diff --git a/notebook/research/acl2021.ipynb b/notebook/research/acl2021.ipynb
index e5f53c556..18aef2b99 100644
--- a/notebook/research/acl2021.ipynb
+++ b/notebook/research/acl2021.ipynb
@@ -774,7 +774,7 @@
     "                   \"learning_rate\": {\"l\": 3e-5, \"u\": 1.5e-4, \"space\": \"log\"},\n",
     "                   \"warmup_ratio\": [0.1],\n",
     "                   \"num_train_epochs\": [3],\n",
-    "                   \"per_device_train_batch_size\": [16, 32, 64],\n",
+    "                   \"per_device_train_batch_size\": [32],\n",
     "                   \"weight_decay\": [0.0],\n",
     "                   \"attention_probs_dropout_prob\": [0.1],\n",
     "                   \"hidden_dropout_prob\": [0.1],\n",
@@ -786,7 +786,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The validation F1/accuracy we got was 93.2/90.4, where the accuracy outperforms grid search. The test F1/accuracy was 90.9/87.4. As a result, random search with 4*GST and the minimal search space `hpo_space_min` has outperformed grid search. We stop the troubleshooting process."
+    "The validation F1/accuracy we got was 93.5/91.1, where the accuracy outperforms grid search. The test F1/accuracy was 90.1/86.1. As a result, random search with 4*GST and the minimum space overfits. We stop the troubleshooting process because the search space cannot be further reduced."
    ]
   }
  ],