安装TensorFlow是出现这种情况

   ERROR: Exception:
Traceback (most recent call last):
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/cli/base_command.py", line 178, in main
    status = self.run(options, args)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/commands/install.py", line 352, in run
    resolver.resolve(requirement_set)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/resolve.py", line 131, in resolve
    self._resolve_one(requirement_set, req)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/resolve.py", line 294, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/resolve.py", line 242, in _get_abstract_dist_for
    self.require_hashes
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/operations/prepare.py", line 347, in prepare_linked_requirement
    progress_bar=self.progress_bar
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 886, in unpack_url
    progress_bar=progress_bar
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 746, in unpack_http_url
    progress_bar)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 954, in _download_http_url
    _download_url(resp, link, content_file, hashes, progress_bar)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 683, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/utils/hashes.py", line 62, in check_against_chunks
    for chunk in chunks:
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 651, in written_chunks
    for chunk in chunks:
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/utils/ui.py", line 156, in iter
    for x in it:
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_internal/download.py", line 640, in resp_read
    decode_content=False):
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_vendor/urllib3/response.py", line 494, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_vendor/urllib3/response.py", line 459, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/wangjie/.local/lib/python2.7/site-packages/pip/_vendor/urllib3/response.py", line 374, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.