Example #1
0
  /**
   * The primary method in charge of learning. Adapts the permanence values of the synapses based on
   * the input vector, and the chosen columns after inhibition round. Permanence values are
   * increased for synapses connected to input bits that are turned on, and decreased for synapses
   * connected to inputs bits that are turned off.
   *
   * @param c the {@link Connections} (spatial pooler memory)
   * @param inputVector a integer array that comprises the input to the spatial pooler. There exists
   *     an entry in the array for every input bit.
   * @param activeColumns an array containing the indices of the columns that survived inhibition.
   */
  public void adaptSynapses(Connections c, int[] inputVector, int[] activeColumns) {
    int[] inputIndices = ArrayUtils.where(inputVector, ArrayUtils.INT_GREATER_THAN_0);

    double[] permChanges = new double[c.getNumInputs()];
    Arrays.fill(permChanges, -1 * c.getSynPermInactiveDec());
    ArrayUtils.setIndexesTo(permChanges, inputIndices, c.getSynPermActiveInc());
    for (int i = 0; i < activeColumns.length; i++) {
      Pool pool = c.getPotentialPools().get(activeColumns[i]);
      double[] perm = pool.getDensePermanences(c);
      int[] indexes = pool.getSparsePotential();
      ArrayUtils.raiseValuesBy(permChanges, perm);
      Column col = c.getColumn(activeColumns[i]);
      updatePermanencesForColumn(c, perm, col, indexes, true);
    }
  }
Example #2
0
  @Test
  public void testGetDensePotential() {
    Connections connections = new Connections();
    connections.setNumInputs(10);

    Pool pool = new Pool(3);
    Synapse[] synapses = new Synapse[3];
    int[] connecteds = new int[] {0, 1, 0, 0, 1, 1, 0, 1, 0, 1};
    for (int i = 0, j = 0; i < connecteds.length; i++) {
      if (connecteds[i] == 0) continue;
      synapses[j] = new Synapse(connections, null, null, pool, i, i);
      synapses[j].setPermanence(
          connections, 0.0); // 0.0 -> These aren't set as connected but simply members.
    }

    int[] expected = {0, 1, 0, 0, 1, 1, 0, 1, 0, 1};
    int[] dense = pool.getDensePotential(connections);
    assertTrue(Arrays.equals(expected, dense));
  }
Example #3
0
  /**
   * This method increases the permanence values of synapses of columns whose activity level has
   * been too low. Such columns are identified by having an overlap duty cycle that drops too much
   * below those of their peers. The permanence values for such columns are increased.
   *
   * @param c
   */
  public void bumpUpWeakColumns(final Connections c) {
    int[] weakColumns =
        ArrayUtils.where(
            c.getMemory().get1DIndexes(),
            new Condition.Adapter<Integer>() {
              @Override
              public boolean eval(int i) {
                return c.getOverlapDutyCycles()[i] < c.getMinOverlapDutyCycles()[i];
              }
            });

    for (int i = 0; i < weakColumns.length; i++) {
      Pool pool = c.getPotentialPools().get(weakColumns[i]);
      double[] perm = pool.getSparsePermanences();
      ArrayUtils.raiseValuesBy(c.getSynPermBelowStimulusInc(), perm);
      int[] indexes = pool.getSparsePotential();
      Column col = c.getColumn(weakColumns[i]);
      updatePermanencesForColumnSparse(c, perm, col, indexes, true);
    }
  }
Example #4
0
  @Test
  public void testGetDenseConnected() {
    Connections connections = new Connections();
    connections.setSynPermConnected(0.2d);
    connections.setNumInputs(5);

    Pool pool = new Pool(3);
    Synapse[] synapses = new Synapse[3];
    double[] perms = new double[] {0.0, 0.2, 0.0, 0.2, 0.2};
    for (int i = 0, j = 0; i < perms.length; i++) {
      if (perms[i] == 0) continue;
      synapses[j] = new Synapse(connections, null, null, pool, i, i);
      synapses[j++].setPermanence(connections, perms[i]);
    }

    int[] expected = {0, 1, 0, 1, 1};
    int[] dense = pool.getDenseConnected(connections);
    assertTrue(Arrays.equals(expected, dense));

    int[] expected2 = {0, 1, 0, 1, 0}; // expect last bit below synPermConnected
    synapses[2].setPermanence(connections, 0.19d); // set last bit below synPermConnected
    dense = pool.getDenseConnected(connections);
    assertTrue(Arrays.equals(expected2, dense));
  }