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: Explanation
  ===========
  
  The solution to the linear system of ordinary differential equations
  governing the activation dynamics:
  
  ``M(x, r, t, p) x' = F(x, r, t, p)``.
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code: def rhs(self):
      """
  
      Explanation
      ===========
  
      The solution to the linear system of ordinary differential equations
      governing the activation dynamics:
  
      ``M(x, r, t, p) x' = F(x, r, t, p)``.
  
      """
      pass
  
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 16 for calling the ActivationBase obj's underlying member method code with example usage: obj.rhs() without return types