class_docstr: Base class for tuning job or training job analytics classes.
  
  Understands common functionality like persistence and caching.
docstr: Initializes ``AnalyticsMetricsBase`` instance.
docstr_tok: ["Initializes","``","AnalyticsMetricsBase","``","instance","."]
code: def __init__(self):
      """Initializes ``AnalyticsMetricsBase`` instance."""
      self._dataframe = None
  
imports: from __future__ import print_function, absolute_import
  from abc import ABCMeta, abstractmethod
  from collections import defaultdict, OrderedDict
  import datetime
  import logging
  from six import with_metaclass
  from sagemaker.session import Session
  from sagemaker.utils import DeferredError
  from sagemaker.lineage import artifact
label_desc: Use image node_id 1 to create a new AnalyticsMetricsBase object from inherited base classes:  with example: obj = AnalyticsMetricsBase()