URLError with Cell Detection with Contour Proposal Networks: <urlopen error [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:997)>

[ugurdinc-icns]

Cell Detection with Contour Proposal Networks notebook is somehow producing the following error, is it more about my own environment ?:

`SSLError Traceback (most recent call last)
File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:1348, in AbstractHTTPHandler.do_open(self, http_class, req, **http_conn_args)
1347 try:
-> 1348 h.request(req.get_method(), req.selector, req.data, headers,
1349 encode_chunked=req.has_header('Transfer-encoding'))
1350 except OSError as err: # timeout error

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:1282, in HTTPConnection.request(self, method, url, body, headers, encode_chunked)
1281 """Send a complete request to the server."""
-> 1282 self._send_request(method, url, body, headers, encode_chunked)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:1328, in HTTPConnection._send_request(self, method, url, body, headers, encode_chunked)
1327 body = _encode(body, 'body')
-> 1328 self.endheaders(body, encode_chunked=encode_chunked)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:1277, in HTTPConnection.endheaders(self, message_body, encode_chunked)
1276 raise CannotSendHeader()
-> 1277 self._send_output(message_body, encode_chunked=encode_chunked)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:1037, in HTTPConnection._send_output(self, message_body, encode_chunked)
1036 del self._buffer[:]
-> 1037 self.send(msg)
1039 if message_body is not None:
1040
1041 # create a consistent interface to message_body

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:975, in HTTPConnection.send(self, data)
974 if self.auto_open:
--> 975 self.connect()
976 else:

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/http/client.py:1454, in HTTPSConnection.connect(self)
1452 server_hostname = self.host
-> 1454 self.sock = self._context.wrap_socket(self.sock,
1455 server_hostname=server_hostname)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/ssl.py:513, in SSLContext.wrap_socket(self, sock, server_side, do_handshake_on_connect, suppress_ragged_eofs, server_hostname, session)
507 def wrap_socket(self, sock, server_side=False,
508 do_handshake_on_connect=True,
509 suppress_ragged_eofs=True,
510 server_hostname=None, session=None):
511 # SSLSocket class handles server_hostname encoding before it calls
512 # ctx._wrap_socket()
--> 513 return self.sslsocket_class._create(
514 sock=sock,
515 server_side=server_side,
516 do_handshake_on_connect=do_handshake_on_connect,
517 suppress_ragged_eofs=suppress_ragged_eofs,
518 server_hostname=server_hostname,
519 context=self,
520 session=session
521 )

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/ssl.py:1071, in SSLSocket._create(cls, sock, server_side, do_handshake_on_connect, suppress_ragged_eofs, server_hostname, context, session)
1070 raise ValueError("do_handshake_on_connect should not be specified for non-blocking sockets")
-> 1071 self.do_handshake()
1072 except (OSError, ValueError):

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/ssl.py:1342, in SSLSocket.do_handshake(self, block)
1341 self.settimeout(None)
-> 1342 self._sslobj.do_handshake()
1343 finally:

SSLError: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:997)

During handling of the above exception, another exception occurred:

URLError Traceback (most recent call last)
Cell In [14], line 1
----> 1 train_bbbc039 = cd.data.BBBC039Train(conf.directory, download=conf.download_data)
2 val_bbbc039 = cd.data.BBBC039Val(conf.directory)
3 test_bbbc039 = cd.data.BBBC039Test(conf.directory)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/celldetection/data/datasets/bbbc039.py:93, in BBBC039Train.init(self, directory, download)
81 def init(self, directory, download=False):
82 """BBBC039 Train.
83
84 Training split of the BBBC039 dataset.
(...)
91 download: Whether to download the dataset.
92 """
---> 93 super().init(directory, download=download, mode='train')

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/celldetection/data/datasets/bbbc039.py:58, in _BBBC039.init(self, directory, download, mode)
55 images_directory = join(directory, 'images')
57 if download:
---> 58 download_bbbc039(directory)
60 self.names = read_all(meta_directory, {
61 'train': 'training.txt',
62 'val': 'validation.txt',
63 'test': 'test.txt'
64 }[mode])
66 self.images, self.masks, self.labels = load(images_directory, masks_directory, self.names)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/celldetection/data/datasets/bbbc039.py:46, in download_bbbc039(directory)
40 makedirs(directory, exist_ok=True)
41 for url in [
42 'https://data.broadinstitute.org/bbbc/BBBC039/images.zip',
43 'https://data.broadinstitute.org/bbbc/BBBC039/metadata.zip',
44 'https://data.broadinstitute.org/bbbc/BBBC039/masks.zip'
45 ]:
---> 46 torchvision.datasets.utils.download_and_extract_archive(url, directory)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/torchvision/datasets/utils.py:446, in download_and_extract_archive(url, download_root, extract_root, filename, md5, remove_finished)
443 if not filename:
444 filename = os.path.basename(url)
--> 446 download_url(url, download_root, filename, md5)
448 archive = os.path.join(download_root, filename)
449 print(f"Extracting {archive} to {extract_root}")

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/torchvision/datasets/utils.py:146, in download_url(url, root, filename, md5, max_redirect_hops)
143 _download_file_from_remote_location(fpath, url)
144 else:
145 # expand redirect chain if needed
--> 146 url = _get_redirect_url(url, max_hops=max_redirect_hops)
148 # check if file is located on Google Drive
149 file_id = _get_google_drive_file_id(url)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/site-packages/torchvision/datasets/utils.py:94, in _get_redirect_url(url, max_hops)
91 headers = {"Method": "HEAD", "User-Agent": USER_AGENT}
93 for _ in range(max_hops + 1):
---> 94 with urllib.request.urlopen(urllib.request.Request(url, headers=headers)) as response:
95 if response.url == url or response.url is None:
96 return url

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:216, in urlopen(url, data, timeout, cafile, capath, cadefault, context)
214 else:
215 opener = _opener
--> 216 return opener.open(url, data, timeout)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:519, in OpenerDirector.open(self, fullurl, data, timeout)
516 req = meth(req)
518 sys.audit('urllib.Request', req.full_url, req.data, req.headers, req.get_method())
--> 519 response = self._open(req, data)
521 # post-process response
522 meth_name = protocol+"_response"

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:536, in OpenerDirector._open(self, req, data)
533 return result
535 protocol = req.type
--> 536 result = self._call_chain(self.handle_open, protocol, protocol +
537 '_open', req)
538 if result:
539 return result

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:496, in OpenerDirector._call_chain(self, chain, kind, meth_name, *args)
494 for handler in handlers:
495 func = getattr(handler, meth_name)
--> 496 result = func(*args)
497 if result is not None:
498 return result

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:1391, in HTTPSHandler.https_open(self, req)
1390 def https_open(self, req):
-> 1391 return self.do_open(http.client.HTTPSConnection, req,
1392 context=self._context, check_hostname=self._check_hostname)

File ~/anaconda3/envs/trial_celldetect/lib/python3.10/urllib/request.py:1351, in AbstractHTTPHandler.do_open(self, http_class, req, **http_conn_args)
1348 h.request(req.get_method(), req.selector, req.data, headers,
1349 encode_chunked=req.has_header('Transfer-encoding'))
1350 except OSError as err: # timeout error
-> 1351 raise URLError(err)
1352 r = h.getresponse()
1353 except:

URLError: <urlopen error [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:997)>`