edu.memphis.ccrg.lida.episodicmemory.sdm
Interface SparseDistributedMemory

All Known Implementing Classes:

SparseDistributedMemoryImpl

public interface SparseDistributedMemory

Implementation of Kanerva's sparse distributed memory. This implementation is based on the model described in P. Kanerva, "Sparse Distributed Memory and Related Models" in Associative Neural Memories: Theory and Implementation , pp. 50-76, Oxford University Press, 1993.

Author:

Javier Snaider

Method Summary

void	mappedStore(cern.colt.bitvector.BitVector word, cern.colt.bitvector.BitVector mapping) Stores word in this sparse distributed memory using the word as address.
cern.colt.bitvector.BitVector	retrieve(cern.colt.bitvector.BitVector addr) Retrieves the contents of this sparse distributed memory at the given address.
cern.colt.bitvector.BitVector	retrieve(cern.colt.bitvector.BitVector addr, cern.colt.bitvector.BitVector mapping) Retrieves the contents of this SDM at specified address.
cern.colt.bitvector.BitVector	retrieveIterating(cern.colt.bitvector.BitVector addr) Retrieves the contents of this sparse distributed memory at the given address iterating this process until result is equal to the address.
cern.colt.bitvector.BitVector	retrieveIterating(cern.colt.bitvector.BitVector addr, cern.colt.bitvector.BitVector mapping) Retrieves the contents of this SDM at specified address.
void	store(cern.colt.bitvector.BitVector word) Stores word in this sparse distributed memory using the word as address.
void	store(cern.colt.bitvector.BitVector word, cern.colt.bitvector.BitVector addr) Stores word in the given address in this sparse distributed memory.

Method Detail

store

void store(cern.colt.bitvector.BitVector word,
           cern.colt.bitvector.BitVector addr)

Stores word in the given address in this sparse distributed memory.

Parameters:

word - the word to be stored

addr - the address where the word is to be stored

store

void store(cern.colt.bitvector.BitVector word)

Stores word in this sparse distributed memory using the word as address.

Parameters:

word - the word to be stored

mappedStore

void mappedStore(cern.colt.bitvector.BitVector word,
                 cern.colt.bitvector.BitVector mapping)

Stores word in this sparse distributed memory using the word as address. The word is mapped (using XOR) with the mapping address.

Parameters:

word - the word to be stored.

mapping - the mapping address.

retrieve

cern.colt.bitvector.BitVector retrieve(cern.colt.bitvector.BitVector addr)

Retrieves the contents of this sparse distributed memory at the given address.

Parameters:

addr - the address of the contents to be retrieved

Returns:

the contents of this sparse distributed memory associated with the given address

retrieveIterating

cern.colt.bitvector.BitVector retrieveIterating(cern.colt.bitvector.BitVector addr)

Retrieves the contents of this sparse distributed memory at the given address iterating this process until result is equal to the address.

Parameters:

addr - the address of the contents to be retrieved

Returns:

the contents of this sparse distributed memory associated with the given address or null if the iteration did not converge

retrieveIterating

cern.colt.bitvector.BitVector retrieveIterating(cern.colt.bitvector.BitVector addr,
                                                cern.colt.bitvector.BitVector mapping)

Retrieves the contents of this SDM at specified address. The address is first mapped using specified mapping then the mapped address is used to retrieve the contents of this SDM until result of retrieval is equal to address.

Parameters:

addr - BitVector address that is being retrieved

mapping - mapping to use

Returns:

the contents of this sparse distributed memory associated with the given address or null if the iteration did not converge

retrieve

cern.colt.bitvector.BitVector retrieve(cern.colt.bitvector.BitVector addr,
                                       cern.colt.bitvector.BitVector mapping)

Retrieves the contents of this SDM at specified address. The address is first mapped using specified mapping then the mapped address is used to retrieve content from this SDM.
Note that the retrieved BitVector is mapped back before it is returned.

Parameters:

addr - the address vector

mapping - the mapping vector

Returns:

the contents of this sparse distributed memory associated with the given address or null if the iteration did not converge