$ pip install tensorflow-gpu==1.15.0
Collecting tensorflow-gpu==1.15.0
Cache entry deserialization failed, entry ignored
Could not find a version that satisfies the requirement tensorflow-gpu==1.15.0 (from versions: 0.12.0, 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, 2.0.0a0, 2.0.0b0, 2.0.0b1)
No matching distribution found for tensorflow-gpu==1.15.0
You are using pip version 8.1.2, however version 20.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
$ pip install tensorflow-gpu==1.13.1
Collecting tensorflow-gpu==1.13.1