Machine Learning Paradigms by Dionisios N. Sotiropoulos & George A. Tsihrintzis

Author:Dionisios N. Sotiropoulos & George A. Tsihrintzis
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

6.5.5 Immunological Memory as a Sparse Distributed Memory

Sparse Distributed Memories (SDMs) resemble the random access memory in a computer since they share the same reading and writing functionalities. SDMs in particular are written to by providing an address and data and read from by providing an address and getting an output. Unlike random access memory, however, the address space of SDM is enormous, sometimes 1000 bits, yielding possible addresses. SDMs cannot instantiate such a large number of address-data locations. These instantiated address-data locations are called hard locations and are said to sparsely cover the input space [16]. When an address is presented to the memory, hard locations within some threshold Hamming distance of the address are activated. This subset of activated hard locations is called the access circle of the address, as illustrated in Fig. 6.10a.

Fig. 6.10Sparse distributed memories

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