示例#1
0
  double scaleAndRegularize(
      MultiDimensionalMap<String, String, INDArray> derivatives,
      MultiDimensionalMap<String, String, INDArray> currentMatrices,
      double scale,
      double regCost) {

    double cost = 0.0f; // the regularization cost
    for (MultiDimensionalMap.Entry<String, String, INDArray> entry : currentMatrices.entrySet()) {
      INDArray D = derivatives.get(entry.getFirstKey(), entry.getSecondKey());
      if (D.data().dataType() == DataBuffer.Type.DOUBLE)
        D =
            Nd4j.getBlasWrapper()
                .scal(scale, D)
                .addi(Nd4j.getBlasWrapper().scal(regCost, entry.getValue()));
      else
        D =
            Nd4j.getBlasWrapper()
                .scal((float) scale, D)
                .addi(Nd4j.getBlasWrapper().scal((float) regCost, entry.getValue()));

      derivatives.put(entry.getFirstKey(), entry.getSecondKey(), D);
      cost +=
          entry.getValue().mul(entry.getValue()).sum(Integer.MAX_VALUE).getDouble(0)
              * regCost
              / 2.0;
    }
    return cost;
  }
示例#2
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 public FloatMatrix getBinaryClassification(String left, String right) {
   if (combineClassification) {
     return unaryClassification.get("");
   } else {
     left = basicCategory(left);
     right = basicCategory(right);
     return binaryClassification.get(left, right);
   }
 }
示例#3
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 public FloatMatrix getWForNode(Tree node) {
   if (node.children().size() == 2) {
     String leftLabel = node.children().get(0).value();
     String leftBasic = basicCategory(leftLabel);
     String rightLabel = node.children().get(1).value();
     String rightBasic = basicCategory(rightLabel);
     return binaryTransform.get(leftBasic, rightBasic);
   } else if (node.children().size() == 1) {
     throw new AssertionError("No unary transform matrices, only unary classification");
   } else {
     throw new AssertionError("Unexpected tree children size of " + node.children().size());
   }
 }
示例#4
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 float scaleAndRegularizeFloatTensor(
     MultiDimensionalMap<String, String, FloatTensor> derivatives,
     MultiDimensionalMap<String, String, FloatTensor> currentMatrices,
     float scale,
     float regCost) {
   float cost = 0.0f; // the regularization cost
   for (MultiDimensionalMap.Entry<String, String, FloatTensor> entry :
       currentMatrices.entrySet()) {
     FloatTensor D = derivatives.get(entry.getFirstKey(), entry.getSecondKey());
     D = D.scale(scale).add(entry.getValue().scale(regCost));
     derivatives.put(entry.getFirstKey(), entry.getSecondKey(), D);
     cost += entry.getValue().mul(entry.getValue()).sum() * regCost / 2.0;
   }
   return cost;
 }
示例#5
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 public INDArray getINDArrayForNode(Tree node) {
   if (!useDoubleTensors) {
     throw new AssertionError("Not using tensors");
   }
   if (node.children().size() == 2) {
     String leftLabel = node.children().get(0).value();
     String leftBasic = basicCategory(leftLabel);
     String rightLabel = node.children().get(1).value();
     String rightBasic = basicCategory(rightLabel);
     return binaryTensors.get(leftBasic, rightBasic);
   } else if (node.children().size() == 1) {
     throw new AssertionError("No unary transform matrices, only unary classification");
   } else {
     throw new AssertionError("Unexpected tree children size of " + node.children().size());
   }
 }
示例#6
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 public FloatMatrix getClassWForNode(Tree node) {
   if (combineClassification) {
     return unaryClassification.get("");
   } else if (node.children().size() == 2) {
     String leftLabel = node.children().get(0).value();
     String leftBasic = basicCategory(leftLabel);
     String rightLabel = node.children().get(1).value();
     String rightBasic = basicCategory(rightLabel);
     return binaryClassification.get(leftBasic, rightBasic);
   } else if (node.children().size() == 1) {
     String unaryLabel = node.children().get(0).value();
     String unaryBasic = basicCategory(unaryLabel);
     return unaryClassification.get(unaryBasic);
   } else {
     throw new AssertionError("Unexpected tree children size of " + node.children().size());
   }
 }
示例#7
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 double scaleAndRegularizeINDArray(
     MultiDimensionalMap<String, String, INDArray> derivatives,
     MultiDimensionalMap<String, String, INDArray> currentMatrices,
     double scale,
     double regCost) {
   double cost = 0.0f; // the regularization cost
   for (MultiDimensionalMap.Entry<String, String, INDArray> entry : currentMatrices.entrySet()) {
     INDArray D = derivatives.get(entry.getFirstKey(), entry.getSecondKey());
     D = D.muli(scale).add(entry.getValue().muli(regCost));
     derivatives.put(entry.getFirstKey(), entry.getSecondKey(), D);
     cost +=
         entry.getValue().mul(entry.getValue()).sum(Integer.MAX_VALUE).getDouble(0)
             * regCost
             / 2.0f;
   }
   return cost;
 }
示例#8
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  private void backpropDerivativesAndError(
      Tree tree,
      MultiDimensionalMap<String, String, FloatMatrix> binaryTD,
      MultiDimensionalMap<String, String, FloatMatrix> binaryCD,
      MultiDimensionalMap<String, String, FloatTensor> binaryFloatTensorTD,
      Map<String, FloatMatrix> unaryCD,
      Map<String, FloatMatrix> wordVectorD,
      FloatMatrix deltaUp) {
    if (tree.isLeaf()) {
      return;
    }

