InitSparseConnectivitySnippet::FixedNumberPostWithReplacement Class Reference

Initialises connectivity with a fixed number of random synapses per row. More...

#include <initSparseConnectivitySnippet.h>

Inheritance diagram for InitSparseConnectivitySnippet::FixedNumberPostWithReplacement:

Public Member Functions
	DECLARE_SNIPPET (InitSparseConnectivitySnippet::FixedNumberPostWithReplacement, 1)
	SET_ROW_BUILD_CODE ("if(c == 0) {\ " $(endRow);\" "}\" "const scalar u=$(gennrand_uniform);\" "x+=(1.0 - x) *(1.0 - pow(u, 1.0/(scalar) c));\" "unsigned int postIdx=(unsigned int)(x *$(num_post));\" "postIdx=(postIdx< $(num_post)) ? postIdx :($(num_post) - 1);\" "$(addSynapse, postIdx+$(id_post_begin));\" "c--;\")
	SET_ROW_BUILD_STATE_VARS ({{"x", "scalar", 0.0},{"c", "unsigned int", "$(rowLength)"}})
virtual StringVec	getParamNames () const override
	Gets names of of (independent) model parameters. More...
	SET_CALC_MAX_ROW_LENGTH_FUNC ([](unsigned int, unsigned int, const std::vector< double > &pars) { return(unsigned int) pars[0];})
	SET_CALC_MAX_COL_LENGTH_FUNC ([](unsigned int numPre, unsigned int numPost, const std::vector< double > &pars) { const double quantile=pow(0.9999, 1.0/(double) numPost);return binomialInverseCDF(quantile,(unsigned int) pars[0] *numPre, 1.0/(double) numPost);})
Public Member Functions inherited from InitSparseConnectivitySnippet::Base
virtual std::string	getRowBuildCode () const
virtual ParamValVec	getRowBuildStateVars () const
virtual std::string	getColBuildCode () const
virtual ParamValVec	getColBuildStateVars () const
virtual std::string	getHostInitCode () const
virtual CalcMaxLengthFunc	getCalcMaxRowLengthFunc () const
	Get function to calculate the maximum row length of this connector based on the parameters and the size of the pre and postsynaptic population. More...
virtual CalcMaxLengthFunc	getCalcMaxColLengthFunc () const
	Get function to calculate the maximum column length of this connector based on the parameters and the size of the pre and postsynaptic population. More...
virtual CalcKernelSizeFunc	getCalcKernelSizeFunc () const
	Get function to calculate kernel size required for this conenctor based on its parameters. More...
boost::uuids::detail::sha1::digest_type	getHashDigest () const
	Update hash from snippet. More...
void	validate () const
	Validate names of parameters etc. More...
Public Member Functions inherited from Snippet::Base
virtual	~Base ()
virtual DerivedParamVec	getDerivedParams () const
virtual EGPVec	getExtraGlobalParams () const
size_t	getExtraGlobalParamIndex (const std::string &paramName) const
	Find the index of a named extra global parameter. More...

Additional Inherited Members
Public Types inherited from InitSparseConnectivitySnippet::Base
typedef std::function< unsigned int(unsigned int, unsigned int, const std::vector< double > &)>	CalcMaxLengthFunc
typedef std::function< std::vector< unsigned int >const std::vector< double > &)>	CalcKernelSizeFunc
Public Types inherited from Snippet::Base
typedef std::vector< std::string >	StringVec
typedef std::vector< EGP >	EGPVec
typedef std::vector< ParamVal >	ParamValVec
typedef std::vector< DerivedParam >	DerivedParamVec
Protected Member Functions inherited from Snippet::Base
void	updateHash (boost::uuids::detail::sha1 &hash) const
void	validate () const
	Validate names of parameters etc. More...
Static Protected Member Functions inherited from Snippet::Base
template<typename T >
static size_t	getNamedVecIndex (const std::string &name, const std::vector< T > &vec)

Detailed Description

Initialises connectivity with a fixed number of random synapses per row.

The postsynaptic targets of the synapses can be initialised in parallel by sampling from the discrete uniform distribution. However, to sample connections in ascending order, we sample from the 1st order statistic of the uniform distribution – Beta[1, Npost] – essentially the next smallest value. In this special case this is equivalent to the exponential distribution which can be sampled in constant time using the inversion method.

Member Function Documentation

DECLARE_SNIPPET()

InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::DECLARE_SNIPPET	(	InitSparseConnectivitySnippet::FixedNumberPostWithReplacement	,
		1
	)

getParamNames()

virtual StringVec InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::getParamNames ( ) const

inlineoverridevirtual

Gets names of of (independent) model parameters.

Reimplemented from Snippet::Base.

SET_CALC_MAX_COL_LENGTH_FUNC()

InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::SET_CALC_MAX_COL_LENGTH_FUNC

(

[] (unsigned int numPre, unsigned int numPost, const std::vector< double > &pars) { const double quantile=pow(0.9999, 1.0/(double) numPost);return binomialInverseCDF(quantile,(unsigned int) pars[0] *numPre, 1.0/(double) numPost);}

)

SET_CALC_MAX_ROW_LENGTH_FUNC()

InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::SET_CALC_MAX_ROW_LENGTH_FUNC

(

[] (unsigned int, unsigned int, const std::vector< double > &pars) { return(unsigned int) pars[0];}

)

SET_ROW_BUILD_CODE()

InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::SET_ROW_BUILD_CODE

(

)

SET_ROW_BUILD_STATE_VARS()

InitSparseConnectivitySnippet::FixedNumberPostWithReplacement::SET_ROW_BUILD_STATE_VARS

(

{{"x", "scalar", 0.0},{"c", "unsigned int", "$(rowLength)"}}

)

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

• initSparseConnectivitySnippet.h