im2rec.py: error: the following arguments are required: prefix, root

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im2rec.py: error: the following arguments are required: prefix, root

cgroup.add_argument('--list', action='store_true',
                        help='If this is set im2rec will create image list(s) by traversing root folder\
        and output to <prefix>.lst.\
        Otherwise im2rec will read <prefix>.lst and create a database at <prefix>.rec')