and installing packages may have dependencies that need to be resolved separately. Make sure to check the package documentation for any additional requirements.

PackagesNotFoundError: The following packages are not available from current channels: - python=3.9

PackagesNotFoundError: The following packages are not available from current channels: - python=3.9 [2]。

出现这个错误的原因是因为你将安装源设置为清华镜像，而在2019年4月份，清华镜像的anaconda源已经无法使用了。所以你需要手动下载python 3.9的whl文件来进行安装。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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