auryn::IafPscExpGroup Class Reference

Simple LIF neuron model with absolute refractoriness and current based synapses. More...

#include <IafPscExpGroup.h>

Inheritance diagram for auryn::IafPscExpGroup:

Collaboration diagram for auryn::IafPscExpGroup:

Public Member Functions
	IafPscExpGroup (NeuronID size)
	The default constructor of this NeuronGroup. More...
virtual	~IafPscExpGroup ()
	The default destructor. More...
void	set_refractory_period (AurynDouble t)
	Setter for refractory time [s]. More...
void	set_tau_mem (AurynFloat taum)
	Sets the membrane time constant (default 20ms) More...
void	set_r_mem (AurynFloat rm)
	Sets the membrane resistance (default 100 M-ohm) More...
void	set_c_mem (AurynFloat cm)
	Sets the membrane capacitance (default 200pF) More...
void	set_tau_syn (AurynFloat tau)
	Sets the exponential time constant for current based synapses. More...
void	clear ()
	Resets all neurons to defined and identical initial state. More...
void	evolve ()
	Integrates the NeuronGroup state. More...
Public Member Functions inherited from auryn::NeuronGroup
	NeuronGroup (NeuronID n, NodeDistributionMode mode=AUTO)
	Default constructor. More...
	NeuronGroup (NeuronID n, double loadmultiplier, NeuronID total)
	Old default constructor. More...
virtual	~NeuronGroup ()
void	set_state (std::string name, AurynState val)
	Conveniently sets all values in a state vector identified by name in this group. More...
void	set_state (std::string name, NeuronID i, AurynState val)
	Conveniently sets a single value of element i in a state vector identified by name in this group. More...
virtual AurynStateVector *	get_default_exc_target ()
	Returns default exc target input. More...
virtual AurynStateVector *	get_default_inh_target ()
	Returns default inh target input. More...
void	random_mem (AurynState mean=-60e-3, AurynState sigma=5e-3)
virtual void	init_state ()
void	safe_tadd (NeuronID id, AurynWeight amount, TransmitterType t=GLUT)
void	tadd (NeuronID id, AurynWeight amount, TransmitterType t=GLUT)
void	tadd (AurynStateVector *state, NeuronID id, AurynWeight amount)
Public Member Functions inherited from auryn::SpikingGroup
void	add_state_vector (std::string key, AurynStateVector *state_vector)
	Adds a state vector passed as an argument to the dictinary. More...
void	remove_state_vector (std::string key)
	Removes a state vector passed as an argument to the dictinary. More...
AurynStateVector *	find_state_vector (std::string key)
	Returns existing state vector by name or NULL if it does not exist. More...
AurynStateVector *	get_state_vector (std::string key)
	Creates a new or returns an existing state vector by name. More...
AurynStateVector *	get_existing_state_vector (std::string key)
	Returns an existing state with the supplied name. More...
AurynStateVector *	create_state_vector (std::string key)
	Creates a new state vector and throws an exception if a vector with the same name exists. More...
AurynState *	get_state_variable (std::string key)
	Creates a new group-wide state variable or returns an existing group-wide variable by name then returns a pointer to it. More...
void	randomize_state_vector_gauss (std::string state_vector_name, AurynState mean, AurynState sigma, int seed=12239)
	Randomizes the content of a state vector with Gaussian random numbers. Seeding is MPI save. More...
	SpikingGroup (NeuronID size, NodeDistributionMode mode=AUTO)
	Default constructor. More...
virtual	~SpikingGroup ()
	Default destructor. More...
virtual void	evolve_traces ()
	Evolves traces. More...
void	set_name (std::string s)
	Set connection name. More...
std::string	get_name ()
	Retrieves the groups name. More...
std::string	get_file_name ()
	Extracts the class name of the connection from the file name. More...
std::string	get_log_name ()
	Returns a string which is the combination of file and connection name for logging. More...
void	inc_num_spike_attributes (int x)
	Instructs SpikingGroup to increase the number of spike attributes by x. More...
int	get_num_spike_attributes ()
void	conditional_evolve ()
	Conditional evolve functino which is called by System. More...
unsigned int	get_locked_rank ()
	Returns locked rank for SpikingGroups which are not distributed across all ranks. More...
unsigned int	get_locked_range ()
	Returns locked range of ranks for SpikingGroups which are not distributed across all ranks. More...
SpikeContainer *	get_spikes ()
	Returns pointer to a spike container that contains spikes which arrive in this timestep from all neurons in this group. More...
SpikeContainer *	get_spikes_immediate ()
	Returns pointer to SpikeContainer of spikes generated during the last evolve() step. More...
AttributeContainer *	get_attributes ()
	Returns pointer to Attributecontainer for usage in propagating Connection objects. Same as get_spikes_immediate(), however might be overwritten to contain Spikes that have been delayed. More...
AttributeContainer *	get_attributes_immediate ()
	Returns pointer to Attributecontainer of spikes generated during the last evolve() step. More...
NeuronID	get_size ()
	Returns the size of the group. More...
NeuronID	get_pre_size ()
	Returns the size of the group. More...
NeuronID	calculate_rank_size (int rank=-1)
	Determines rank size and stores it in local variable. More...
NeuronID	get_rank_size ()
	Returns the size on this rank. More...
NeuronID	get_post_size ()
	Returns the size on this rank. More...
void	set_clock_ptr (AurynTime *clock)
bool	evolve_locally ()
	Returns true if the calling instance has units which are integrated on the current rank. More...
NeuronID	get_uid ()
	Get the unique ID of the class. More...
Trace *	get_pre_trace (AurynFloat x)
	Returns a pre trace with time constant x. More...
void	add_pre_trace (Trace *tr)
	Adds trace to pretrace stack of a connection. More...
Trace *	get_post_trace (AurynFloat x)
	Returns a post trace with time constant x. More...
void	add_post_trace (Trace *tr)
	Adds trace to posttrace stack of a connection. More...
void	push_spike (NeuronID spike)
	Pushes a local NeuronID as spike into the axonal SpikeDelay buffer. More...
void	push_attribute (AurynFloat attrib)
	Pushes a spike attribute into the axonal SpikeDelay buffer. More...
void	clear_spikes ()
	Clears all spikes stored in the delays which is useful to reset a network during runtime. More...
Trace *	get_post_state_trace (std::string state_name="mem", AurynFloat tau=10e-3, AurynFloat b=0.0)
	Returns a post trace of a neuronal state variable e.g. the membrane potential with time constant tau. More...
Trace *	get_post_state_trace (AurynStateVector *state, AurynFloat tau=10e-3, AurynFloat b=0.0)
	Returns a post trace of a neuronal state variable specified by pointer. More...
void	set_delay (int d)
	Sets axonal delay for this SpikingGroup. More...
virtual bool	write_to_file (const char *filename)
	Writes current states of SpikingGroup to human-readible textfile if implemented in derived class. More...
virtual bool	load_from_file (const char *filename)
	Reads current states of SpikingGroup to human-readible textfile if implemented in derived class. More...
NeuronID	ranksize ()
	Returns size (num of neurons) on the current rank. More...
NeuronID	global2rank (NeuronID i)
	Converts global NeuronID within the SpikingGroup to the local NeuronID on this rank. More...
NeuronID	rank2global (NeuronID i)
	Converts local NeuronID from the local rank to a global NeuronID. More...
bool	localrank (NeuronID i)
	Checks if the global NeuronID i is integrated on this MPI rank. More...
NeuronID	get_vector_size ()
	Rank size but rounded up to multiples of 4 (or potentially some other and larger number in future versions) for SSE compatibility. More...

