Created by: trollhe

报错背景: 在aistudio上，进行训练，完成后得到./output/ResNet50_vd/190/ppcls.*

在eval时报错: eval命令: !python tools/eval.py
-c ./configs/quick_start/ResNet50_vd_finetune_eval.yaml

Traceback (most recent call last):
  File "tools/eval.py", line 82, in <module>
    main(args)
  File "tools/eval.py", line 55, in main
    fleet.init(role)
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/incubate/fleet/base/fleet_base.py", line 198, in init
    self._role_maker.generate_role()
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/incubate/fleet/base/role_maker.py", line 500, in generate_role
    assert self._worker_endpoints is not None, "can't find PADDLE_TRAINER_ENDPOINTS"
AssertionError: can't find PADDLE_TRAINER_ENDPOINTS