What's the meaning of this client

[HUSTNO1WXY]

What's the meaning of SCANNET_CLIENT? In LoFTR_train part in github, I don't find that. I'm a newcomer of deep-learning, please bear with me

try:
    # for internel use only
    from .client import MEGADEPTH_CLIENT, SCANNET_CLIENT
except Exception:
    MEGADEPTH_CLIENT = SCANNET_CLIENT = None

def load_array_from_s3(
    path, client, cv_type,
    use_h5py=False,
):
    byte_str = client.Get(path)
    try:
        if not use_h5py:
            raw_array = np.fromstring(byte_str, np.uint8)
            data = cv2.imdecode(raw_array, cv_type)
        else:
            f = io.BytesIO(byte_str)
            data = np.array(h5py.File(f, 'r')['/depth'])
    except Exception as ex:
        print(f"==> Data loading failure: {path}")
        raise ex
    assert data is not None
    return data

[JiamingSuen]

This function is coupled with some infrastructure of the training cluster and is only meant to be used internally. Please just ignore it.