fix: word2vec_utils typo not compiling

examples/word2vec_utils.py

@@ -1,4 +1,4 @@
-xfrom collections import Counter
+from collections import Counter
 import random
 import os
 import sys
@@ -81,4 +81,4 @@ def batch_gen(download_url, expected_byte, vocab_size, batch_size,
         target_batch = np.zeros([batch_size, 1])
         for index in range(batch_size):
             center_batch[index], target_batch[index] = next(single_gen)
-        yield center_batch, target_batch
+        yield center_batch, target_batch