brainpy.dyn.base.ConNeuGroup
brainpy.dyn.base.ConNeuGroup#
- class brainpy.dyn.base.ConNeuGroup(size, C=1.0, A=0.001, V_th=0.0, V_initializer=Uniform(min_val=- 70, max_val=- 60.0, seed=None), method='exp_auto', name=None, **channels)[source]#
Base class to model conductance-based neuron group.
The standard formulation for a conductance-based model is given as
\[C_m {dV \over dt} = \sum_jg_j(E - V) + I_{ext}\]where \(g_j=ar{g}_{j} M^x N^y\) is the channel conductance, \(E\) is the reversal potential, \(M\) is the activation variable, and \(N\) is the inactivation variable.
\(M\) and \(N\) have the dynamics of
\[{dx \over dt} = \phi_x {x_\infty (V) - x \over au_x(V)}\]where \(x \in [M, N]\), \(\phi_x\) is a temperature-dependent factor, \(x_\infty\) is the steady state, and :math:` au_x` is the time constant. Equivalently, the above equation can be written as:
\[\]rac{d x}{d t}=phi_{x}left(lpha_{x}(1-x)-eta_{x} x ight)
where \(lpha_{x}\) and \(eta_{x}\) are rate constants.
New in version 2.1.9.
- sizeint, sequence of int
The network size of this neuron group.
- method: str
The numerical integration method.
- nameoptional, str
The neuron group name.
- __init__(size, C=1.0, A=0.001, V_th=0.0, V_initializer=Uniform(min_val=- 70, max_val=- 60.0, seed=None), method='exp_auto', name=None, **channels)[source]#
Methods
__init__
(size[, C, A, V_th, V_initializer, ...])derivative
(V, t)get_delay_data
(name, delay_step, *indices)Get delay data according to the provided delay steps.
has
(**children_cls)The aggressive operation to gather master and children classes.
ints
([method])Collect all integrators in this node and the children nodes.
load_states
(filename[, verbose])Load the model states.
nodes
([method, level, include_self])Collect all children nodes.
register_delay
(name, delay_step, delay_target)Register delay variable.
register_implicit_nodes
(nodes)register_implicit_vars
(variables)reset
()Reset function which reset the whole variables in the model.
reset_delay
(name, delay_target)Reset the delay variable.
save_states
(filename[, variables])Save the model states.
train_vars
([method, level, include_self])The shortcut for retrieving all trainable variables.
unique_name
([name, type_])Get the unique name for this object.
update
(t, dt)The function to specify the updating rule.
update_delay
(name, delay_data)Update the delay according to the delay data.
vars
([method, level, include_self])Collect all variables in this node and the children nodes.
Attributes
global_delay_vars
name
steps