projection namespace

The projection namespace contains the creators, synapse_generators, and parameters_generators namespaces.

The namespace also implements the connect_populations function to link two projections. As a result, the function creates a projection connecting these two populations and adds it to the neural network object. Use this function to link two populations with one of the following images:

• The resulting projection has arbitrary connections between population neurons.
• In the resulting projection, each neuron in the presynaptic population is connected to each neuron in the postsynaptic population.

creators namespace

The creators namespace implements functions for generating synapse projections. The namespace provides the following functions:

• all_to_all—generates a projection of synapses connecting each neuron in the presynaptic population to each neuron in the postsynaptic population.
• one_to_one—generates a projection of synapses connecting neurons of the presynaptic and postsynaptic populations in a one-to-one relationship.
• from_container—generates a projection of synapses from a container containing synapse attributes and presynaptic and postsynaptic neuron indices.
• from_map—generates a projection of synapses from a std::map object containing synapse attributes as value and presynaptic and postsynaptic neuron indices as key.
• fixed_probability—generates a projection of the synapses connecting each neuron in the presynaptic population to each neuron in the postsynaptic population. Synapses are generated with a given probability.
• index_based—generates a projection of synapses connecting neurons in the population if the synapse generation function returns a non-zero std::optional value. The indices of the presynaptic and postsynaptic neurons are passed to the synapse generation function.
• fixed_number_post—generates a projection of synapses connecting each neuron in the presynaptic population to a given number of random neurons in the postsynaptic population.
• fixed_number_pre—generates a projection of synapses connecting each neuron in the postsynaptic population to a given number of random neurons in the presynaptic population.
• clone_projection—generates a projection whose synapses are copied from another projection. The original and created projections can be of different types.

synapse_generators namespace

The synapse_generators namespace implements functions and interfaces for generating synapses. The namespace provides the following functions and interfaces:

• The all_to_all function, which generates synapses between each neuron in the presynaptic population and each neuron in the postsynaptic population.
• The one_to_one function, which generates one-to-one synapses between neurons in the presynaptic and postsynaptic populations.
• The from_container function, which generates synapses from a container containing synapse attributes and presynaptic and postsynaptic neuron indices.
• The FromMap class, which generates synapses from an std::map or std::unordered_map object containing synapse attributes as the value and presynaptic and postsynaptic neuron indices as the key.
• The FixedProbability class, which generates synapses between each neuron in the presynaptic population and each neuron in the postsynaptic population. Synapses are generated with a given probability.
• The index_based function, which generates synapses connecting neurons in the populations if the synapse generation function returns a non-zero std::optional value. The indices of the presynaptic and postsynaptic neurons are passed to the synapse generation function.
• The FixedNumberPost class, which generates synapses between each neuron in the presynaptic population and a specified number of random neurons in the postsynaptic population.
• The FixedNumberPre class, which generates synapses between each neuron in the postsynaptic population and a specified number of random neurons in the presynaptic population.
• The Clone_projection function, which generates synapses whose attributes are copied from another synapse. The original and newly created synapses can have different types.

parameters_generators namespaces

The namespace implements the default_synapse_gen function and the CopySynapseGen class. The default_synapse_gen function generates a synapse with the default attribute values. The CopySynapseGen class implements a synapse generator that copies attributes from a given synapse.

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