class_docstr: A processor for tabular dataframes.
class_docstr_tok: ["A","processor","for","tabular","dataframes","."]
docstr: Function applied to `df` if it's the train set.
docstr_tok: ["Function","applied","to","`","df","`","if","it","'s","the","train","set","."]
code: def apply_train(self, df):
      "Function applied to `df` if it's the train set."
      raise NotImplementedError
  
imports: from ..None import utils
  from ..imports import *
  from ..preprocessor import Preprocessor
  from numbers import Number
  from types import SimpleNamespace
  from typing import Any, AnyStr, Callable, Collection, Dict, Hashable, Iterator, List, Mapping, NewType, Optional, Sequence, Tuple, TypeVar, Union
  from pandas.api.types import is_categorical_dtype, is_numeric_dtype
label_desc: Use image node_id 3 for calling the TabularProc obj's underlying member method code with example usage: obj.apply_train(df) without return types