class_docstr: Base class for a backend manager class 
class_docstr_tok: ["Base","class","for","a","backend","manager","class"]
code: def _get_default_session(cls):
      if not InterfaceBase._default_session:
          InterfaceBase._default_session = Session(
              initialize_logging=False,
              config=config_obj,
              api_key=ENV_ACCESS_KEY.get(),
              secret_key=ENV_SECRET_KEY.get(),
          )
      return InterfaceBase._default_session
  
imports: import abc
  import requests.exceptions
  import six
  import jsonschema
  from ..backend_api import Session, CallResult
  from ..backend_api.session.session import MaxRequestSizeError
  from ..backend_api.session.response import ResponseMeta
  from ..backend_api.session import BatchRequest
  from ..backend_api.session.defs import ENV_ACCESS_KEY, ENV_SECRET_KEY, ENV_OFFLINE_MODE
  from ..config import config_obj
  from ..config.defs import LOG_LEVEL_ENV_VAR
  from ..debugging import get_logger
  from .session import SendError, SessionInterface
label_desc: Use image node_id 7 for calling the InterfaceBase obj's underlying member method code with example usage: obj._get_default_session(cls) and returns: InterfaceBase