Source code for oumi.builders.rollouts

# Copyright 2025 - Oumi
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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from typing import Callable, Optional

from oumi.core.configs import TrainingParams
from oumi.core.registry import REGISTRY



[docs]
def build_rollout_function(config: TrainingParams) -> Optional[Callable]:
    """Builds the rollout function."""
    if config.grpo.rollout_function is None:
        return None
    # Import to ensure GRPO rollout functions are added to REGISTRY.
    import oumi.datasets.grpo.rollouts as grpo_rollouts  # noqa: F401

    rollout_function = REGISTRY.get_rollout_function(config.grpo.rollout_function)
    if not rollout_function:
        raise KeyError(
            f"rollout_function `{config.grpo.rollout_function}` "
            "was not found in the registry."
        )
    return rollout_function