Need makedirs call for .vector_cache when path to custom embeddings is passed to Vectors init

[zhzhang]

text/torchtext/vocab.py

Line 256 in 4ecb8d8

os.makedirs(cache)

The makedirs call here needs to be moved to just before the cache is written to. Otherwise, if you specify a custom pre-trained embeddings file, it will error with

No such file or directory: u'.vector_cache/wiki_en.emb.pt'.

[domaala]

@zhzhang I might be missing something, but I haven't been able to reproduce the exception. Could you please provide your code snippet and exactly what folders and files exist at the time? Thanks.