Countdown arithmetic-reasoning dataset in verl RL format. Given 4 numbers, reach the target using +, -, *, /.
Numbers per problem: 4, integer values in 1..10
Target range: 0..50
Splits: train = 327,680 rows, test = 1,024 rows
Columns: target, nums, data_source, prompt, ability, reward_model, extra_info
from datasets import load_dataset
ds = load_dataset("gaijingchu/countdown-") # see repo id
