diff --git a/codebleu/bleu.py b/codebleu/bleu.py
index 8db2e7a..5bb2c9a 100644
--- a/codebleu/bleu.py
+++ b/codebleu/bleu.py
@@ -9,10 +9,7 @@
 
 """BLEU score implementation."""
 import math
-import sys
-import warnings
 from collections import Counter
-from typing import Any
 
 from .utils import ngrams
 
diff --git a/codebleu/weighted_ngram_match.py b/codebleu/weighted_ngram_match.py
index 3f37914..d651d7c 100644
--- a/codebleu/weighted_ngram_match.py
+++ b/codebleu/weighted_ngram_match.py
@@ -13,11 +13,8 @@
 """BLEU score implementation."""
 
 import math
-import sys
-import warnings
 from collections import Counter
 
-from .bleu import modified_precision
 from .utils import ngrams