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By edited by G.E. Hinton.

Preface to the particular factor on connectionist image processing / G.E. Hinton --
BoltzCONS : dynamic image constructions in a connectionist community / D.S. Touretzky --
Mapping part-whole hierarchies into connectionist networks / G.E. Hinton --
Recursive allotted representations / J.B. Pollack --
Mundane reasoning by way of choosing a believable version / M. Derthick --
Tensor product variable binding and the illustration of symbolic buildings in connectionist platforms / P. Smolensky --
Learning and using contextual constraints in sentence comprehension / M.F. St. John and J.L. McCelland .

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If not, it can begin following a reclamation path, starting with the subtree beginning with the now orphaned tag, as in case (2). If both the car and cdr point to now-orphaned subtrees, the storage recovery mechanism need only pursue one of them. The other will be picked up later by random search. , tuples not pointed to by any other tuple. This would be yet another variant on the familiar winner-take-all network. A unit that votes for, say, the tag J, would have excitatory connections from Tuple Memory units with J in their tag fields, and also inhibitory connections from Tuple Memory units with J in either their car or cdr fields.

They serve merely as latches to hold an activity pattern and apply it as input to the Tuple Buffer. ' Storing a pattern would be achieved by lowering the thresholds of selected Tuple Buffer units, making them more likely to come on. On the other hand, storing tuples as activity patterns rather than as modified thresholds allows multiple paraIlel access to Tuple Memory, as shown in Fig. 19. Some BoltzeONS algorithms, such as those for permuting nodes in a tree, have faster and more straightforward implementations in a multiple-buffer architecture.

When we get to the end of a chain of reclaimed tuples we go back to random search again . If we use a dedicated Tuple Buffer for this purpose, reclamation can occur in parallel with, and completely independent of, the creation and manipulation of non-garbage structures. (3) Monitor deletions If the storage recovery mechanism is in random search mode when BoltzCONS deletes a tuple, it should immediately check the car and cdr of the deleted tuple to see if they are tags (rather than atoms), and if any tuples other than the one just deleted contain those tags.

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