Fix get_label_pairs import as per PR review

Author: Val Brodsky

examples/integrations/detectron2/coco_object.ipynb

@@ -116,6 +116,7 @@
         "    feature_miou_metric, \n",
         "    feature_confusion_matrix_metric\n",
         ")\n",
+        "from labelbox.data.metrics.group import get_label_pairs\n",
         "\n",
         "with open('./coco_utils.py', 'w' ) as file:\n",
         "    helper = requests.get(\"https://raw.githubusercontent.com/Labelbox/labelbox-python/master/examples/integrations/detectron2/coco_utils.py\").text\n",
@@ -460,7 +461,7 @@
     {
       "metadata": {},
       "source": [
-        "pairs = lb.get_label_pairs(val_labels, labels_mea, filter_mismatch = True)\n",
+        "pairs = get_label_pairs(val_labels, labels_mea, filter_mismatch = True)\n",
         "for (ground_truth, prediction) in pairs.values():\n",
         "    metrics = []\n",
         "    metrics.extend(feature_miou_metric(ground_truth.annotations, prediction.annotations))\n",