運行mmdetection遇到的坑

1.需要注意的地方，要求torch>=1.1，同時torch跟cuda有版本對應限制，這個一定要注意。我先安裝的0.4.0，不行，又裝了1.4.0，但是版本要求的cuda太高了，我又重新裝回到1.0.0，正好對應我的cuda-9.0，萬萬沒想到程序要求的是大於1.1.0。耗費兩三個小時。

cuda與pytorch版本不匹配問題，先看cuda是什麼版本的，再去找對應的torch版本進行安裝。

https://blog.csdn.net/weixin_36670529/article/details/101211975

當然在這個過程中，很可能會碰上這個bug，因爲網速太慢，而導致下載失敗

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/urllib3/response.py", line 397, in _error_catcher
    yield
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/urllib3/response.py", line 479, in read
    data = self._fp.read(amt)
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/cachecontrol/filewrapper.py", line 62, in read
    data = self.__fp.read(amt)
  File "/usr/lib/python3.5/http/client.py", line 458, in read
    n = self.readinto(b)
  File "/usr/lib/python3.5/http/client.py", line 498, in readinto
    n = self.fp.readinto(b)
  File "/usr/lib/python3.5/socket.py", line 575, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib/python3.5/ssl.py", line 929, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib/python3.5/ssl.py", line 791, in read
    return self._sslobj.read(len, buffer)
  File "/usr/lib/python3.5/ssl.py", line 575, 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 "/usr/local/lib/python3.5/dist-packages/pip/_internal/cli/base_command.py", line 188, in main
    status = self.run(options, args)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/commands/install.py", line 345, in run
    resolver.resolve(requirement_set)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/legacy_resolve.py", line 196, in resolve
    self._resolve_one(requirement_set, req)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/legacy_resolve.py", line 359, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/legacy_resolve.py", line 307, in _get_abstract_dist_for
    self.require_hashes
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/operations/prepare.py", line 199, in prepare_linked_requirement
    progress_bar=self.progress_bar
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 1064, in unpack_url
    progress_bar=progress_bar
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 924, in unpack_http_url
    progress_bar)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 1152, in _download_http_url
    _download_url(resp, link, content_file, hashes, progress_bar)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 861, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/utils/hashes.py", line 75, in check_against_chunks
    for chunk in chunks:
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 829, in written_chunks
    for chunk in chunks:
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/utils/ui.py", line 156, in iter
    for x in it:
  File "/usr/local/lib/python3.5/dist-packages/pip/_internal/download.py", line 818, in resp_read
    decode_content=False):
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/urllib3/response.py", line 531, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/urllib3/response.py", line 496, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "/usr/lib/python3.5/contextlib.py", line 77, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/urllib3/response.py", line 402, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='pypi.tuna.tsinghua.edu.cn', port=443): Read timed out.

另外也有時間限制，把時間限制從100改成1000就可以了。

解決方法如下所示：

sudo /usr/bin/python3.5 -m pip install  --default-timeout=1000 --no-cache-dir torch==1.1.0 -i https://pypi.tuna.tsinghua.edu.cn/simple

清華源不行就換成阿里源，下個破torch折騰了三個小時了 ：

sudo /usr/bin/python3.5 -m pip install  --default-timeout=1000 --no-cache-dir torch==1.1.0 -i https://mirrors.aliyun.com/pypi/simple

2.看bug來說應該是有些輔助庫沒有裝上

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

解決blog有：

https://blog.csdn.net/cczxsong/article/details/94647878

看了很多方法，都是採用

sudo apt-get install python3.5-dev

其他人採用這一條就可以，我的程序採用之後無法解決，中間的版本號根據自己的python版本來改動。