Error: zipfile.BadZipFile: File is not a zip file

[HamzaGbada]

Issue Description:
While running the run.py, an error occurred where the file http://212.129.155.247/embedding/elmo_en_Original.zip was not found in the cache. The script attempted to download the file, but only downloaded a portion of it before encountering an error. When attempting to unzip the downloaded file, the script found that it was not a valid zip file and raised a BadZipFile exception.

Steps to reproduce:

1. Run the run.py script.

2. Wait until the script attempts to download the file http://212.129.155.247/embedding/elmo_en_Original.zip.

3. The error occurs when attempting to unzip the downloaded file.

Error Message:

build dataset: 100% 9/9 [00:00<00:00, 53468.46it/s]
build dataset: 100% 9/9 [00:00<00:00, 69647.11it/s]
http://212.129.155.247/embedding/elmo_en_Original.zip not found in cache, downloading to /tmp/tmpdw911a4u
 47% 163M/347M [1:29:31<1:41:31, 30.3kB/s]
Finish download from http://212.129.155.247/embedding/elmo_en_Original.zip
File is not a zip file
Traceback (most recent call last):
  File "/content/SANER/train_bert_elmo_en.py", line 150, in <module>
    data_bundle, embed, train_feature_data, dev_feature_data, test_feature_data, feature2id, id2feature = load_data()
  File "/content/SANER/fastNLP/core/utils.py", line 155, in wrapper
    results = func(*args, **kwargs)
  File "/content/SANER/train_bert_elmo_en.py", line 139, in load_data
    embed = ElmoEmbedding(vocab=data.get_vocab('chars'), model_dir_or_name=elmo_model, layers='mix', requires_grad=False,
  File "/content/SANER/fastNLP/embeddings/elmo_embedding.py", line 70, in __init__
    model_dir = cached_path(model_url, name='embedding')
  File "/content/SANER/fastNLP/io/file_utils.py", line 171, in cached_path
    return get_from_cache(url_or_filename, Path(data_cache))
  File "/content/SANER/fastNLP/io/file_utils.py", line 425, in get_from_cache
    raise e
  File "/content/SANER/fastNLP/io/file_utils.py", line 396, in get_from_cache
    unzip_file(Path(temp_filename), Path(uncompress_temp_dir))
  File "/content/SANER/fastNLP/io/file_utils.py", line 448, in unzip_file
    with ZipFile(file, "r") as zipObj:
  File "/usr/lib/python3.9/zipfile.py", line 1266, in __init__
    self._RealGetContents()
  File "/usr/lib/python3.9/zipfile.py", line 1333, in _RealGetContents
    raise BadZipFile("File is not a zip file")
zipfile.BadZipFile: File is not a zip file```

**Note:** the download of the file `elmo_en_Original.zip` from `http://212.129.155.247/embedding/elmo_en_Original.zip` takes too much time even with good internet speed, which may corrupted the file. (The averge download speed is `20KB/s`)