Leabra Implementation Reference - Computational Explorations in Cognitive Neuroscience - page 451

C.5 Layer-Level Variables

LeabraLayer layer object:

Variable Description
n units Number of units to create with Build command (0=use geometry).
geom Geometry (size) of units in layer (or of each subgroup if geom.z > 1).
pos Position of layer within network.
gp geom Geometry of subgroups (if geom.z > 1).
projections Group of receiving projections for this layer.
units Units or groups of units in the layer.
unit spec Default unit specification for units in this layer: only applied during Build or
explicit SetUnitSpec command.
lesion Inactivate this layer from processing (reversible).
ext flag Indicates which kind of external input layer received.
netin Average and maximum net input ( net ) values for layer ( avg , max ). These values
kept for information purposes only.
acts Avg and max activation values for the layer — avg is used for sending average
activation computation in savg cor in the ConSpec.
acts p Plus-phase activation stats for the layer.
acts m Minus-phase activation stats for the layer.
acts dif Difference between plus and minus phase vals above.
phase dif ratio Phase-difference ratio ( acts p.avg / acts m.avg ) that can be used with
phase dif in UnitSpec to prevent learning when network is inactive in minus
phase but active in plus phase.

values for kwta - activity levels, etc:

kwta

Actual target number of active units for layer.

.k

Actual target percent activity in layer.

.pct

Inhib threshold for kth most active unit (top k for avg-based).

.k ithr

Inhib threshold for k+1th unit (other units for avg-based).

.k1 ithr

Log of ratio of ithr values, indicates sharpness of differentiation between active
and inactive units.

.ithr r

Computed inhibition values: kwta = kWTA inhibition, g i = overall inhibition
(usually same as kwta, but not for UNIT INHIB).

i val

Average and stdev (not max) values for unit inhib.

un g i

Adapting kwta point values (if adapting, not by default).

adapt pt

Determines the spec that controls this layer.

spec

List of layers to link inhibition with (not commonly used).

layer links

Actual stim gain for soft clamping, can be incremented to ensure clamped units
active.

stm gain

hard clamped If true, this layer is actually hard clamped.