code: def get_inner_replacement_value(val):
      return (
          np.nan
          if isinstance(val, string_types) and val.lower() == "nan"
          else val
      )
  
imports: import re
  import numpy
  import pandas
  from six import string_types
  import dtale.global_state
  from dtale.column_builders import ReplaceColumnBuilder
  from dtale.utils import classify_type, find_dtype, dict_merge
label_desc: Use image node_id 1 for calling a global function with example usage: get_inner_replacement_value(val) and returns: unknown