class_docstr: Utility transformer: Passes all specified columns through a given function.
class_docstr_tok: ["Utility","transformer",":","Passes","all","specified","columns","through","a","given","function","."]
code: def __init__(
      self,
      features=None,
      excluded_features=None,
      output_column_prefix=None,
      transform_function=lambda x: x,
      transform_function_name="none",
  ):
      self._setup()
  
      # Process and make a copy of the features, exclude.
      _features, _exclude = _internal_utils.process_features(
          features, excluded_features
      )
  
      # Type check
      _raise_error_if_not_of_type(
          output_column_prefix, [str, type(None)]
      )
  
      state = {}
      state["output_column_prefix"] = output_column_prefix
      state["features"] = _features
      state["excluded_features"] = _exclude
      state["fitted"] = False
      state["transform_function"] = transform_function
      state["transform_function_name"] = transform_function_name
  
      if _exclude:
          self._exclude = True
          self._features = _exclude
      else:
          self._exclude = False
          self._features = _features
  
      self.__proxy__.update(state)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from .None import TransformerBase
  from .None import TransformerChain
  from .None import TransformToFlatDictionary
  from turicreate.toolkits._model import PythonProxy
  from turicreate.toolkits._model import ExposeAttributesFromProxy
  from turicreate.toolkits._internal_utils import _toolkit_repr_print
  from turicreate.toolkits._internal_utils import _precomputed_field
  from turicreate.toolkits._internal_utils import _raise_error_if_not_sframe
  from turicreate.util import _raise_error_if_not_of_type
  from turicreate.toolkits._internal_utils import _check_categorical_option_type
  from .None import _internal_utils
  from array import array
  import textwrap
  from turicreate import SFrame
  import turicreate
label_desc: Use image node_id 3 to create a new _ColumnFunctionTransformation object from inherited base classes: _TransformerBase, ExposeAttributesFromProxy with example: obj = _ColumnFunctionTransformation(features, excluded_features, output_column_prefix, transform_function, transform_function_name)