cdec2json.py

1 files changed, 100 insertions, 0 deletions

diff --git a/example/cdec2json.py b/example/cdec2json.py
new file mode 100755
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+++ b/example/cdec2json.py
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+#!/usr/bin/env python2
+
+import cdec
+import sys, argparse
+import json
+import gzip
+
+
+#FIXME new format
+# strings?
+# map?
+def hg2json(hg, weights):
+  """
+  output a JSON representation of a cdec hypegraph
+  """
+  res = ''
+  res += "{\n"
+  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"
+  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"
+  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))))
+    # 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+1) for n in i.tail_nodes]))
+    else:
+      s += ', "tails":[ 0 ],'
+    #s += xs
+    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 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')
+  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)
+
+
+if __name__=="__main__":
+  main()
+