Commits on Jun 17, 2021

1. [topi][CuDNN] Removed requirement for GPU from topi conv2d_cudnn.cuda… …

   … and conv3d_cudnn.cuda
   
   Previously, `conv2d_cudnn.cuda` would use cudnn's benchmarking
   function to select a forward convolution when `cfg.is_fallback`, and
   `conv3d_cudnn.cuda` would use cudnn's benchmarking at all times.
   After this commit, both expose the cudnn algorithm choice as an
   option.  If `cfg.is_fallback`, the local device will be benchmarked if
   present, otherwise will select a default cudnn implementation.
   
   In the future, to better support RPC use-cases, the fallback config
   should be based on cudnn-specific parameters saved in the Target
   object.

   

   Lunderberg committed Jun 17, 2021
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