fix: Set correct parser for validation dataset

Author: pierluigiferrari

ssd7_0.h5

@@ -203,7 +203,7 @@
     "                             include_classes='all',\n",
     "                             box_output_format=['class_id', 'xmin', 'xmax', 'ymin', 'ymax'])\n",
     "\n",
-    "val_dataset.parse_xml(labels_path='./data/val_labels.csv',\n",
+    "val_dataset.parse_csv(labels_path='./data/val_labels.csv',\n",
     "                      input_format=['image_name', 'xmin', 'xmax', 'ymin', 'ymax', 'class_id'])\n",
     "\n",
     "val_generator = val_dataset.generate(batch_size=batch_size,\n",