diff --git a/utils/viewer.ipynb b/utils/viewer.ipynb
index b0e6f9c..2bd044a 100644
--- a/utils/viewer.ipynb
+++ b/utils/viewer.ipynb
@@ -614,6 +614,66 @@
     }
    ],
    "metadata": {}
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "source": [
+    "def query_viz(query, n_rows, n_cols, image_mode = False):\n",
+    "    items = [set() for _ in range(n_cols)]\n",
+    "    if image_mode:\n",
+    "        # image mode\n",
+    "    else:\n",
+    "        pick = query.groupby('category_id').sample(n_rows*2, replace=True)[['id', 'image_id', 'category_id', 'category_name', 'X', 'Y', 'W', 'H']].values.tolist()\n",
+    "\n",
+    "        for obj in pick:\n",
+    "            if len(items[obj[2]]) >= n_rows: continue\n",
+    "            items[obj[2]].add(tuple(obj))\n",
+    "    max_len = 0\n",
+    "    for item in items:\n",
+    "        max_len = max(max_len,len(item))\n",
+    "\n",
+    "    fig, axes = plt.subplots(max_len, n_cols, sharex=False, sharey=False, figsize=(30, 32))\n",
+    "    fig.suptitle(f\"{label_name}\", fontsize=28)\n",
+    "\n",
+    "    for col in range(n_cols):\n",
+    "        for row, (obj_id, img_id, label, name, x, y, w, h) in enumerate(items[col]):\n",
+    "            y, x, h, w = int(x), int(y), int(w), int(h)\n",
+    "            image, target, image_id = single_view_dataset[img_id]\n",
+    "            if w > 1 and h > 1:\n",
+    "                axes[row, col].imshow(image[x:x+w+1,y:y+h+1,:])\n",
+    "                axes[row, col].set_title(f\"[{img_id:0>4d}.jpg/{obj_id}], [{h},{w}]\", fontsize=10)\n",
+    "                # axes[row, col].set_title(f\"[{pick:0>4d}.jpg/{object_pick}] [{label}]{name} ({w},{h})\", fontsize=24)\n",
+    "                axes[row, col].axis('off')\n",
+    "\n",
+    "    plt.tight_layout(rect=[0, 0, 1, 0.97])\n",
+    "    plt.show()"
+   ],
+   "outputs": [],
+   "metadata": {}
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "source": [
+    "n_rows = 10\n",
+    "query =  df[df['X'] < 5] \n",
+    "num_class = 10\n",
+    "query_viz(query, n_rows, num_class)"
+   ],
+   "outputs": [],
+   "metadata": {}
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "source": [
+    "n_rows, num_class = 10, 10\n",
+    "query = df[(df['W'] < 10) & (df['W'] > 0)] \n",
+    "query_viz(query, n_rows, num_class)"
+   ],
+   "outputs": [],
+   "metadata": {}
   }
  ],
  "metadata": {