pip3 install tensorflow==1.15.2
Collecting tensorflow==1.15.2
Could not find a version that satisfies the requirement tensorflow==1.15.2 (from versions: 0.12.1, 1.0.0, 1.0.1, 1.1.0, 1.2.0, 1.2.1, 1.3.0, 1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.7.0, 1.7.1, 1.8.0, 1.9.0, 1.10.0, 1.10.1, 1.11.0, 1.12.0, 1.12.2, 1.12.3, 1.13.1, 1.13.2, 1.14.0)
No matching distribution found for tensorflow==1.15.2
因为pip版本是9.0.1， 升级pip 到21.3.1 后没问题了
pip3 install pip -U
