fix: prevent OSError: read-only file system error

[daun-io]

Description

I found that there is a chance of OSError to occur when we try to load models into a temporary directory such as in the strictly managed environment like some containers on the cloud.

[2022-03-23 04:07:37,080] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     review_scoring_model = Pororo(task="review", lang="ko")
[2022-03-23 04:07:37,080] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/pororo.py", line 203, in __new__
[2022-03-23 04:07:37,080] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     task_module = SUPPORTED_TASKS[task](
[2022-03-23 04:07:37,080] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/tasks/review_scoring.py", line 86, in load
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     model = (BrainRobertaModel.load_model(
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/models/brainbert/BrainRoBERTa.py", line 33, in load_model
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     ckpt_dir = download_or_load(model_name, lang)
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/tasks/utils/download_utils.py", line 318, in download_or_load
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     return download_or_load_bert(info)
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/tasks/utils/download_utils.py", line 104, in download_or_load_bert
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     type_dir = download_from_url(
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/pororo/tasks/utils/download_utils.py", line 288, in download_from_url
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     wget.download(url, type_dir)
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/site-packages/wget.py", line 506, in download
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     (fd, tmpfile) = tempfile.mkstemp(".tmp", prefix=prefix, dir=".")
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/tempfile.py", line 331, in mkstemp
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     return _mkstemp_inner(dir, prefix, suffix, flags, output_type)
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]   File "/usr/local/lib/python3.8/tempfile.py", line 250, in _mkstemp_inner
[2022-03-23 04:07:37,081] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000]     fd = _os.open(file, flags, 0o600)
[2022-03-23 04:07:37,082] {ecs.py:362} INFO - [2022-03-23T04:07:12.901000] OSError: [Errno 30] Read-only file system: './brainbert.base.ko.review_rating.zip4zkvg88b.tmp'

This commit will prevent that to happen. The code for the new function 'download' is originated from wget library written by anatoly techtonik with slight revision done by me.