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: Ordered column matrix of non-time varying symbols present in ``M``
  and ``F``.
  
  Only symbolic constants are returned. If a numeric type (e.g. ``Float``)
  has been used instead of ``Symbol`` for a constant then that attribute
  will not be included in the matrix returned by this property. This is
  because the primary use of this property attribute is to provide an
  ordered sequence of the still-free symbols that require numeric values
  during code generation.
  
  Explanation
  ===========
  
  The alias ``constants`` can also be used to access the same attribute.
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code: def p(self):
      """Ordered column matrix of non-time varying symbols present in ``M``
      and ``F``.
  
      Only symbolic constants are returned. If a numeric type (e.g. ``Float``)
      has been used instead of ``Symbol`` for a constant then that attribute
      will not be included in the matrix returned by this property. This is
      because the primary use of this property attribute is to provide an
      ordered sequence of the still-free symbols that require numeric values
      during code generation.
  
      Explanation
      ===========
  
      The alias ``constants`` can also be used to access the same attribute.
  
      """
      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 13 for calling the ActivationBase obj's underlying member method code with example usage: obj.p() without return types