code: def __init__(self, obj):
      self._obj = obj
  
file_path: mars/mars/dataframe/plotting/core.py
imports: from collections import OrderedDict
  import pandas
  from ...core import ENTITY_TYPE, ExecutableTuple
  from ...utils import adapt_mars_docstring
label_desc: Use image node_id 1 to create a new PlotAccessor object  with example: obj = PlotAccessor(obj)