title: How to know which cuDNN version one should use?
body: <p>I plan to use cuDNN on Linux: how to know which cuDNN version I need? Should I always use the most recent one?</p>
  
  <p>E.g. choosing the right CUDA version <a href="https://stackoverflow.com/a/30820690/395857">depends on</a> the Nvidia driver version. I wonder if there is similar constrains for choosing the cuDNN (given that it may give some <a href="https://stackoverflow.com/q/33715746/395857">fancy</a> error messages later on I'd prefer to know before I try).</p>