def dump_config(config):
    """Given a relaxation configuration and an accompanying description
    map, returning a human-readable string describing it.
    """
    optimizations = [r for r in config if r[1]]
    if not optimizations:
        return u'no optimizations'

    out = []
    for ident, param in optimizations:
        out.append(u'{} @ {}'.format(ident, param))
    return u', '.join(out)