例外：加载数据时获取 URL 失败答案

【问题标题】：Exception: URL fetch failure when loading data例外：加载数据时获取 URL 失败
【发布时间】：2020-02-17 03:14:53
【问题描述】：

我正在尝试设置我的机器以运行 Tensorflow 2。我从未使用过 Tensorflow，只是下载了 Python 3.7。我不确定这是否是我的机器的问题。我按照TensorFlow's website 上列出的安装说明进行操作。我按照安装说明进行操作，似乎一切正常。

MacOS 10.15.3

Python 3.7

张量流 2

我创建了一个小程序来测试一些东西。这就是我所拥有的：

import io
import matplotlib.pyplot as plt
import tensorflow as tf
from tensorflow import keras
import numpy as np

data = keras.datasets.fashion_mnist

(train_images, train_labels), (test_images, test_labels) = data.load_data()

当我运行 data.load_data() 时，我收到此错误：

Downloading data from https://storage.googleapis.com/tensorflow/tf-keras-datasets/train-labels-idx1-ubyte.gz
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1317, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1244, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1290, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1239, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 966, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1414, in connect
    server_hostname=server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 423, in wrap_socket
    session=session
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 870, in _create
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 1139, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tensorflow/python/keras/utils/data_utils.py", line 263, in get_file
    urlretrieve(origin, fpath, dl_progress)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 247, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 543, in _open
    '_open', req)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1360, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1319, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/jacksonmelcher/Development/Personal/TensorFlow/tf_embeddings.py", line 12, in <module>
    (train_images, train_labels), (test_images, test_labels) = data.load_data()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tensorflow/python/keras/datasets/fashion_mnist.py", line 75, in load_data
    paths.append(get_file(fname, origin=base + fname, cache_subdir=dirname))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tensorflow/python/keras/utils/data_utils.py", line 267, in get_file
    raise Exception(error_msg.format(origin, e.errno, e.reason))
Exception: URL fetch failure on https://storage.googleapis.com/tensorflow/tf-keras-datasets/train-labels-idx1-ubyte.gz: None -- [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)

再次，这是我第一次使用 Tensorflow 和 Keras，但这似乎是与 google 的 api 服务的连接问题。

任何帮助将不胜感激，因为我找不到任何东西。

【问题讨论】：

相同的代码与我的网络完美配合。这可能是您的网络问题。
我改变了我的网络，我得到了同样的错误。我可能应该尝试卸载和全新安装 python

标签： python-3.x tensorflow keras python-3.7 tensorflow2.0

【解决方案1】：

您可以尝试使用 Chrome 访问 this link is dataset of 下载数据集然后更改您的代码

(train_images, train_labels), (test_images, test_labels) = data.load_data()

作为

(train_images, train_labels), (test_images, test_labels) = data.load_data(path='the file path you download')

希望能帮到你！

【讨论】：