    FloatMatrix currentVector = tree.vector();
    String category = tree.label();
    category = basicCategory(category);

    // Build a vector that looks like 0,0,1,0,0 with an indicator for the correct class
    FloatMatrix goldLabel = new FloatMatrix(numOuts, 1);
    int goldClass = tree.goldLabel();
    if (goldClass >= 0) {
      goldLabel.put(goldClass, 1.0f);
    }

    Float nodeWeight = classWeights.get(goldClass);
    if (nodeWeight == null) nodeWeight = 1.0f;
    FloatMatrix predictions = tree.prediction();

    // If this is an unlabeled class, set deltaClass to 0.  We could
    // make this more efficient by eliminating various of the below
    // calculations, but this would be the easiest way to handle the
    // unlabeled class
    FloatMatrix deltaClass =
        goldClass >= 0
            ? SimpleBlas.scal(nodeWeight, predictions.sub(goldLabel))
            : new FloatMatrix(predictions.rows, predictions.columns);
    FloatMatrix localCD = deltaClass.mmul(appendBias(currentVector).transpose());

    float error = -(MatrixFunctions.log(predictions).muli(goldLabel).sum());
    error = error * nodeWeight;
    tree.setError(error);

    if (tree.isPreTerminal()) { // below us is a word vector
      unaryCD.put(category, unaryCD.get(category).add(localCD));

      String word = tree.children().get(0).label();
      word = getVocabWord(word);

      FloatMatrix currentVectorDerivative = activationFunction.apply(currentVector);
      FloatMatrix deltaFromClass = getUnaryClassification(category).transpose().mmul(deltaClass);
      deltaFromClass =
          deltaFromClass.get(interval(0, numHidden), interval(0, 1)).mul(currentVectorDerivative);
      FloatMatrix deltaFull = deltaFromClass.add(deltaUp);
      wordVectorD.put(word, wordVectorD.get(word).add(deltaFull));

    } else {
      // Otherwise, this must be a binary node
      String leftCategory = basicCategory(tree.children().get(0).label());
      String rightCategory = basicCategory(tree.children().get(1).label());
      if (combineClassification) {
        unaryCD.put("", unaryCD.get("").add(localCD));
      } else {
        binaryCD.put(
            leftCategory, rightCategory, binaryCD.get(leftCategory, rightCategory).add(localCD));
      }

      FloatMatrix currentVectorDerivative = activationFunction.applyDerivative(currentVector);
      FloatMatrix deltaFromClass =
          getBinaryClassification(leftCategory, rightCategory).transpose().mmul(deltaClass);

      FloatMatrix mult = deltaFromClass.get(interval(0, numHidden), interval(0, 1));
      deltaFromClass = mult.muli(currentVectorDerivative);
      FloatMatrix deltaFull = deltaFromClass.add(deltaUp);

      FloatMatrix leftVector = tree.children().get(0).vector();
      FloatMatrix rightVector = tree.children().get(1).vector();

      FloatMatrix childrenVector = appendBias(leftVector, rightVector);

      // deltaFull 50 x 1, childrenVector: 50 x 2
      FloatMatrix add = binaryTD.get(leftCategory, rightCategory);

