Warning:
There are known non-determinism issues for RNN functions on some
  versions of cuDNN and CUDA. You can enforce deterministic behavior
  by setting the following environment variables:On CUDA 10.1, set
  environment variable "CUDA_LAUNCH_BLOCKING=1". This may affect
  performance.On CUDA 10.2 or later, set environment variable (note
  the leading colon symbol) "CUBLAS_WORKSPACE_CONFIG=:16:8" or
  "CUBLAS_WORKSPACE_CONFIG=:4096:2".See the cuDNN 8 Release Notes for
  more information.