code: def skip(self, col):
      return (col not in self._nan_cnt) or (
          self._nan_cnt[col].sum() == 0
      )
  
imports: import pandas
  import numpy
  from qlib.contrib.report.data.base import FeaAnalyser
  from qlib.contrib.report.utils import sub_fig_generator
  from qlib.utils.paral import datetime_groupby_apply
  from qlib.contrib.eva.alpha import pred_autocorr_all
  from loguru import logger
  import seaborn
label_desc: Use image node_id 2 for calling the FeaNanAnaRatio obj's underlying member method code with example usage: obj.skip(col) and returns: unknown