multiprocessing context has already been set

[limengyuan2021]

---------------------------------------------------------------------------RuntimeError Traceback (most recent call last)/tmp/ipykernel_161/639131080.py in
----> 1 import pgl.utils.data
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/pgl/utils/data/init.py in
1 #-- coding: utf-8 --
2 from .dataset import Dataset, StreamDataset, HadoopDataset
----> 3 from .dataloader import Dataloader
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/pgl/utils/data/dataloader.py in
21 import paddle
22
---> 23 from pgl.utils import mp_reader
24 from pgl.utils.data.dataset import Dataset, StreamDataset
25 from pgl.utils.data.sampler import Sampler, StreamSampler
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/pgl/utils/mp_reader.py in
17 log = logging.getLogger(name)
18 import multiprocessing
---> 19 multiprocessing.set_start_method('fork')
20 log.info("We set multiprocessing start method as 'fork' by default.")
21 import copy
/opt/conda/envs/python35-paddle120-env/lib/python3.7/multiprocessing/context.py in set_start_method(self, method, force)
240 def set_start_method(self, method, force=False):
241 if self._actual_context is not None and not force:
--> 242 raise RuntimeError('context has already been set')
243 if method is None and force:
244 self._actual_context = None
RuntimeError: context has already been set

[DesmonDay]

你好，可以提供一下具体的使用环境吗？包括使用系统、PGL 版本、Paddle版本等，我们这边排查一下~

[limengyuan2021]

paddlefsl 1.0.0
paddlehub 2.0.4
paddlenlp 2.1.1
paddlepaddle-gpu 2.2.1.post101
pgl 2.2.0
是在aistudio 课程里面的
“当前环境至尊GPU”
就是直接在终端pip 安装的pgl ，谢谢~

[DesmonDay]

嗯嗯，我这边复现出问题了，会尽快解决的，谢谢！

[DesmonDay]

一个解决方式是回退一下 PGL 版本哈，可以暂时退回2.1版本。

[limengyuan2021]

好的谢谢

[DesmonDay]

对了，可以顺便问问是哪个aistudio课程吗？

…

------------------ 原始邮件 ------------------ 发件人: limengyuan988 ***@***.***> 发送时间: 2021年12月16日 18:28 收件人: PaddlePaddle/PGL ***@***.***> 抄送: Siming Dai ***@***.***>, Comment ***@***.***> 主题: Re: [PaddlePaddle/PGL] import pgl.utils.data 报错 (Issue #355) 好的谢谢 — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or unsubscribe. Triage notifications on the go with GitHub Mobile for iOS or Android.

[limengyuan2021]

图机器学习 我们学校的课程