fix undefined_all_variable (#32611)

python/paddle/fluid/trainer_desc.py

@@ -17,7 +17,7 @@ import sys
 import os
 __all__ = [
     'TrainerDesc', 'MultiTrainer', 'DistMultiTrainer', 'PipelineTrainer',
-    'HeterXpuTrainer', 'HeterBoxWorker'
+    'HeterXpuTrainer', 'HeterBoxTrainer'
 ]
 
 

python/paddle/fluid/trainer_factory.py

@@ -27,7 +27,7 @@ from .device_worker import Hogwild, DownpourSGD, Section, DownpourSGDOPT
 from .framework import Variable
 from multiprocessing import Process, Manager
 
-__all__ = ["TrainerFactory", "FetchHandler", "FetchHandlerMonitor"]
+__all__ = ["TrainerFactory", "FetchHandlerMonitor"]
 
 
 class TrainerFactory(object):