InternalRepresentationResearch

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Internal Representation of Perceived Sensor Data

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References

Final Design

  • spatial poolers - several, overlapping
  • temporal poolers - several

Constructing Regions

Source parameters:

  • input rectangular region of size X,Y
  • outputs is also some rectangle, where each output item is probability of corresponding sequence
  • low-probability items will not be activated if use accumulated activation
  • spacial factor defines how big are recognised spacial patterns
  • temporal factor defines how complex can be recognised sequence - temporal pattern
  • depth factor defines how complex is spacial-temporal pattern

Sequences and Columns:

  • item corresponds to cortical column
  • column stores spacial-temporal sequence
  • until allocated (filled), column is empty or half-empty
  • column defines maximum sequence size
  • half-empty sequence can be recognised, not trying to enlarge - means supporting variable-length sequences
  • so column can be: empty, partial/full unrecognized/recognised
  • column is recognised if frequence is high enough
  • sequence can be forgotten by column

Regions:

  • biologically plausible is having several regions equivalent in inputs/output sizes
  • can enlarge from bottom (intput) to top (output)
  • can have asymmetric sizes compression
  • if area overlap is zero, then input item is presented only in one output item; it means spacial inputs patterns are mapped to several outputs items, no one item represents whole picture; input pattern is represented by output pattern
  • if area overlap is not zero - then it can require too many regions to enable represent any inputs pattern by one outputs item
  • if find most active column on top level it is classical Jeff's HTM