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#!/usr/bin/env python2
import cdec
import sys, argparse
import json, gzip
def hg2json(hg, weights):
"""
hackishly output a JSON representation of a cdec hypegraph
TODO: cdec now uses boost's serialization instead of JSON
(github repo @b88176dc4fd53480e77d601ff63bf5300cf8fc7f
still uses the old format)
"""
res = ''
res += "{\n"
# rules
res += '"rules":[\n'
rules = []
for i in hg.edges:
s = json.dumps(str(i.trule))
try:
rules.index(s)
except:
rules.append(s)
res += ",\n".join(rules)
res += "\n],\n"
# nodes
res += '"nodes":'+"\n"
res += "[\n"
a = []
a.append('{ "id":0, "symbol":"root", "span":[-1,-1] }')
for i in hg.nodes:
a.append('{ "id":%d, "symbol":"%s", "span":[%d,%d] }'%(i.id+1, i.cat, i.span[0], i.span[1]))
res += ",\n".join(a)+"\n"
res += "],\n"
# edges
res += '"edges":'+"\n"
res += "[\n"
a = []
for i in hg.edges:
s = "{"
s += '"head":%d'%(i.head_node.id+1)
s += ', "rule":%s'%(rules.index(json.dumps(str(i.trule))))
# tails
if len(list(i.tail_nodes)) > 0:
s += ', "tails":[ %s ],'%(",".join([str(n.id+1) for n in i.tail_nodes]))
else:
s += ', "tails":[ 0 ],'
s += ' "score":%s }'%(i.prob)
a.append(s)
res += ",\n".join(a)+"\n"
res += "]\n"
res += "}\n"
return res
def main():
parser = argparse.ArgumentParser(description='get a nice json representation of cdec hypergraphs')
parser.add_argument('-c', '--config', required=True, help='decoder configuration')
parser.add_argument('-w', '--weights', required=True, help='feature weights')
parser.add_argument('-g', '--grammar', required=False, help='grammar')
args = parser.parse_args()
with open(args.config) as config:
config = config.read()
decoder = cdec.Decoder(config)
decoder.read_weights(args.weights)
ins = sys.stdin.readline().strip()
if args.grammar:
if args.grammar.split('.')[-1] == 'gz':
with gzip.open(args.grammar) as grammar:
grammar = grammar.read()
else:
with open(args.grammar) as grammar:
grammar = grammar.read()
hg = decoder.translate(ins, grammar=grammar)
else:
hg = decoder.translate(ins)
sys.stderr.write("input:\n '%s'\n"%(ins))
sys.stderr.write("viterbi translation:\n '%s'\n"%(hg.viterbi()))
num_nodes = 0
for i in hg.nodes: num_nodes+=1
sys.stderr.write("# nodes = %s\n"%(num_nodes))
num_edges = 0
for i in hg.edges: num_edges+=1
sys.stderr.write("# edges = %s\n"%(num_edges))
sys.stderr.write("viterbi score = %s\n"%(round(hg.viterbi_features().dot(decoder.weights), 2)))
print hg2json(hg, decoder.weights).encode('utf-8')
if __name__=="__main__":
main()
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