brainpy.neurons.ALIFBellec2020#
- class brainpy.neurons.ALIFBellec2020(size, keep_size=False, V_rest=-70.0, V_th=-60.0, R=1.0, beta=1.6, tau=20.0, tau_a=2000.0, tau_ref=None, noise=None, V_initializer=OneInit(value=-70.0), a_initializer=OneInit(value=-50.0), spike_fun=<function relu_grad>, input_var=True, method='exp_auto', name=None, mode=None, eprop=False)[source]#
Leaky Integrate-and-Fire model with SFA [1].
This model is similar to the GLIF2 model in the Technical White Paper on generalized LIF (GLIF) models from AllenInstitute [2].
Formally, this model is given by:
\[\begin{split}\tau \dot{V} = -(V - V_{\mathrm{rest}}) + R*I \\ \tau_a \dot{a} = -a\end{split}\]Once a spike is induced by \(V(t) > V_{\mathrm{th}} + \beta a\), then
\[\begin{split}V \gets V - V_{\mathrm{th}} \\ a \gets a + 1\end{split}\]References
- __init__(size, keep_size=False, V_rest=-70.0, V_th=-60.0, R=1.0, beta=1.6, tau=20.0, tau_a=2000.0, tau_ref=None, noise=None, V_initializer=OneInit(value=-70.0), a_initializer=OneInit(value=-50.0), spike_fun=<function relu_grad>, input_var=True, method='exp_auto', name=None, mode=None, eprop=False)[source]#
Methods
__init__
(size[, keep_size, V_rest, V_th, R, ...])add_aft_update
(key, fun)Add the after update into this node
add_bef_update
(key, fun)Add the before update into this node
add_inp_fun
(key, fun[, label, category])Add an input function.
clear_input
()Empty function of clearing inputs.
cpu
()Move all variable into the CPU device.
cuda
()Move all variables into the GPU device.
dV
(V, t, I_ext)da
(a, t)get_aft_update
(key)Get the after update of this node by the given
key
.get_batch_shape
([batch_size])get_bef_update
(key)Get the before update of this node by the given
key
.get_delay_data
(identifier, delay_pos, *indices)Get delay data according to the provided delay steps.
get_delay_var
(name)get_inp_fun
(key)Get the input function.
get_local_delay
(var_name, delay_name)Get the delay at the given identifier (name).
has_aft_update
(key)Whether this node has the after update of the given
key
.has_bef_update
(key)Whether this node has the before update of the given
key
.init_param
(param[, shape, sharding])Initialize parameters.
init_variable
(var_data, batch_or_mode[, ...])Initialize variables.
jit_step_run
(i, *args, **kwargs)The jitted step function for running.
load_state
(state_dict, **kwargs)Load states from a dictionary.
load_state_dict
(state_dict[, warn, compatible])Copy parameters and buffers from
state_dict
into this module and its descendants.nodes
([method, level, include_self])Collect all children nodes.
register_delay
(identifier, delay_step, ...)Register delay variable.
register_implicit_nodes
(*nodes[, node_cls])register_implicit_vars
(*variables[, var_cls])register_local_delay
(var_name, delay_name[, ...])Register local relay at the given delay time.
reset
(*args, **kwargs)Reset function which reset the whole variables in the model (including its children models).
reset_local_delays
([nodes])Reset local delay variables.
reset_state
([batch_size])return_info
()save_state
(**kwargs)Save states as a dictionary.
setattr
(key, value)- rtype:
state_dict
(**kwargs)Returns a dictionary containing a whole state of the module.
step_run
(i, *args, **kwargs)The step run function.
sum_current_inputs
(*args[, init, label])Summarize all current inputs by the defined input functions
.current_inputs
.sum_delta_inputs
(*args[, init, label])Summarize all delta inputs by the defined input functions
.delta_inputs
.sum_inputs
(*args, **kwargs)to
(device)Moves all variables into the given device.
tpu
()Move all variables into the TPU device.
tracing_variable
(name, init, shape[, ...])Initialize the variable which can be traced during computations and transformations.
train_vars
([method, level, include_self])The shortcut for retrieving all trainable variables.
tree_flatten
()Flattens the object as a PyTree.
tree_unflatten
(aux, dynamic_values)Unflatten the data to construct an object of this class.
unique_name
([name, type_])Get the unique name for this object.
update
([x])The function to specify the updating rule.
update_local_delays
([nodes])Update local delay variables.
vars
([method, level, include_self, ...])Collect all variables in this node and the children nodes.
Attributes
after_updates
before_updates
cur_inputs
current_inputs
delta_inputs
derivative
implicit_nodes
implicit_vars
mode
Mode of the model, which is useful to control the multiple behaviors of the model.
name
Name of the model.
supported_modes
Supported computing modes.
varshape
The shape of variables in the neuron group.