The following versions of the TensorFlow api-docs are currently available. Major features, improvements, and changes of each version are available in the release notes.
TensorFlow 2
- r2.17 - release notes
 - r2.16 - release notes
 - r2.15 - release notes
 - r2.14 - release notes
 - r2.13 - release notes
 - r2.12 - release notes
 - r2.11 - release notes
 - r2.10 - release notes
 - r2.9 - release notes
 - r2.8 - release notes
 - r2.7- release notes
 - r2.6- release notes
 - r2.5- release notes
 - r2.4- release notes
 - r2.3- release notes
 - r2.2- release notes
 - r2.1- release notes
 - r2.0- release notes
 
TensorFlow 1
- r1.15 - release notes
 - r1.14 - release notes
 - r1.13 - release notes
 - r1.12 - release notes
 - r1.11 - release notes
 - r1.10 - release notes
 - r1.9 - release notes
 - r1.8 - release notes
 - r1.7 - release notes
 - r1.6 - release notes
 - r1.5 - release notes
 - r1.4 - release notes
 - r1.3 - release notes
 - r1.2 - release notes
 - r1.1 - release notes
 - r1.0 - release notes
 
Earlier branches of the documentation can be found on GitHub.