class_docstr: Transforms the input sentence by adding a subordinate clause from WikiData.
  
  Example::
      original: "And it left mixed signals for London."
      transformed: "And it left mixed signals for London, which is a capital
          and largest city of the United Kingdom."
class_docstr_tok: ["Transforms","the","input","sentence","by","adding","a","subordinate","clause","from","WikiData",".","Example",":",":","original",":","``","And","it","left","mixed","signals","for","London",".","''","transformed",":","``","And","it","left","mixed","signals","for","London",",","which","is","a","capital","and","largest","city","of","the","United","Kingdom",".","''"]
docstr: Generate a subordinate clause for the given Wikidata entry.
  
  :param str entity_id: The ID of the given Wikidata entry.
  :return: The subordinate clause generated.
docstr_tok: ["Generate","a","subordinate","clause","for","the","given","Wikidata","entry",".",":","param","str","entity_id",":","The","ID","of","the","given","Wikidata","entry",".",":","return",":","The","subordinate","clause","generated","."]
code: def clause_generate(self, entity_id):
      r"""
      Generate a subordinate clause for the given Wikidata entry.
  
      :param str entity_id: The ID of the given Wikidata entry.
      :return: The subordinate clause generated.
  
      """
      client = Client()
      entity = client.get(EntityId(entity_id))
      instance = client.get(EntityId(WIKIDATA_INSTANCE["instance"]))
      instances = entity.getlist(instance)
      disamb = client.get(EntityId(WIKIDATA_INSTANCE["disambiguation"]))
      if disamb in instances:
          return ""
      statements = WIKIDATA_STATEMENTS
      random.shuffle(statements)
  
      for sta in statements:
          if not sta:
              instances = entity.getlist(instance)
              human = client.get(EntityId(WIKIDATA_INSTANCE["human"]))
              if human in instances:
                  head_phrase = CLAUSE_HEAD[0].replace("which", "who")
                  return head_phrase + str(entity.description)
              else:
                  return CLAUSE_HEAD[0] + str(entity.description)
          else:
              statement_entity = client.get(sta)
              statement = entity.getlist(statement_entity)
              if statement:
                  for state in statement:
                      if isinstance(state, Entity):
                          return CLAUSE_HEAD[sta] + str(state.label)
  
file_path: textflint/textflint/generation/transformation/DP/add_sub_tree.py
imports: import json
  import random
  import urllib.request
  from wikidata.client import Client
  from wikidata.entity import Entity, EntityId
  from ..transformation import Transformation
  from ....common.utils.error import FlintError
  from ....common.settings import WIKIDATA_STATEMENTS, CLAUSE_HEAD, WIKIDATA_INSTANCE
label_desc: Use image node_id 4 for calling the AddSubTree obj's underlying member method code with example usage: obj.clause_generate(entity_id) and returns: str, unknown, unknown, unknown