code: public Factor getInsideEntries(int spanStart, int spanEnd) {
      Tensor entries = new DenseTensor(parentVar.getVariableNumsArray(),
          parentVar.getVariableSizes(), insideChart[spanStart][spanEnd]);
      return new TableFactor(parentVar, entries);
    }
docs: Get the inside unnormalized probabilities over productions at a particular
  span in the tree.