class Entity(object):
def __init__(self):
self.__coll_dbpedia = None
self.__coll_sf_facc = None
self.__coll_sf_dbpedia = None
self.__coll_fb2dbp = None
def __init_coll_dbpedia(self):
"""Makes connection to the entity (DBpedia) collection."""
if self.__coll_dbpedia is None:
self.__coll_dbpedia = Mongo(MONGO_HOST, MONGO_DB,
MONGO_COLLECTION_DBPEDIA)
def __init_coll_sf_facc(self):
"""Makes connection to the surface form collection."""
if self.__coll_sf_facc is None:
self.__coll_sf_facc = Mongo(MONGO_HOST, MONGO_DB,
MONGO_COLLECTION_SF_FACC)
def __init_coll_sf_dbpedia(self):
"""Makes connection to the surface form collection."""
if self.__coll_sf_dbpedia is None:
self.__coll_sf_dbpedia = Mongo(MONGO_HOST, MONGO_DB,
MONGO_COLLECTION_SF_DBPEDIA)
def __init_coll_fb2dbp(self):
"""Makes connection to Freebase2DBpedia collection."""
if self.__coll_fb2dbp is None:
self.__coll_fb2dbp = Mongo(MONGO_HOST, MONGO_DB,
MONGO_COLLECTION_FREEBASE2DBPEDIA)
def lookup_en(self, entity_id):
"""Looks up an entity by its identifier.
:param entity_id: entity identifier ("<dbpedia:Audi_A4>")
:return A dictionary with the entity document or None.
"""
self.__init_coll_dbpedia()
return self.__coll_dbpedia.find_by_id(entity_id)
def lookup_name_facc(self, name):
"""Looks up a name in a surface form dictionary and returns all candidate entities."""
self.__init_coll_sf_facc()
res = self.__coll_sf_facc.find_by_id(name)
return res if res else {}
def lookup_name_dbpedia(self, name):
"""Looks up a name in a surface form dictionary and returns all candidate entities."""
self.__init_coll_sf_dbpedia()
res = self.__coll_sf_dbpedia.find_by_id(name)
return res if res else {}
def fb_to_dbp(self, fb_id):
"""Converts Freebase id to DBpedia; it returns list of DBpedia IDs."""
self.__init_coll_fb2dbp()
res = self.__coll_fb2dbp.find_by_id(fb_id)
return res["!<owl:sameAs>"] if res else None
def create_sample_file(self):
"""Creates a sample file from the context of index"""
mongo = Mongo(MONGO_HOST, MONGO_DB, MONGO_COLLECTION_DBPEDIA)
example_docs = [
"<dbpedia:Texhoma,_Oklahoma>", "<dbpedia:Karen_Spärck_Jones>",
"<dbpedia:Audi_A4>", "<dbpedia:Barack_Obama>"
]
doc_contents = {}
for docid in example_docs:
doc_contents[docid] = self.get_doc_content(mongo.find_by_id(docid))
json.dump(doc_contents,
open("output/example_docs.json", "w"),
indent=4,
sort_keys=True,
ensure_ascii=False)
class Freebase2DBpedia2Mongo(object):
def __init__(self, config):
self.__check_config(config)
self.__collection = config[KEY_COLLECTION]
self.__fb2dbp_file = config[KEY_MAPPING_FILE]
self.__fb2dbp_file_39 = config[
KEY_MAPPING_FILE_39] # used for removing duplicates
self.__prefix = URIPrefix()
self.__mongo_dbpedia = Mongo(MONGO_HOST, MONGO_DB,
MONGO_COLLECTION_DBPEDIA)
@staticmethod
def __check_config(config):
"""Checks params and set default values."""
try:
if KEY_COLLECTION not in config:
raise Exception(KEY_COLLECTION + " is missing")
if KEY_MAPPING_FILE not in config:
raise Exception(KEY_MAPPING_FILE + " is missing")
if KEY_MAPPING_FILE_39 not in config:
raise Exception(KEY_MAPPING_FILE_39 + " is missing")
if not (os.path.exists(config[KEY_MAPPING_FILE])) or not (
os.path.exists(config[KEY_MAPPING_FILE_39])):
raise Exception("Mapping file path does not exist.")
except Exception as e:
print("Error in config file: ", e)
sys.exit(1)
return config
def read_fb2dbp_file(self, is_39=False):
"""Reads the file and generates an initial mapping of Freebase to DBpedia IDs.
Only proper DBpedia entities are considered; i.e. redirect and disambiguation pages are ignored.
"""
fb2dbp_file = self.__fb2dbp_file_39 if is_39 else self.__fb2dbp_file
print("Processing " + fb2dbp_file + "...")
t = Triple()
p = NTriplesParser(t)
i = 0
fb2dbp_mapping = defaultdict(set)
with FileUtils.open_file_by_type(fb2dbp_file) as f:
for line in f:
try:
p.parsestring(line.decode("utf-8"))
except ParseError: # skip lines that couldn't be parsed
continue
if t.subject() is None: # only if parsed as a triple
continue
# prefixing
dbp_id = self.__prefix.get_prefixed(t.subject())
fb_id = self.__prefix.get_prefixed(t.object())
# if reading 3.9 file, converts ID to 2015-10 version
if is_39:
dbp_id = EntityUtils.convert_39_to_201510(dbp_id)
fb2dbp_mapping[fb_id].add(dbp_id)
# if reading 2015-10 file, keeps only the proper DBpedia entities
else:
entity_utils = EntityUtils(
self.__mongo_dbpedia.find_by_id(dbp_id))
if entity_utils.is_entity():
fb2dbp_mapping[fb_id].add(dbp_id)
i += 1
if i % 1000 == 0:
print(str(i // 1000) + "K lines are processed!")
return fb2dbp_mapping
def load_fb2dbp_mapping(self):
"""Checks Freebase IDs that are mapped to more than one entity and keeps only one of them."""
mappings = defaultdict(list)
fb2dbp_39 = self.read_fb2dbp_file(is_39=True)
fb2dbp = self.read_fb2dbp_file()
for fb_id, dbp_ids in fb2dbp.items():
if len(dbp_ids) > 1:
dbp_ids_39 = fb2dbp_39.get(fb_id, None)
dbp_id_39 = dbp_ids_39.pop() if dbp_ids_39 else None
if dbp_id_39 in dbp_ids:
mappings[fb_id].append(dbp_id_39)
else:
mappings[fb_id] = list(dbp_ids)
print(fb_id, "3.9", dbp_id_39, "2015", dbp_ids)
else:
mappings[fb_id] = list(dbp_ids)
print(len(mappings))
return mappings
def build_collection(self, mappings):
"""Builds Mongo collection"""
mongo = Mongo(MONGO_HOST, MONGO_DB, self.__collection)
mongo.drop()
predicate = "!<owl:sameAs>"
i = 0
for fb_id, dbp_ids in mappings.items():
for dbp_id in dbp_ids:
mongo.append_set(fb_id, predicate, [dbp_id])
i += 1
if i % 1000 == 0:
print(str(i // 1000) + "K entities are added!")
