# \[DataLoader\] num\_of\_worker\>0, error occurs

**URL:** <https://discuss.pytorch.org/t/dataloader-num-of-worker-0-error-occurs/52250>\
**Category:** Uncategorized\
**Created:** [August 1, 2019, 1:14am UTC](https://discuss.pytorch.org/t/dataloader-num-of-worker-0-error-occurs/52250 "2019-08-01T01:14:24Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ptrblck](https://discuss.pytorch.org/user_avatar/discuss.pytorch.org/ptrblck/32/1823_2.png) [@ptrblck](https://discuss.pytorch.org/u/ptrblck)\
**Post date:** [August 2, 2019, 8:46pm UTC](https://discuss.pytorch.org/t/dataloader-num-of-worker-0-error-occurs/52250/2 "2019-08-02T20:46:46Z")

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It looks like you are running into some issues using multiprocessing and a HDF5 file.  
Have a look at [this topic](https://discuss.pytorch.org/t/dataloader-when-num-worker-0-there-is-bug/25643/14).

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