Lesson1 Resnet50 Error Certificate verify failed

Part 1 (2019) UTC+0 UK / EU West
1

Hi
I am new here and have just started and almost completed Lesson1 (up to the Resnet50 training section).

Unfortunately, I have come across the following error and I am not sure if it’s down to a network issue or if I am doing something wrong, any help or pointers will be much appreciated.

I did log-off and on again a few times, but error repeated.

Thanks in advance
Keith

Downloading: “https://download.pytorch.org/models/resnet50-19c8e357.pth” to /root/.cache/torch/checkpoints/resnet50-19c8e357.pth

SSLError Traceback (most recent call last)

/usr/lib/python3.6/urllib/request.py in do_open(self, http_class, req, **http_conn_args) 1317 h.request(req.get_method(), req.selector, req.data, headers, -> 1318 encode_chunked=req.has_header(‘Transfer-encoding’)) 1319 except OSError as err: # timeout error

23 frames

SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)

During handling of the above exception, another exception occurred:

URLError Traceback (most recent call last)

/usr/lib/python3.6/urllib/request.py in do_open(self, http_class, req, **http_conn_args) 1318 encode_chunked=req.has_header(‘Transfer-encoding’)) 1319 except OSError as err: # timeout error -> 1320 raise URLError(err) 1321 r = h.getresponse() 1322 except:

URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)>

2

Left it a while, logged back on again and the issue appears to have resolved itself.

Possibly a network issue on Fastai servers or somewhere in-between?

Issue resolved.

3

Pytorch team said they had an network 403 problem, so you sometime can not download the pre-trained model. I had a similar problem yesterday.

4

Jonathan good evening

Thanks for the update, initially I did think it was something I had done wrong, although on closer inspection of the error and with someone else suggesting the network looked like it was the issue.

Cheers