from pathlib import Path
import gzip,json
SPLITS={'train','validation','id','long','counterfactual'}
def iter_rows(split:str):
 if split not in SPLITS:raise ValueError('Unknown source split')
 with gzip.open(Path(__file__).resolve().parent/'data'/f'{split}.jsonl.gz','rt',encoding='utf-8') as f:
  for line in f:yield json.loads(line)