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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 get_index2latex(model_description):
 """ Get a dictionary that maps indices to LaTeX commands. Parameters model_description : string A model description file that points to a feature folder where an `index2formula_id.csv` has to be. Returns ------- dictionary : Maps indices to LaTeX commands """

    index2latex = {}
    translation_csv = os.path.join(get_project_root(),
                                   model_description["data-source"],
                                   "index2formula_id.csv")
    with open(translation_csv) as csvfile:
        csvreader = csv.DictReader(csvfile, delimiter=',', quotechar='"')
        for row in csvreader:
            index2latex[int(row['index'])] = row['latex']
    return index2latex