Error while fetching URL in VGG16

[Shwetago]

I am getting this error in VGG16/19 and in DenseNet201. I haven't tried other applications.

---------------------------------------------------------------------------
gaierror                                  Traceback (most recent call last)
/opt/conda/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

/opt/conda/lib/python3.6/http/client.py in request(self, method, url, body, headers, encode_chunked)
   1238         """Send a complete request to the server."""
-> 1239         self._send_request(method, url, body, headers, encode_chunked)
   1240 

/opt/conda/lib/python3.6/http/client.py in _send_request(self, method, url, body, headers, encode_chunked)
   1284             body = _encode(body, 'body')
-> 1285         self.endheaders(body, encode_chunked=encode_chunked)
   1286 

/opt/conda/lib/python3.6/http/client.py in endheaders(self, message_body, encode_chunked)
   1233             raise CannotSendHeader()
-> 1234         self._send_output(message_body, encode_chunked=encode_chunked)
   1235 

/opt/conda/lib/python3.6/http/client.py in _send_output(self, message_body, encode_chunked)
   1025         del self._buffer[:]
-> 1026         self.send(msg)
   1027 

/opt/conda/lib/python3.6/http/client.py in send(self, data)
    963             if self.auto_open:
--> 964                 self.connect()
    965             else:

/opt/conda/lib/python3.6/http/client.py in connect(self)
   1391 
-> 1392             super().connect()
   1393 

/opt/conda/lib/python3.6/http/client.py in connect(self)
    935         self.sock = self._create_connection(
--> 936             (self.host,self.port), self.timeout, self.source_address)
    937         self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)

/opt/conda/lib/python3.6/socket.py in create_connection(address, timeout, source_address)
    703     err = None
--> 704     for res in getaddrinfo(host, port, 0, SOCK_STREAM):
    705         af, socktype, proto, canonname, sa = res

/opt/conda/lib/python3.6/socket.py in getaddrinfo(host, port, family, type, proto, flags)
    744     addrlist = []
--> 745     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
    746         af, socktype, proto, canonname, sa = res

gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

URLError                                  Traceback (most recent call last)
/opt/conda/lib/python3.6/site-packages/keras/utils/data_utils.py in get_file(fname, origin, untar, md5_hash, file_hash, cache_subdir, hash_algorithm, extract, archive_format, cache_dir)
    221             try:
--> 222                 urlretrieve(origin, fpath, dl_progress)
    223             except HTTPError as e:

/opt/conda/lib/python3.6/urllib/request.py in urlretrieve(url, filename, reporthook, data)
    247 
--> 248     with contextlib.closing(urlopen(url, data)) as fp:
    249         headers = fp.info()

/opt/conda/lib/python3.6/urllib/request.py in urlopen(url, data, timeout, cafile, capath, cadefault, context)
    222         opener = _opener
--> 223     return opener.open(url, data, timeout)
    224 

/opt/conda/lib/python3.6/urllib/request.py in open(self, fullurl, data, timeout)
    525 
--> 526         response = self._open(req, data)
    527 

/opt/conda/lib/python3.6/urllib/request.py in _open(self, req, data)
    543         result = self._call_chain(self.handle_open, protocol, protocol +
--> 544                                   '_open', req)
    545         if result:

/opt/conda/lib/python3.6/urllib/request.py in _call_chain(self, chain, kind, meth_name, *args)
    503             func = getattr(handler, meth_name)
--> 504             result = func(*args)
    505             if result is not None:

/opt/conda/lib/python3.6/urllib/request.py in https_open(self, req)
   1360             return self.do_open(http.client.HTTPSConnection, req,
-> 1361                 context=self._context, check_hostname=self._check_hostname)
   1362 

/opt/conda/lib/python3.6/urllib/request.py in do_open(self, http_class, req, **http_conn_args)
   1319             except OSError as err: # timeout error
-> 1320                 raise URLError(err)
   1321             r = h.getresponse()

URLError: <urlopen error [Errno -3] Temporary failure in name resolution>

During handling of the above exception, another exception occurred:

Exception                                 Traceback (most recent call last)
<ipython-input-10-5045d1f236d6> in <module>()
      1 vgg = VGG16(weights='imagenet', 
      2                   include_top=False,
----> 3                   input_shape=(32, 32, 3))
      4 vgg.trainable = False

/opt/conda/lib/python3.6/site-packages/keras/applications/__init__.py in wrapper(*args, **kwargs)
     26             kwargs['models'] = models
     27             kwargs['utils'] = utils
---> 28         return base_fun(*args, **kwargs)
     29 
     30     return wrapper

/opt/conda/lib/python3.6/site-packages/keras/applications/vgg16.py in VGG16(*args, **kwargs)
      9 @keras_modules_injection
     10 def VGG16(*args, **kwargs):
---> 11     return vgg16.VGG16(*args, **kwargs)
     12 
     13 

/opt/conda/lib/python3.6/site-packages/keras_applications/vgg16.py in VGG16(include_top, weights, input_tensor, input_shape, pooling, classes, **kwargs)
    207                 WEIGHTS_PATH_NO_TOP,
    208                 cache_subdir='models',
--> 209                 file_hash='6d6bbae143d832006294945121d1f1fc')
    210         model.load_weights(weights_path)
    211         if backend.backend() == 'theano':

/opt/conda/lib/python3.6/site-packages/keras/utils/data_utils.py in get_file(fname, origin, untar, md5_hash, file_hash, cache_subdir, hash_algorithm, extract, archive_format, cache_dir)
    224                 raise Exception(error_msg.format(origin, e.code, e.msg))
    225             except URLError as e:
--> 226                 raise Exception(error_msg.format(origin, e.errno, e.reason))
    227         except (Exception, KeyboardInterrupt):
    228             if os.path.exists(fpath):

Exception: URL fetch failure on https://github.com/fchollet/deep-learning-models/releases/download/v0.1/vgg16_weights_tf_dim_ordering_tf_kernels_notop.h5: None -- [Errno -3] Temporary failure in name resolution

[taehoonlee]

@Shwetago, It doesn't seem to be a Keras issue. I guess your network is unstable.

[Shwetago]

@taehoonlee It was not a network issue but I have resolved it. Thank you for responding. I'll close this issue now.

[NVS16]

How didi you solve it? I have the same problem.