def get_least_key(kv):
    """
    Given a dictionary, returns the key with minimum value.
    :param kv: Dictionary considered.
    :return: Key with the minimum value.
    """
    min_k = None
    min_v = None
    for k, v in kv.items():
        if min_v is None or v.item() < min_v:
            min_k = k
            min_v = v.item()

    return min_k