def ioi_code_reward(completions, test_batch_size: int = 1, provider_type: str = "piston", **kwargs) -> list[float]:
    """Reward function that evaluates IOI problems using a specified execution client.

    Assumes the dataset has the same format as hf.co/datasets/open-r1/ioi

    Args:
        completions: List of model completions to evaluate
        test_batch_size: Evaluate these many test cases in parallel, then check if any of them failed (0 score):
                       if so stop evaluating; otherwise continue with the next batch of test cases.
        provider_type: The execution provider to use (default: "piston"). Supported values: "piston", "morph"
        **kwargs: Additional arguments passed from the dataset
    """
    # Get the appropriate client based on provider_type
    if provider_type == "morph":
        execution_client = get_morph_client_from_env()
    else:
        # for info on setting up piston workers, see slurm/piston/README.md
        execution_client = get_piston_client_from_env()

    code_snippets = [
        # note: grading is automatically skipped if no code is extracted
        add_includes(extract_code(completion[-1]["content"], "cpp"), problem_id)
        for completion, problem_id in zip(completions, kwargs["id"])
    ]

    async def run_catch_exceptions(task):
        try:
            return await task
        except Exception as e:
            print(f"Error from {provider_type} worker: {e}")
            return SubtaskResult()

    problems_data = [dict(zip(kwargs.keys(), values)) for values in zip(*kwargs.values())]

    loop = _init_event_loop()
    evals = [
        loop.create_task(
            run_catch_exceptions(
                score_subtask(
                    execution_client,
                    problem_data,
                    code,
                    test_batch_size=test_batch_size,
                )
            )
        )
        for problem_data, code in zip(problems_data, code_snippets)
    ]
    results = loop.run_until_complete(asyncio.gather(*evals))

    return [result.score for result in results]
Reward function that evaluates IOI problems using a specified execution client.

    Assumes the dataset has the same format as hf.co/datasets/open-r1/ioi

    Args:
        completions: List of model completions to evaluate
        test_batch_size: Evaluate these many test cases in parallel, then check if any of them failed (0 score):
                       if so stop evaluating; otherwise continue with the next batch of test cases.
        provider_type: The execution provider to use (default: "piston"). Supported values: "piston", "morph"
        **kwargs: Additional arguments passed from the dataset
    
src/open_r1/rewards.py