docstr: Setting collection name 
docstr_tok: ["Setting","collection","name"]
code: def set_collection(self, collection_name):
      """Setting collection name"""
      self._collection_name = collection_name
  
imports: import random
  import logging
  import time
  from multiprocessing import Process
  from pymilvus import Milvus, DataType
  import utils
  import config
  from milvus_benchmark.runners import utils
label_desc: Use image node_id 3 for calling the MilvusClient obj's underlying member method code with example usage: obj.set_collection(collection_name) without return types