[fix] Lack of HorovodJoin CPU kernels when install Horovod with NCCL,…

… which make unable to run horovod_sync_train_test.

tools/testing/build_and_run_tests.sh

@@ -46,8 +46,19 @@ if ! [ -x "$(command -v nvidia-smi)" ]; then
   EXTRA_ARGS="-n auto"
 fi
 
+# Lack of HorovodJoin CPU kernels when install Horovod with NCCL
+python -m pip uninstall horovod -y
+HOROVOD_WITH_TENSORFLOW=1 \
+HOROVOD_WITHOUT_PYTORCH=1 \
+HOROVOD_WITHOUT_MXNET=1 \
+HOROVOD_WITH_MPI=1 \
+HOROVOD_WITHOUT_GLOO=1 \
+python -m pip install horovod==$HOROVOD_VERSION
 # TODO(jamesrong): Test on GPU.
 CUDA_VISIBLE_DEVICES="" mpirun -np 2 -H localhost:2 --allow-run-as-root pytest -v ./tensorflow_recommenders_addons/dynamic_embedding/python/kernel_tests/horovod_sync_train_test.py
+# Reinstall Horovod after tests
+python -m pip uninstall horovod -y
+bash /install/install_horovod.sh $HOROVOD_VERSION
 
 # Only use GPU 0 if available.
 if [ -x "$(command -v nvidia-smi)" ]; then