      FloatMatrix W_df = deltaFromClass.mmul(childrenVector.transpose());
      binaryTD.put(leftCategory, rightCategory, add.add(W_df));

      FloatMatrix deltaDown;
      if (useFloatTensors) {
        FloatTensor Wt_df = getFloatTensorGradient(deltaFull, leftVector, rightVector);
        binaryFloatTensorTD.put(
            leftCategory,
            rightCategory,
            binaryFloatTensorTD.get(leftCategory, rightCategory).add(Wt_df));
        deltaDown =
            computeFloatTensorDeltaDown(
                deltaFull,
                leftVector,
                rightVector,
                getBinaryTransform(leftCategory, rightCategory),
                getBinaryFloatTensor(leftCategory, rightCategory));
      } else {
        deltaDown = getBinaryTransform(leftCategory, rightCategory).transpose().mmul(deltaFull);
      }

      FloatMatrix leftDerivative = activationFunction.apply(leftVector);
      FloatMatrix rightDerivative = activationFunction.apply(rightVector);
      FloatMatrix leftDeltaDown = deltaDown.get(interval(0, deltaFull.rows), interval(0, 1));
      FloatMatrix rightDeltaDown =
          deltaDown.get(interval(deltaFull.rows, deltaFull.rows * 2), interval(0, 1));
      backpropDerivativesAndError(
          tree.children().get(0),
          binaryTD,
          binaryCD,
          binaryFloatTensorTD,
          unaryCD,
          wordVectorD,
          leftDerivative.mul(leftDeltaDown));
      backpropDerivativesAndError(
          tree.children().get(1),
          binaryTD,
          binaryCD,
          binaryFloatTensorTD,
          unaryCD,
          wordVectorD,
          rightDerivative.mul(rightDeltaDown));
    }
  }
示例#9
0
 public FloatTensor getBinaryFloatTensor(String left, String right) {
   left = basicCategory(left);
   right = basicCategory(right);
   return binaryFloatTensors.get(left, right);
 }
示例#10
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 public FloatMatrix getBinaryTransform(String left, String right) {
   left = basicCategory(left);
   right = basicCategory(right);
   return binaryTransform.get(left, right);
 }
示例#11
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  private void backpropDerivativesAndError(
      Tree tree,
      MultiDimensionalMap<String, String, INDArray> binaryTD,
      MultiDimensionalMap<String, String, INDArray> binaryCD,
      MultiDimensionalMap<String, String, INDArray> binaryINDArrayTD,
      Map<String, INDArray> unaryCD,
      Map<String, INDArray> wordVectorD,
      INDArray deltaUp) {
    if (tree.isLeaf()) {
      return;
    }

    INDArray currentVector = tree.vector();
    String category = tree.label();
    category = basicCategory(category);

    // Build a vector that looks like 0,0,1,0,0 with an indicator for the correct class
    INDArray goldLabel = Nd4j.create(numOuts, 1);
    int goldClass = tree.goldLabel();
    if (goldClass >= 0) {
      assert goldClass <= numOuts
          : "Tried adding a label that was >= to the number of configured outputs "
              + numOuts
              + " with label "
              + goldClass;
      goldLabel.putScalar(goldClass, 1.0f);
    }

    Double nodeWeight = classWeights.get(goldClass);
    if (nodeWeight == null) nodeWeight = 1.0;
    INDArray predictions = tree.prediction();

    // If this is an unlabeled class, transform deltaClass to 0.  We could
    // make this more efficient by eliminating various of the below
    // calculations, but this would be the easiest way to handle the
    // unlabeled class
    INDArray deltaClass = null;
    if (predictions.data().dataType() == DataBuffer.Type.DOUBLE) {
      deltaClass =
          goldClass >= 0
              ? Nd4j.getBlasWrapper().scal(nodeWeight, predictions.sub(goldLabel))
              : Nd4j.create(predictions.rows(), predictions.columns());

    } else {
      deltaClass =
          goldClass >= 0
              ? Nd4j.getBlasWrapper()
                  .scal((float) nodeWeight.doubleValue(), predictions.sub(goldLabel))
              : Nd4j.create(predictions.rows(), predictions.columns());
    }
    INDArray localCD = deltaClass.mmul(Nd4j.appendBias(currentVector).transpose());

    double error =
        -(Transforms.log(predictions).muli(goldLabel).sum(Integer.MAX_VALUE).getDouble(0));
    error = error * nodeWeight;
    tree.setError(error);

    if (tree.isPreTerminal()) { // below us is a word vector
      unaryCD.put(category, unaryCD.get(category).add(localCD));

