typo

pytorch_pretrained_bert/tokenization.py

@@ -63,7 +63,7 @@ def load_vocab(vocab_file):
 
 
 def whitespace_tokenize(text):
-    """Runs basic whitespace cleaning and splitting on a peice of text."""
+    """Runs basic whitespace cleaning and splitting on a piece of text."""
     text = text.strip()
     if not text:
         return []