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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def labels():
 """ Path to labels file """

    datapath = path.join(path.dirname(path.realpath(__file__)), path.pardir)
    datapath = path.join(datapath, '../gzoo_data', 'train_solution.csv')
    return path.normpath(datapath)