Glove loader - Code changes and unit tests.

1. Added methods to download, extract and load glove vectors.
2. Added units tests to test the public methods.

Other changes
 1. Made download and extract methods private.
 2. Refactored Word2vec unit tests to exclude private methods.

tests/unit/test_word_embeddings.py

@@ -39,6 +39,7 @@ def test_load_pretrained_vectors_word2vec():
 
     shutil.rmtree(os.path.join(os.getcwd(), dir_path))
 
+    assert isinstance(load_word2vec(dir_path), Word2VecKeyedVectors)
 
 def test_load_pretrained_vectors_glove():
     dir_path = "temp_data/"

utils_nlp/pretrained_embeddings/glove.py

@@ -87,7 +87,6 @@ def load_pretrained_vectors(dir_path, file_name="glove.840B.300d.txt", limit=Non
 
     Returns:
         gensim.models.keyedvectors.Word2VecKeyedVectors: Loaded word2vectors
-
     """
 
     file_path = _maybe_download_and_extract(dir_path, file_name)