我正在尝试使用以下命令在ubuntu 19.04上安装pytorch：

pip3 install torch

但显示以下错误：

Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/_internal/cli/base_command.py",line 143,in main
    status = self.run(options,args)
  File "/usr/lib/python3/dist-packages/pip/_internal/commands/install.py",line 338,in run
    resolver.resolve(requirement_set)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py",line 102,in resolve
    self._resolve_one(requirement_set,req)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py",line 256,in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py",line 209,in _get_abstract_dist_for
    self.require_hashes
  File "/usr/lib/python3/dist-packages/pip/_internal/operations/prepare.py",line 283,in prepare_linked_requirement
    progress_bar=self.progress_bar
  File "/usr/lib/python3/dist-packages/pip/_internal/download.py",line 836,in unpack_url
    progress_bar=progress_bar
  File "/usr/lib/python3/dist-packages/pip/_internal/download.py",line 673,in unpack_http_url
    progress_bar)
  File "/usr/lib/python3/dist-packages/pip/_internal/download.py",line 868,in _download_http_url
    stream=True,File "/usr/share/python-wheels/requests-2.21.0-py2.py3-none-any.whl/requests/sessions.py",line 546,in get
    return self.request('GET',url,**kwargs)
  File "/usr/lib/python3/dist-packages/pip/_internal/download.py",line 396,in request
    return super(PipSession,self).request(method,*args,**kwargs)
  File "/usr/share/python-wheels/requests-2.21.0-py2.py3-none-any.whl/requests/sessions.py",line 533,in request
    resp = self.send(prep,**send_kwargs)
  File "/usr/share/python-wheels/requests-2.21.0-py2.py3-none-any.whl/requests/sessions.py",line 646,in send
    r = adapter.send(request,**kwargs)
  File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/adapter.py",line 37,in send
    cached_response = self.controller.cached_request(request)
  File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/controller.py",line 111,in cached_request
    resp = self.serializer.loads(request,cache_data)
  File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/serialize.py",line 114,in loads
    return getattr(self,"_loads_v{0}".format(ver))(request,data)
  File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/serialize.py",line 176,in _loads_v2
    cached = json.loads(zlib.decompress(data).decode("utf8"))
zlib.error: Error -5 while decompressing data: incomplete or truncated stream 

我想知道问题是来自pip3还是来自python。

我的python3版本是3.7.3

我们非常感谢您的帮助。