Dataset Version Manager

from typing import Dict, Optional, Any
from collections import namedtuple

# Version tuple for specifying load and save versions
Version = namedtuple('Version', ['load', 'save'])

class VersionedDataset:
    """A dataset wrapper that supports versioning."""

    def __init__(self, filepath: str):
        """
        Initialize a versioned dataset.

        Args:
            filepath: Base filepath for the dataset
        """
        pass

    def load(self, version: Optional[str] = None) -> Any:
        """
        Load data from a specific version or the latest version.

        Args:
            version: Version to load. If None, loads the latest version.

        Returns:
            The loaded data

        Raises:
            ValueError: If the specified version doesn't exist
        """
        pass

    def save(self, data: Any, version: Optional[str] = None) -> str:
        """
        Save data with a specific version or auto-generate a version.

        Args:
            data: Data to save
            version: Version string to use. If None, generates timestamp-based version.

        Returns:
            The version string used for saving
        """
        pass

    def list_versions(self) -> list[str]:
        """
        List all available versions for this dataset.

        Returns:
            List of version strings, sorted newest to oldest
        """
        pass

def run_pipeline(
    datasets: Dict[str, VersionedDataset],
    pipeline_func: callable,
    load_versions: Optional[Dict[str, str]] = None,
    save_version: Optional[str] = None
) -> Dict[str, str]:
    """
    Run a pipeline with specified load and save versions.

    Args:
        datasets: Dictionary of dataset names to VersionedDataset objects
        pipeline_func: Function that takes loaded data and returns output data
        load_versions: Optional dict mapping dataset names to versions to load
        save_version: Optional version string to use for all saved outputs

    Returns:
        Dictionary mapping output dataset names to the versions they were saved with
    """
    pass