      String word = tree.children().get(0).label();
      word = getVocabWord(word);

      INDArray currentVectorDerivative =
          Nd4j.getExecutioner()
              .execAndReturn(
                  Nd4j.getOpFactory().createTransform(activationFunction, currentVector));
      INDArray deltaFromClass = getUnaryClassification(category).transpose().mmul(deltaClass);
      deltaFromClass =
          deltaFromClass.get(interval(0, numHidden), interval(0, 1)).mul(currentVectorDerivative);
      INDArray deltaFull = deltaFromClass.add(deltaUp);
      INDArray wordVector = wordVectorD.get(word);
      wordVectorD.put(word, wordVector.add(deltaFull));

    } else {
      // Otherwise, this must be a binary node
      String leftCategory = basicCategory(tree.children().get(0).label());
      String rightCategory = basicCategory(tree.children().get(1).label());
      if (combineClassification) {
        unaryCD.put("", unaryCD.get("").add(localCD));
      } else {
        binaryCD.put(
            leftCategory, rightCategory, binaryCD.get(leftCategory, rightCategory).add(localCD));
      }

      INDArray currentVectorDerivative =
          Nd4j.getExecutioner()
              .execAndReturn(
                  Nd4j.getOpFactory().createTransform(activationFunction, currentVector));
      INDArray deltaFromClass =
          getBinaryClassification(leftCategory, rightCategory).transpose().mmul(deltaClass);

      INDArray mult = deltaFromClass.get(interval(0, numHidden), interval(0, 1));
      deltaFromClass = mult.muli(currentVectorDerivative);
      INDArray deltaFull = deltaFromClass.add(deltaUp);

      INDArray leftVector = tree.children().get(0).vector();
      INDArray rightVector = tree.children().get(1).vector();

      INDArray childrenVector = Nd4j.appendBias(leftVector, rightVector);

      // deltaFull 50 x 1, childrenVector: 50 x 2
      INDArray add = binaryTD.get(leftCategory, rightCategory);

      INDArray W_df = deltaFromClass.mmul(childrenVector.transpose());
      binaryTD.put(leftCategory, rightCategory, add.add(W_df));

      INDArray deltaDown;
      if (useDoubleTensors) {
        INDArray Wt_df = getINDArrayGradient(deltaFull, leftVector, rightVector);
        binaryINDArrayTD.put(
            leftCategory,
            rightCategory,
            binaryINDArrayTD.get(leftCategory, rightCategory).add(Wt_df));
        deltaDown =
            computeINDArrayDeltaDown(
                deltaFull,
                leftVector,
                rightVector,
                getBinaryTransform(leftCategory, rightCategory),
                getBinaryINDArray(leftCategory, rightCategory));
      } else {
        deltaDown = getBinaryTransform(leftCategory, rightCategory).transpose().mmul(deltaFull);
      }

      INDArray leftDerivative =
          Nd4j.getExecutioner()
              .execAndReturn(Nd4j.getOpFactory().createTransform(activationFunction, leftVector));
      INDArray rightDerivative =
          Nd4j.getExecutioner()
              .execAndReturn(Nd4j.getOpFactory().createTransform(activationFunction, rightVector));
      INDArray leftDeltaDown = deltaDown.get(interval(0, deltaFull.rows()), interval(0, 1));
      INDArray rightDeltaDown =
          deltaDown.get(interval(deltaFull.rows(), deltaFull.rows() * 2), interval(0, 1));
      backpropDerivativesAndError(
          tree.children().get(0),
          binaryTD,
          binaryCD,
          binaryINDArrayTD,
          unaryCD,
          wordVectorD,
          leftDerivative.mul(leftDeltaDown));
      backpropDerivativesAndError(
          tree.children().get(1),
          binaryTD,
          binaryCD,
          binaryINDArrayTD,
          unaryCD,
          wordVectorD,
          rightDerivative.mul(rightDeltaDown));
    }
  }
示例#12
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 public INDArray getBinaryINDArray(String left, String right) {
   left = basicCategory(left);
   right = basicCategory(right);
   return binaryTensors.get(left, right);
 }
示例#13
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 public INDArray getBinaryTransform(String left, String right) {
   left = basicCategory(left);
   right = basicCategory(right);
   return binaryTransform.get(left, right);
 }