"""
Stages under which nodes are categorized.  Listed in this
module to avoid typing the wrong string.
"""

INPUT = "input"
OUTPUT = "output"
FILTER_BINARY = "filter_binary"
FILTER_GRAY = "filter_gray"
BINARIZE = "binarize"
PAGE_SEGMENT = "page_segment"
RECOGNIZE = "recognize"
UTILS = "utils"
POST = "post_process"
