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you can use opencv's FileStorage to inspect the saved xml file.

i don't have a serialized RF xml file at hand, but for an SVM it is:

<?xml version="1.0"?>
<opencv_storage>
<opencv_ml_svm> // 1st level
  ...
  <class_labels type_id="opencv-matrix"> // 2nd level
    <rows>5</rows>
    <cols>1</cols>
    <dt>i</dt>
    <data>
      1 2 3 4 5</data></class_labels>
 ...

FileStorage fs("my.xml", FileStorage::READ);
Mat labels;
fs["opencv_ml_svm"]["class_labels"] >> labels;  // change tag names to your need !

cerr << labels.t() << endl;
//[1,2,3,4,5]

you can use opencv's FileStorage to inspect the saved xml file.

i don't have a serialized RF xml file at hand, but for an SVM it is:

<?xml version="1.0"?>
<opencv_storage>
<opencv_ml_svm> // 1st level
  ...
  <class_labels type_id="opencv-matrix"> // 2nd level
    <rows>5</rows>
    <cols>1</cols>
    <dt>i</dt>
    <data>
      1 2 3 4 5</data></class_labels>
  ...

FileStorage fs("my.xml", FileStorage::READ);
Mat labels;
fs["opencv_ml_svm"]["class_labels"] >> labels;  // change tag names to your need !

cerr << labels.t() << endl;
//[1,2,3,4,5]