fix cluster

fleet_rec/core/trainers/tdm_cluster_trainer.py

@@ -19,6 +19,7 @@ Training use fluid with one node only.
 
 from __future__ import print_function
 import logging
+import numpy as np
 import paddle.fluid as fluid
 from paddle.fluid.incubate.fleet.parameter_server.distribute_transpiler import fleet
 from paddle.fluid.incubate.fleet.parameter_server.distribute_transpiler.distributed_strategy import StrategyFactory