#156 related. Fixed bug: embedding won't be initialized from the empt…

…y sequence.

arekit/contrib/networks/embeddings/base.py

@@ -47,7 +47,7 @@ def from_word_embedding_pairs_iter(cls, word_embedding_pairs):
             matrix.append(vector)
             words.append(word)
 
-        return cls(matrix=np.array(matrix),
+        return cls(matrix=np.array(matrix) if len(matrix) > 0 else np.empty(shape=(0, 0)),
                    words=words)
 
     @classmethod

tests/contrib/networks/test_embedding.py

@@ -0,0 +1,21 @@
+import unittest
+
+from arekit.contrib.networks.embeddings.base import Embedding
+
+
+class TestModelNamesService(unittest.TestCase):
+
+    def test(self):
+        single_element = [("a", [1])]
+        e = Embedding.from_word_embedding_pairs_iter(iter(single_element))
+        print(e.VocabularySize)
+        print(e.VectorSize)
+
+    def test_empty(self):
+        e = Embedding.from_word_embedding_pairs_iter(iter([]))
+        print(e.VocabularySize)
+        print(e.VectorSize)
+
+
+if __name__ == '__main__':
+    unittest.main()