Examples of org.encog.ml.prg.EncogProgram

org.encog.ml.prg.EncogProgram
Holds an Encog Programming Language (EPL) program. A Encog program is internally represented as a tree structure. It can be rendered to a variety of forms, such as RPN, common infix expressions, or Latex. The Encog Workbench also allows display as a graphical tree. An Encog Program is both a genome and phenome. No decoding is necessary. Every Encog Program has a context. The context is the same for every Encog Program in a population. The context defines which opcodes should be used, as well as the defined variables. The actual values for the variables are not stored in the context. Rather they are stored in a variable holder. Each program usually has its own variable holder, though it is possible to share.

   * {@inheritDoc}
   */
  @Override
  public boolean rewrite(final Genome g) {
    this.rewritten = false;
    final EncogProgram program = (EncogProgram) g;
    final ProgramNode node = program.getRootNode();
    final ProgramNode rewrittenRoot = internalRewrite(node);
    if (rewrittenRoot != null) {
      program.setRootNode(rewrittenRoot);
    }
    return this.rewritten;
  }

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   * {@inheritDoc}
   */
  @Override
  public boolean rewrite(final Genome g) {
    this.rewritten = false;
    final EncogProgram program = (EncogProgram) g;
    final ProgramNode node = program.getRootNode();
    final ProgramNode rewrittenRoot = internalRewrite(node);
    if (rewrittenRoot != null) {
      program.setRootNode(rewrittenRoot);
    }
    return this.rewritten;
  }

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  /**
   * {@inheritDoc}
   */
  @Override
  public void run() {
    final EncogProgram prg = this.owner.attemptCreateGenome(this.rnd,
        this.population);
    this.owner.addPopulationMember(this.population, prg);
  }

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   * @return The generated genome.
   */
  public EncogProgram attemptCreateGenome(final Random rnd,
      final Population pop) {
    boolean done = false;
    EncogProgram result = null;
    int tries = this.maxGenerationErrors;


    while (!done) {
      result = generate(rnd);
      result.setPopulation(pop);


      double s;
      try {
        tries--;
        s = this.score.calculateScore(result);
      } catch (final EARuntimeError e) {
        s = Double.NaN;
      }


      if (tries < 0) {
        throw new EncogError("Could not generate a valid genome after "
            + this.maxGenerationErrors + " tries.");
      } else if (!Double.isNaN(s) && !Double.isInfinite(s)
          && !this.contents.contains(result.dumpAsCommonExpression())) {
        done = true;
      }
    }


    return result;

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  /**
   * {@inheritDoc}
   */
  @Override
  public EncogProgram generate(final Random rnd) {
    final EncogProgram program = new EncogProgram(this.context);
    final List<ValueType> types = new ArrayList<ValueType>();
    types.add(this.context.getResult().getVariableType());
    program.setRootNode(createNode(rnd, program, determineMaxDepth(rnd),
        types));
    return program;
  }

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  /**
   * {@inheritDoc}
   */
  @Override
  public double calculateScore(final MLMethod genome) {
    final EncogProgram prg = (EncogProgram) genome;
    final PrgPopulation pop = (PrgPopulation) prg.getPopulation();
    final MLData inputData = new BasicMLData(pop.getContext()
        .getDefinedVariables().size());
    prg.compute(inputData);
    return 0;
  }

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  /**
   * {@inheritDoc}
   */
  @Override
  public boolean rewrite(Genome g) {
    EncogProgram program = ((EncogProgram)g);
    this.rewritten = false;
    ProgramNode rootNode = program.getRootNode();
    ProgramNode rewrite = rewriteNode(rootNode);
    if (rewrite != null) {
      program.setRootNode(rewrite);
    }
    return this.rewritten;
  }

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    this.expressionFields.clear();
    this.extension = new ProcessExtension(this.getFormat());
    this.extension.register(this.programContext.getFunctions());
    
    for(ProcessField field : this.analyst.getScript().getProcess().getFields() ) {
      EncogProgram prg = new EncogProgram(this.programContext,this.programVariables);
      prg.setExtraData(ProcessExtension.EXTENSION_DATA_NAME, this.extension);
      prg.compileExpression(field.getCommand());
      this.expressionFields.add(prg);
    }
  }

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   */
  @Override
  public void performOperation(final Random rnd, final Genome[] parents,
      final int parentIndex, final Genome[] offspring,
      final int offspringIndex) {
    final EncogProgram parent1 = (EncogProgram) parents[0];
    final EncogProgram parent2 = (EncogProgram) parents[1];
    offspring[0] = null;


    final EncogProgramContext context = parent1.getContext();
    final int size1 = parent1.getRootNode().size();
    final int size2 = parent2.getRootNode().size();


    boolean done = false;
    int tries = 100;


    while (!done) {
      final int p1Index = rnd.nextInt(size1);
      final int p2Index = rnd.nextInt(size2);


      final LevelHolder holder1 = new LevelHolder(p1Index);
      final LevelHolder holder2 = new LevelHolder(p2Index);


      final List<ValueType> types = new ArrayList<ValueType>();
      types.add(context.getResult().getVariableType());


      findNode(rnd, parent1.getRootNode(), types, holder1);
      findNode(rnd, parent2.getRootNode(), types, holder2);


      if (LevelHolder.compatibleTypes(holder1.getTypes(),
          holder2.getTypes())) {
        final EncogProgram result = context.cloneProgram(parent1);
        final ProgramNode resultNode = parent1.findNode(p1Index);
        final ProgramNode p2Node = parent2.findNode(p2Index);
        final ProgramNode newInsert = context.cloneBranch(result,
            p2Node);
        result.replaceNode(resultNode, newInsert);
        offspring[0] = result;
        done = true;
      } else {
        tries--;
        if (tries < 0) {

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   * @param input
   *            The input to the
   */
  @Override
  public MLData compute(final MLData input) {
    final EncogProgram best = (EncogProgram) getBestGenome();
    return best.compute(input);
  }

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org.encog.app.analyst.csv.process.AnalystProcess

org.encog.ml.data.basic.BasicMLData

org.encog.ml.data.MLData

org.encog.ml.ea.exception.EACompileError

org.encog.ml.ea.exception.EARuntimeError

org.encog.ml.prg.expvalue.ExpressionValue

org.encog.ml.prg.generator.AbstractPrgGenerator

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org.encog.ml.prg.opp.ConstMutation

org.encog.ml.prg.opp.SubtreeCrossover

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