ERROR: Could not find a version that satisfies the requirement detectron2 (from versions: none)

根据引用和引用的信息，报错"ERROR: Could not find a version that satisfies the requirement detectron2 (from versions: none)"可能是因为无法找到满足detectron2要求的版本。这可能是因为detectron2的版本不存在或者当前系统中没有相应的库。另外，根据引用的信息可以看出，有时候安装特定版本的库可能需要使用相应版本的Python和pip。如果你使用的是Python2.7，那么可能没有detectron2的适用版本。解决这个问题的第一种情况是，如果你安装了pip3.6，你可以尝试使用Python3.6的pip去安装detectron2，因为这个版本可能与Python3.6兼容。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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