PoissonRate Class Reference

Class for generating Poisson spike trains. More...

#include <poisson_rate.h>

Classes
class	Impl

Public Member Functions
	PoissonRate (int nNeur, bool onGPU=false)
	PoissonRate constructor. More...
	~PoissonRate ()
	PoissonRate destructor. More...
int	getNumNeurons ()
	Returns the number of neurons for which to generate Poisson spike trains. More...
float	getRate (int neurId)
	Returns the mean firing rate of a specific neuron ID. More...
float *	getRatePtrCPU ()
	Returns pointer to CPU-allocated firing rate array (deprecated) More...
float *	getRatePtrGPU ()
	Returns pointer to GPU-allocated firing rate array (deprecated) More...
std::vector< float >	getRates ()
	Returns a vector of firing rates, one element per neuron. More...
bool	isOnGPU ()
	Checks whether the firing rates are allocated on CPU or GPU. More...
void	setRate (int neurId, float rate)
	Sets the mean firing rate of a particular neuron ID. More...
void	setRates (const std::vector< float > &rates)
	Sets the mean firing rate of each neuron from a vector. More...
void	setRates (float rate)
	Assigns the same mean firing rate to all neurons. More...

Detailed Description

The PoissonRate class allows a user create spike trains whose inter-spike interval follows a Poisson process. The object can then be linked to a spike generator group (created via CARLsim::createSpikeGeneratorGroup) by calling CARLsim::setSpikeRate.

All firing rates will be initialized to zero. The user then has a number of options to manipulate the mean firing rate of each neuron. The same rate can be applied to all neurons by calling PoissonRate::setRates(float rate). Individual rates can be applied from a vector by calling PoissonRate::setRates(const std::vector<float>& rates). The rate of a single neuron can be manipulated by calling PoissonRate::setRate(int neurId, float rate).

Example usage:

// create a PoissonRate object on GPU for a group of 50 neurons
PoissonRate myRate(50, true);
 
// let all rates be zero except the one for neurId=42, set that to 20 Hz
myRate.setRate(42, 20.0f);
 
// apply to spike generator group (say, g0) of CARLsim object in SETUP or EXECUTION state
// and run the network for a second
sim.setSpikeRate(g0, &myRate);
sim.runNetwork(1,0);
 
// now change the rates of all neurons to 12 Hz
myRate.setRates(12.0f);
sim.setSpikeRate(g0, &myRate);
sim.runNetwork(1,0);

Attention

The mean firing rate will keep getting applied to any instances of CARLsim::runNetwork until the user changes the values and calls CARLsim::setSpikeRate again.

Note

A PoissonRate object can be allocated either on the CPU or the GPU. However, GPU allocation is only supported if the CARLsim simulation is run in GPU_MODE.

Since

v3.0

Definition at line 84 of file poisson_rate.h.

Constructor & Destructor Documentation

PoissonRate()

PoissonRate	(	int	nNeur,
		bool	onGPU = false
	)

Creates a new instance of class PoissonRate.

Parameters

[in]	nNeur	the number of neurons for which to generate Poisson spike trains
[in]	onGPU	whether to allocate the rate vector on GPU (true) or CPU (false)

Since

v2.0

Definition at line 219 of file poisson_rate.cpp.

~PoissonRate()

~PoissonRate

(

)

Cleans up all the memory upon object deletion.

Since

v2.0

Definition at line 220 of file poisson_rate.cpp.

Member Function Documentation

getNumNeurons()

int getNumNeurons

(

)

This function returns the number of neurons for which to generate Poisson spike trains. This number is defined at initialization and cannot be changed during the object lifetime.

Returns

number of neurons

Since

v3.0

Definition at line 222 of file poisson_rate.cpp.

getRate()

float getRate

(

int

neurId

)

This function returns the mean firing rate assigned to a specific neuron ID. The neuron ID is 0-indexed and should thus be in the range [ 0 , getNumNeurons() ). It is completely independent from CARLsim neuron IDs.

Parameters

[in]

neurId

the neuron ID (0-indexed)

Returns

mean firing rate

Since

v3.0

Definition at line 223 of file poisson_rate.cpp.

getRatePtrCPU()

float * getRatePtrCPU

(

)

This function returns a pointer to the underlying firing rate array if allocated on the CPU. This pointer does not exist when the PoissonRate object is allocated on GPU.

Deprecated:

This function is deprecated, as it should not be exposed to the high-level UI API. Use PoissonRate::getRates instead.

Definition at line 225 of file poisson_rate.cpp.

getRatePtrGPU()

float * getRatePtrGPU

(

)

This function returns a pointer to the underlying firing rate array if allocated on the GPU. This pointer does not exist when the PoissonRate object is allocated on CPU.

Deprecated:

This function is deprecated, as it should not be exposed to the high-level UI API. Use PoissonRate::getRates instead.

Definition at line 226 of file poisson_rate.cpp.

getRates()

std::vector< float > getRates

(

)

This function returns all the mean firing rates in a vector, one vector element per neuron.

Returns

vector of firing rates

Since

v3.0

Definition at line 224 of file poisson_rate.cpp.

isOnGPU()

bool isOnGPU

(

)

This function checks whether the firing rates are allocated either on CPU or GPU.

Returns

a flag whether allocated on GPU (true) or CPU (false)

Since

v3.0

Definition at line 227 of file poisson_rate.cpp.

setRate()

void setRate	(	int	neurId,
		float	rate
	)

This function sets the firing rate of a particular neuron ID. The neuron ID is 0-indexed and should thus be in the range [ 0 , getNumNeurons() ). It is completely independent from CARLsim neuron IDs.

Parameters

[in]	neurId	the neuron ID (0-indexed)
[in]	rate	the firing rate to set

Since

v3.0

Definition at line 228 of file poisson_rate.cpp.

setRates() [1/2]

void setRates

(

const std::vector< float > &

rates

)

This function sets the firing rate of each neuron from a vector of firing rates, one rate per neuron.

Parameters

[in]

rates

vector of firing rates (size should be equivalent to PoissonRate::getNumNeurons())

Since

v3.0

Definition at line 230 of file poisson_rate.cpp.

setRates() [2/2]

void setRates

(

float

rate

)

This function assigns the same firing rate to all the neurons.

Parameters

[in]

rate

the firing rate to set

Since

v3.0

Definition at line 229 of file poisson_rate.cpp.

---

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

• poisson_rate.h
• poisson_rate.cpp