def _build_tree_from_nps(tokens, nps):
'''
build nltk Tree from tokens and nps
tokens: list of tokens
nps: list of noun phrases
'''
tokens = [t.lower() for t in tokens]
result = []
list_np_tokens = []
for np in nps:
list_np_tokens.append(np.split())
# build nested list
# logging.info(list_np_tokens)
while len(list_np_tokens)>0:
nps_tokens = list_np_tokens.pop(0)
s_index = subsequence(nps_tokens, tokens)
result.extend(tokens[:s_index])
result.append(nps_tokens)
tokens = tokens[s_index+len(nps_tokens):]
result.extend(tokens)
tree_list = []
for ele in result:
if isinstance(ele, str):
tree_list.append(ele)
else:
tree_list.append(Tree('NP', ele))
np_chunk = Tree('S', tree_list)
return np_chunk