windows中pip下载过慢或报错 Read timed out

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Win10安装Tensorflow出错：socket.timeout: The read operation timed out Windows10系统用pip3安装Tensorflow指定版本（之前安装的2.1.0版本太高了）： (tensorflow) C:\Users\XXX>pip3 install tensorflow==1.2.1 出错： WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status... 阅读详情

pip默认使用国外源，下载速度贼慢，甚至报错：

C:\Users\MARS>python -m pip install --user pygal==1.7
Collecting pygal==1.7
  Downloading pygal-1.7.0.tar.gz (737 kB)
     |████                            | 92 kB 2.2 kB/s eta 0:04:47ERROR: Exception:
Traceback (most recent call last):
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\urllib3\response.py", line 437, in _error_catcher
    yield
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\urllib3\response.py", line 519, in read
    data = self._fp.read(amt) if not fp_closed else b""
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 62, in read
    data = self.__fp.read(amt)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 449, in read
    n = self.readinto(b)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 493, in readinto
    n = self.fp.readinto(b)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\socket.py", line 586, in readinto
    return self._sock.recv_into(b)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\ssl.py", line 1009, in recv_into
    return self.read(nbytes, buffer)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\ssl.py", line 871, in read
    return self._sslobj.read(len, buffer)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\ssl.py", line 631, in read
    v = self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\cli\base_command.py", line 216, in _main
    status = self.run(options, args)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\cli\req_command.py", line 182, in wrapper
    return func(self, options, args)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\commands\install.py", line 325, in run
    reqs, check_supported_wheels=not options.target_dir
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 183, in resolve
    discovered_reqs.extend(self._resolve_one(requirement_set, req))
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 388, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 340, in _get_abstract_dist_for
    abstract_dist = self.preparer.prepare_linked_requirement(req)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\operations\prepare.py", line 469, in prepare_linked_requirement
    hashes=self._get_linked_req_hashes(req)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\operations\prepare.py", line 259, in unpack_url
    hashes=hashes,
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\operations\prepare.py", line 130, in get_http_url
    link, downloader, temp_dir.path, hashes
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\operations\prepare.py", line 282, in _download_http_url
    for chunk in download.chunks:
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\cli\progress_bars.py", line 168, in iter
    for x in it:
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_internal\network\utils.py", line 88, in response_chunks
    decode_content=False,
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\urllib3\response.py", line 576, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\urllib3\response.py", line 541, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\contextlib.py", line 99, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\Users\MARS\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pip\_vendor\urllib3\response.py", line 442, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

此时切换国内源即可，输入命令：

pip install pip -U

pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

输入命令后，再进行install，秒完成。

C:\Users\MARS>python -m pip install --user pygal==1.7
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting pygal==1.7
  Downloading https://pypi.tuna.tsinghua.edu.cn/packages/a9/2a/4c07302157297054cf21e2166c05f2ab77d95da3101988856cb0eae62919/pygal-1.7.0.tar.gz (737 kB)
     |████████████████████████████████| 737 kB 1.7 MB/s
Building wheels for collected packages: pygal
  Building wheel for pygal (setup.py) ... done
  Created wheel for pygal: filename=pygal-1.7.0-py3-none-any.whl size=789251 sha256=cec7d590138507d1e6192871b6129484ec6dc502fe16f85b4aa66dfc45f20193
  Stored in directory: c:\users\mars\appdata\local\pip\cache\wheels\93\d3\29\86efeeccad77fa0960f2116ecaf0ea4830f728008895f56a1d
Successfully built pygal
Installing collected packages: pygal
Successfully installed pygal-1.7.0

 

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京东风控算法工程师带你解读Action Model-精细化运营（上篇） 电影《蝴蝶效应》中，男主拥有回到童年改变过去的能力，虽然在剧中男主一次次穿越时空拯救世界，但由于他无法预见自己做出的抉择对未来产生的其他影响，最终还是没能阻止悲剧的发生。可见，一个好的决策需要衡量其对未来产生的影响。JDD风控算法团队本期为大家解惑最优决策难题的解决方法-Action Model。 阅读详情

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plot(cnn.rL);assert(er<0.12, 'Too big error');```Example: Neural Networks---------------------```matlabfunction test_example_NNload mnist_uint8;train_x = double(train_x) / 255;test_x = double(test_x) / 255;train_y = double(train_y);test_y = double(test_y);% normalize[train_x, mu, sigma] = zscore(train_x);test_x = normalize(test_x, mu, sigma);%% ex1 vanilla neural netrand('state',0)nn = nnsetup([784 100 10]);opts.numepochs = 1; % Number of full sweeps through dataopts.batchsize = 100; % Take a mean gradient step over this many samples[nn, L] = nntrain(nn, train_x, train_y, opts);[er, bad] = nntest(nn, test_x, test_y);assert(er < 0.08, 'Too big error');%% ex2 neural net with L2 weight decayrand('state',0)nn = nnsetup([784 100 10]);nn.weightPenaltyL2 = 1e-4; % L2 weight decayopts.numepochs = 1; % Number of full sweeps through dataopts.batchsize = 100; % Take a mean gradient step over this many samplesnn = nntrain(nn, train_x, train_y, opts);[er, bad] = nntest(nn, test_x, test_y);assert(er < 0.1, 'Too big error');%% ex3 neural net with dropoutrand('state',0)nn = nnsetup([784 100 10]);nn.dropoutFraction = 0.5; 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