message: Update Requirements in README.md
diff: @@ -14,7 +14,12 @@ Please find more introductions in our [**HugeCTR User Guide**](docs/hugectr_user
  * cuDNN >= 7.5
  * NCCL >= 2.0
  * Clang-Format 3.8
  -* OpenMPI >= 4.0 (optional, if require multi-nodes training)
  +* GCC >= 7.4.0
  +* Compiler should have OpenMP support
  +### Optional, if require multi-nodes training ###
  +* OpenMPI >= 4.0
  +* UCX library >= 1.6
  +* HWLOC library >= 2.1.0
  ## Build ##
  ### Init Git ###
  