code: def _compute_shape(self, input_shape):
      return input_shape
  
imports: from __future__ import division
  from __future__ import print_function
  from __future__ import absolute_import
  from .core import SingleInputMixin, OneDimOutputMixin, Node, ScoringMode, NonlinearMxtsMode
  import tensorflow
  from deeplift.util import NEAR_ZERO_THRESHOLD
  from deeplift.layers import helper_functions
label_desc: Use image node_id 3 for calling the Activation obj's underlying member method code with example usage: obj._compute_shape(input_shape) and returns: input_shape