Public Attributes
AurynFloat	e_rest
AurynFloat	thr
AurynStateVector *	bg_current
	Vector holding neuronspecific background currents. More...
AurynStateVector *	syn_current
	Vector holding neuronspecific synaptic currents. More...
ExpCubaSynapse *	synapse_model
AurynStateVector *	temp
	Temp vector. More...
AurynVector< unsigned short > *	ref
	Vector holding neuronspecific state of refractory period. More...
Public Attributes inherited from auryn::NeuronGroup
AurynStateVector *	mem
AurynStateVector *	g_ampa
AurynStateVector *	g_gaba
AurynStateVector *	g_nmda
AurynStateVector *	thr
Public Attributes inherited from auryn::SpikingGroup
SpikeDelay *	delay
bool	active
	Toggles group active. More...
std::map< std::string, AurynStateVector * >	state_vectors
std::map< std::string, AurynState >	state_variables

Additional Inherited Members
Protected Member Functions inherited from auryn::NeuronGroup
void	init ()
void	free ()
Protected Member Functions inherited from auryn::SpikingGroup
void	free ()
	Frees potentially allocated memory. More...
Protected Attributes inherited from auryn::NeuronGroup
AurynStateVector *	default_exc_target_state
AurynStateVector *	default_inh_target_state
Protected Attributes inherited from auryn::SpikingGroup
std::vector< Trace * >	pretraces
	Pretraces. More...
std::vector< Trace * >	posttraces
	Posttraces. More...
std::vector< Trace * >	post_state_traces
	Post state traces. More...
std::vector< AurynFloat >	post_state_traces_spike_biases
std::vector< AurynStateVector * >	post_state_traces_states
std::string	group_name
	Identifying name for object. More...
NeuronID	size
	Stores the size of the group. More...
NeuronID	rank_size
	Stores the size of the group on this rank. More...
SpikeContainer *	spikes
	SpikeContainers to store spikes produced during one step of evolve. More...
AttributeContainer *	attribs
Static Protected Attributes inherited from auryn::SpikingGroup
static AurynTime *	clock_ptr = NULL

Detailed Description

Simple LIF neuron model with absolute refractoriness and current based synapses.

