docstr: Create an Experiment and track it
  
  :param username: username
  :type username: str
  :param name: experiment name
  :type name: str
  :param exp_config_blob: configuration of experiment
  :type exp_config_blob: str
  :return: experiment ID
  :rtype: int
docstr_tok: ["Create","an","Experiment","and","track","it",":","param","username",":","username",":","type","username",":","str",":","param","name",":","experiment","name",":","type","name",":","str",":","param","exp_config_blob",":","configuration","of","experiment",":","type","exp_config_blob",":","str",":","return",":","experiment","ID",":","rtype",":","int"]
code: def start_experiment(self, username, name, exp_config_blob):
      """
      Create an Experiment and track it
  
      :param username: username
      :type username: str
      :param name: experiment name
      :type name: str
      :param exp_config_blob: configuration of experiment
      :type exp_config_blob: str
      :return: experiment ID
      :rtype: int
      """
      raise NotImplementedError
  
imports: import abc
  import logging
label_desc: Use image node_id 9 for calling the AbstractConnector obj's underlying member method code with example usage: obj.start_experiment(username, name, exp_config_blob) without return types