Add optimization for compute_bleu precision initialization (#257)

* Add optimization for compute_bleu precision initialization

* Remove redundant else clause

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Co-authored-by: ErnestsLavrinovicsalias] <[email protected]>

Author: ernlavr

sacrebleu/metrics/bleu.py

@@ -245,13 +245,12 @@ def compute_bleu(correct: List[int],
             smooth_value = BLEU.SMOOTH_DEFAULTS[smooth_method]
 
         # Compute brevity penalty
+        bp = 1.0
         if sys_len < ref_len:
-            bp = math.exp(1 - ref_len / sys_len) if sys_len > 0 else 0.0
-        else:
-            bp = 1.0
+            bp = math.exp(1 - ref_len / sys_len) if sys_len > 0 else 0.0            
 
         # n-gram precisions
-        precisions = [0.0 for x in range(max_ngram_order)]
+        precisions = [0.0] * max_ngram_order
 
         # Early stop if there are no matches (#141)
         if not any(correct):