The Symbolic World Model of the Adaptive Intelligent Systems Architecture
The Symbolic World Model of the Adaptive Intelligent Systems Architecture
The symbolic world model in
AIS is encoded in a BB* conceptual
network representation.
This conceptual graph representation of the world database converts the overwhelming dataflow into a more tractable
form, using simple relationships between concepts. It also abstracts away
meta-knowledge details, to allow more
complex reasoning tasks. The
I/O subsystem also performs some abstraction,
through its use of perceptual filters,
which discard unimportant environmental details.
Also included in the database are the logical I/O
buffers.
The BB* representation's use of knowledge sources deviates
from the more STRIPS-like styles
of other operator-driven systems.
While knowledge sources do have pre-conditions, they are not restricted to
simple add/delete clauses. In fact, knowledge sources contain arbitrary
pieces of code, to be executed upon pre-condition matches. Since this code
is unbounded in the amount of time required, a knowledge source can not be
granted total control of execution. This
would violate the requirement for guaranteed latencies. However, the simple
precondition-matching required for activation of a knowledge source does
permit fast access to knowledge.
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