class_docstr: Abstract base class for all activation dynamics classes to inherit from.
  
  Notes
  =====
  
  Instances of this class cannot be directly instantiated by users. However,
  it can be used to created custom activation dynamics types through
  subclassing.
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docstr: Dynamic symbol representing excitation.
  
  Explanation
  ===========
  
  The alias ``excitation`` can also be used to access the same attribute.
docstr_tok: ["Dynamic","symbol","representing","excitation",".","Explanation","===========","The","alias","``","excitation","``","can","also","be","used","to","access","the","same","attribute","."]
code: def e(self):
      """Dynamic symbol representing excitation.
  
      Explanation
      ===========
  
      The alias ``excitation`` can also be used to access the same attribute.
  
      """
      return self._e
  
imports: from abc import ABC, abstractmethod
  from functools import cached_property
  from sympy.core.symbol import Symbol
  from sympy.core.numbers import Float, Integer, Rational
  from sympy.functions.elementary.hyperbolic import tanh
  from sympy.matrices.dense import MutableDenseMatrix, zeros
  from sympy.physics.biomechanics._mixin import _NamedMixin
  from sympy.physics.mechanics import dynamicsymbols
label_desc: Use image node_id 4 for calling the ActivationBase obj's underlying member method code with example usage: obj.e() and returns: self