def METHOD_NAME(
    cameras: PerspectiveCameras,
    image_size: torch.Tensor,
) -> torch.Tensor:
    """
    Convert PyTorch3D `PerspectiveCameras` to Pulsar style camera parameters.
    Note:
        * Pulsar does NOT support different focal lengths for x and y.
          For conversion, we use the average of fx and fy.
        * The Pulsar renderer MUST use a left-handed coordinate system for this
          mapping to work.
        * The resulting image will be vertically flipped - which has to be
          addressed AFTER rendering by the user.
    Args:
        cameras: A batch of `N` cameras in the PyTorch3D convention.
        image_size: A tensor of shape `(N, 2)` containing the sizes of the images
            (height, width) attached to each camera.
    Returns:
        cameras_pulsar: A batch of `N` Pulsar camera vectors in the Pulsar
            convention `(N, 13)` (3 translation, 6 rotation, focal_length, sensor_width,
            c_x, c_y).
    """
    return _pulsar_from_cameras_projection(cameras, image_size)