class_docstr: Ease my suffering. Map compressed group id -> key tuple
class_docstr_tok: ["Ease","my","suffering",".","Map","compressed","group","id","-",">","key","tuple"]
code: def _populate_tables(self):
      for labs, table in zip(self.labels, self.tables):
          table.map(self.comp_ids, labs.astype(np.int64))
  
imports: import warnings
  import numpy
  from pandas._libs import algos, hashtable, lib
  from pandas._libs.hashtable import unique_label_indices
  from pandas.compat import PY3, long, string_types
  from pandas.core.dtypes.cast import infer_dtype_from_array
  from pandas.core.dtypes.common import ensure_int64, ensure_platform_int, is_categorical_dtype, is_list_like
  from pandas.core.dtypes.missing import isna
  import pandas.core.algorithms
label_desc: Use image node_id 2 for calling the _KeyMapper obj's underlying member method code with example usage: obj._populate_tables() without return types