braindecode bug记录1

目前问题有点多。先记录下来这个bug，日后解决（在Docker环境下）

在调试plot_bcic_iv_2a_moabb_trial.py时，出现以下error：

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/pudb/__init__.py", line 153, in runscript
    dbg._runscript(mainpyfile)
  File "/usr/local/lib/python3.6/dist-packages/pudb/debugger.py", line 468, in _runscript
    self.run(statement)
  File "/usr/lib/python3.6/bdb.py", line 434, in run
    exec(cmd, globals, locals)
  File "", line 1, in 
  File "plot_bcic_iv_2a_moabb_trial.py", line 41, in 
    dataset = MOABBDataset(dataset_name="BNCI2014001", subject_ids=[subject_id])
  File "/code/braindecode/datasets/moabb.py", line 95, in __init__
    raws, description = fetch_data_with_moabb(dataset_name, subject_ids)
  File "/code/braindecode/datasets/moabb.py", line 82, in fetch_data_with_moabb
    return _fetch_and_unpack_moabb_data(dataset, subject_id)
  File "/code/braindecode/datasets/moabb.py", line 28, in _fetch_and_unpack_moabb_data
    data = dataset.get_data(subject_ids)
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/base.py", line 104, in get_data
    data[subject] = self._get_single_subject_data(subject)
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/bnci.py", line 642, in _get_single_subject_data
    sessions = load_data(subject=subject, dataset=self.code, verbose=False)
  File "", line 20, in load_data
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/bnci.py", line 107, in load_data
    baseurl_list[dataset], verbose)
  File "", line 20, in _load_data_001_2014
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/bnci.py", line 131, in _load_data_001_2014
    filename = data_path(url, path, force_update, update_path)
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/bnci.py", line 24, in data_path
    dl.data_path(url, 'BNCI', path, force_update, update_path, verbose)
  File "", line 21, in data_path
  File "/usr/local/lib/python3.6/dist-packages/moabb/datasets/download.py", line 62, in data_path
    _fetch_file(url, destination, print_destination=False)
  File "", line 21, in _fetch_file
  File "/usr/local/lib/python3.6/dist-packages/mne/utils/fetching.py", line 122, in _fetch_file
    _get_http(url, temp_file_name, initial_size, timeout, verbose_bool)
  File "/usr/local/lib/python3.6/dist-packages/mne/utils/fetching.py", line 48, in _get_http
    response = request.urlopen(req).read()#response = request.urlopen(req).read(request.Request(url), timeout=timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

初步分析问题是由于 the great wall的限制访问不到moabb benchmark的数据集，故尝试离线下载并尝试load。dataloader函数入口未更新，解决方法为重写dataloader函数或在已有dataloader上做重定向载入local 数据集。日后解决~