Update eval.py

eval.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import argparse
+import os
 import re
 from typing import Dict
 
@@ -131,6 +132,7 @@ def main(args):
         attribute, value = list(map(str.strip, args.filter.split(":")))
         dataset = dataset.filter(
             lambda x: x[attribute] == value,
+            num_proc=os.cpu_count() // 2,
             desc=f"Filtering on {args.filter}",
         )
     # for testing: only process the first two examples as a test