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#!/usr/bin/env python2
import cdec
import sys, argparse
def hg2json(hg, weights):
"""
output a JSON representation of a cdec hypegraph
(see http://aclweb.org/aclwiki/index.php?title=Hypergraph_Format )
"""
res = ''
res += "{\n"
res += '"weights":{'+"\n"
a = []
for i in weights:
if i[1] != 0:
a.append( '"%s":%s'%(i[0], i[1]) )
res += ", ".join(a)+"\n"
res += "},\n"
res += '"nodes":'+"\n"
res += "[\n"
a = []
a.append( '{ "id":-1, "cat":"root", "span":[-1,-1] }' )
for i in hg.nodes:
a.append('{ "id":%d, "cat":"%s", "span":[%d,%d] }'%(i.id, i.cat, i.span[0], i.span[1]))
res += ",\n".join(a)+"\n"
res += "],\n"
res += '"edges":'+"\n"
res += "[\n"
a = []
for i in hg.edges:
s = "{"
s += '"head":%d'%(i.head_node.id)
s += ', "rule":"%s"'%(i.trule)
# f
xs = ' "f":{'
b = []
for j in i.feature_values:
b.append( '"%s":%s'%(j[0], j[1]) )
xs += ", ".join(b)
xs += "},"
# tails
if len(list(i.tail_nodes)) > 0:
s += ', "tails":[ %s ],'%(",".join([str(n.id) for n in i.tail_nodes]))
else:
s += ', "tails":[ -1 ],'
s += xs
s += ' "weight":%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 proper 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')
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()
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)
if __name__=="__main__":
main()
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