Jlmlab Lens Extensions

• Added functions for creating, connecting and lesioning groups based on topographic bias

  • addCircularGroup command adds a spatially organised group to the active network.Its usage is

     addCircularGroup <group> <num-units> <radius> <center-x> <center-y> [[+|]<group-type>]* 

    This creates a group positioned at the given center with the specified name, number of units and radius and places it at the end of the network's group array.Each unit will be given a topographical representation based on a uniform grid like distribution of all units within the circular layout formed by the group.Unless a radius of zero is specified for the group, each unit will have a unique co-ordinate position.A group with zero radius will be considered as having all units with the same spatial orientation as the center.The <group-type> parameter can be specified just like in the standard addGroup command.
  • connectBiasedGroups command creates links from one group to another based on a specified degree of topographic bias and a pattern of connection.Usage for this is

     connectBiasedGroups <group1> <group2> [-strength <strength> | -p <proj-type> | -d <standard deviation> | -mean <mean> | -range <range> | -type <link-type> 

    The first group sends the projections and the second group receives them. Possible projection types (or connectivity patterns) are BIASED_IN and BIASED_OUT. Strength is a floating point number in the range (0,1] specifying the density of the connectivity, as described below. Standard deviation is typically a positive floating point number that determines the topographic bias for establishing connections between spatially oriented units of the two groups.Standard deviation of -1 holds a special meaning. It is used to indicate uniform connectivity.By default, the projection type used is BIASED_OUT,strength is 1.0 and standard deviation is -1.0 .
    In describing the projection types, S is the specified connectivity strength, I is the number of units in the sending group, O is the number of units in the receiving group and f() is the floor function.
    BIASED_OUT causes each sending unit to project to exactly f(S*O) receiving units.
    BIASED_IN ensures that each receiving unit has exactly f(S*I) inputs.
    <range> , <mean> and <link-type> paramaters have the same meaning as in standard connectGroups command.

Source directory/files:

• On master.cnbc.cmu.edu : ~sjohn/Lens/Src
• On swan64.cnbc.cmu.edu : ~sjohn/Lens/Src

Executable

• ~sjohn/Lens/Bin/llens
• ~sjohn/Lens/Bin/lalens
• ~sjohn/Lens/Bin/lslens