aistuido notebook 环境
在paddle2.0.2时, 用paddle.Model接口，可以正常使用paddle.Model.eval，设置batch_size=128;
但是在paddle2.1时，设置batch_size=128,会报错，但是显卡占用不是很高。
代码文件：https://aistudio.baidu.com/aistudio/projectdetail/2020923
paddle2.0.2（notebook 的version7版本）环境下正常运行的
paddle2.1.0（notebook的version8版本）下运行，batch_size=128

报错信息：
——————————————————————————————
Eval begin...
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/tensor/creation.py:125: DeprecationWarning: np.object is a deprecated alias for the builtin object. To silence this warning, use object by itself. Doing this will not modify any behavior and is safe.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
if data.dtype == np.object:
ERROR:root:DataLoader reader thread raised an exception!
Exception in thread Thread-6:
Traceback (most recent call last):
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 482, in _get_data
data = self._data_queue.get(timeout=self._timeout)
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/multiprocessing/queues.py", line 105, in get
raise Empty
_queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/threading.py", line 870, in run
self._target(*self._args,**self._kwargs)
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 411, in _thread_loop
batch = self._get_data()
File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 498, in _get_data
"pids: {}".format(len(failed_workers), pids))
RuntimeError: DataLoader 1 workers exit unexpectedly, pids: 468

---------------------------------------------------------------------------SystemError Traceback (most recent call last) in
1 # 模型验证
----> 2 model.evaluate(val_dataset, batch_size=128, num_workers=1)
3 #alt_gvt_large⸱{'acc_top1': 0.8368, 'acc_top5': 0.96588}
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/hapi/model.py in evaluate(self, eval_data, batch_size, log_freq, verbose, num_workers, callbacks)
1815 'metrics': self._metrics_name()})
1816
-> 1817 logs = self._run_one_epoch(eval_loader, cbks, 'eval')
1818
1819 cbks.on_end('eval', logs)
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/hapi/model.py in _run_one_epoch(self, data_loader, callbacks, mode, logs)
1997 def _run_one_epoch(self, data_loader, callbacks, mode, logs={}):
1998 outputs = []
-> 1999 for step, data in enumerate(data_loader):
2000 # data might come from different types of data_loader and have
2001 # different format, as following:
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py innext(self)
583
584 if in_dygraph_mode():
--> 585 data = self._reader.read_next_var_list()
586 data = *restore_batch(data, self.*structure_infos.pop(0))
587 else:
SystemError: (Fatal) Blocking queue is killed because the data reader raises an exception.
[Hint: Expected killed* != true, but received killed*:1 == true:1.] (at /paddle/paddle/fluid/operators/reader/blocking_queue.h:166)