This model is simular to the one used in Vogels and Abbott 2005, with exponential currents and does not make a distinction between the timecourse of exc and inh synases.

To give input to these neurons use set_transmitter("syn_current") as a transmitter target.

Constructor & Destructor Documentation

IafPscExpGroup()

IafPscExpGroup::IafPscExpGroup

(

NeuronID

size

)

The default constructor of this NeuronGroup.

                                            : NeuronGroup(size)
{
        auryn::sys->register_spiking_group(this);
        if ( evolve_locally() ) init();
}

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~IafPscExpGroup()

IafPscExpGroup::~IafPscExpGroup ( )

virtual

The default destructor.

{
        if ( !evolve_locally() ) return;

        delete synapse_model;
        delete ref;
}

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Member Function Documentation

clear()

void IafPscExpGroup::clear ( )

virtual

Resets all neurons to defined and identical initial state.

Implements auryn::NeuronGroup.

{
        clear_spikes();
        for (NeuronID i = 0; i < get_rank_size(); i++) {
           mem->set( i, e_rest);
           ref->set( i, 0);
           g_ampa->set( i, 0.);
           g_gaba->set( i, 0.);
           bg_current->set( i, 0.);
        }
}

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evolve()

void IafPscExpGroup::evolve ( )

virtual

Integrates the NeuronGroup state.

The evolve method internally used by System.

Implements auryn::SpikingGroup.

{

        // integrate membrane

    // compute current
    temp->diff(e_rest, mem); // leak current
        temp->add(bg_current); // bg current
        temp->add(syn_current); // syn_current

    // membrane dynamics
    mem->saxpy(scale_mem,temp);

        // hard refractory time (clamped to zero)
        for (NeuronID i = 0 ; i < get_rank_size() ; ++i ) {
        if (t_ref[i]==0) {
                        if (t_mem[i]>thr) {
                                push_spike(i);
                                t_mem[i] = e_rest ;
                                t_ref[i] += refractory_time ;
                        } 
                } else {
                        t_ref[i]-- ;
                        t_mem[i] = e_rest ;
                }

        }

        synapse_model->evolve();
}

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set_c_mem()

void IafPscExpGroup::set_c_mem

(

AurynFloat

cm

)

Sets the membrane capacitance (default 200pF)

{
        c_mem = cm;
        tau_mem = r_mem*c_mem;
        calculate_scale_constants();
}

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set_r_mem()

void IafPscExpGroup::set_r_mem

(

AurynFloat

rm

)

Sets the membrane resistance (default 100 M-ohm)

{
        r_mem = rm;
        tau_mem = r_mem*c_mem;
        calculate_scale_constants();
}

set_refractory_period()

void IafPscExpGroup::set_refractory_period

(

AurynDouble

t

)

Setter for refractory time [s].

{
        refractory_time = (unsigned short) (t/auryn_timestep);
}

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set_tau_mem()

void IafPscExpGroup::set_tau_mem

(

AurynFloat

taum

)

Sets the membrane time constant (default 20ms)

{
        tau_mem = taum;
        calculate_scale_constants();
}

set_tau_syn()

void IafPscExpGroup::set_tau_syn

(

AurynFloat

tau

)

Sets the exponential time constant for current based synapses.

{
        tau_syn = tau;
        calculate_scale_constants();
}

Member Data Documentation

bg_current

AurynStateVector* auryn::IafPscExpGroup::bg_current

Vector holding neuronspecific background currents.

e_rest

AurynFloat auryn::IafPscExpGroup::e_rest

ref

AurynVector<unsigned short>* auryn::IafPscExpGroup::ref

Vector holding neuronspecific state of refractory period.

syn_current

AurynStateVector* auryn::IafPscExpGroup::syn_current

Vector holding neuronspecific synaptic currents.

synapse_model

ExpCubaSynapse* auryn::IafPscExpGroup::synapse_model

temp

AurynStateVector* auryn::IafPscExpGroup::temp

Temp vector.

thr

AurynFloat auryn::IafPscExpGroup::thr

---

The documentation for this class was generated from the following files:

• /home/zenke/auryn/src/auryn/IafPscExpGroup.h
• /home/zenke/auryn/src/auryn/IafPscExpGroup.cpp