Minor fixes to xgboost example (#2832)

Co-authored-by: Yuan-Ting Hsieh (謝沅廷) <[email protected]>
Co-authored-by: Ziyue Xu <[email protected]>

examples/advanced/xgboost/data_job_setup.ipynb

@@ -65,7 +65,7 @@
    "outputs": [],
    "source": [
     "# please change this DATASET_ROOT to the correct path containing HIGGS dataset\n",
-    "%env DATASET_ROOT=/data\n",
+    "%env DATASET_ROOT=$HOME/dataset\n",
     "!python3 utils/prepare_data_split.py \\\n",
     "        --data_path \"${DATASET_ROOT}/HIGGS.csv\" \\\n",
     "        --site_num 5 \\\n",
@@ -96,15 +96,15 @@
     "%env DATA_SPLIT_ROOT=/tmp/nvflare/xgboost/HIGGS/data_splits/\n",
     "!python3 utils/prepare_job_config.py \\\n",
     "        --site_num 5 \\\n",
-    "        --training_mode bagging \\\n",
+    "        --training_algo bagging \\\n",
     "        --split_method uniform \\\n",
     "        --lr_mode uniform \\\n",
     "        --nthread 16 \\\n",
     "        --tree_method \"hist\" \\\n",
     "        --data_root \"${DATA_SPLIT_ROOT}\"\n",
     "!python3 utils/prepare_job_config.py \\\n",
     "        --site_num 5 \\\n",
-    "        --training_mode histogram \\\n",
+    "        --training_algo histogram \\\n",
     "        --split_method uniform \\\n",
     "        --lr_mode uniform \\\n",
     "        --nthread 16 \\\n",