docs: private void simpleIncrement(TensorBase other, double multiplier) {
      Preconditions.checkArgument(Arrays.equals(other.getDimensionNumbers(), getDimensionNumbers()));
      if (other instanceof DenseTensorBase) {
        double[] otherTensorValues = ((DenseTensorBase) other).values;
        Preconditions.checkArgument(otherTensorValues.length == values.length);
        int length = values.length;
        for (int i = 0; i < length; i++) {
          values[i] += otherTensorValues[i] * multiplier;
        }
      } else {
        int otherSize = other.size();
        for (int i = 0; i < otherSize; i++) {
          long keyNum = other.indexToKeyNum(i);
          double value = other.getByIndex(i);
          values[keyNumToIndex(keyNum)] += value * multiplier;
        }
      }
    }