Fix datastat name mismatch (#1255)

Fixes #1253 .

### Description
A few sentences describing the changes proposed in this pull request.

### Checks
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Avoid including large-size files in the PR.
- [x] Clean up long text outputs from code cells in the notebook.
- [x] For security purposes, please check the contents and remove any
sensitive info such as user names and private key.
- [x] Ensure (1) hyperlinks and markdown anchors are working (2) use
relative paths for tutorial repo files (3) put figure and graphs in the
`./figure` folder
- [ ] Notebook runs automatically `./runner.sh -t <path to .ipynb file>`

Signed-off-by: Mingxin Zheng <[email protected]>

Author: mingxin-zheng

auto3dseg/notebooks/ensemble_byoc.ipynb

@@ -213,7 +213,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "da = DataAnalyzer(datalist_file, dataroot_dir)\n",
+    "data_stats_filename = os.path.join(work_dir, \"datastats.yaml\")\n",
+    "da = DataAnalyzer(datalist_file, dataroot_dir, output_path=data_stats_filename)\n",
     "da.get_all_case_stats()\n",
     "\n",
     "input = {\n",
@@ -225,7 +226,7 @@
     "input_cfg = \"input.yaml\"\n",
     "ConfigParser.export_config_file(input, input_cfg)\n",
     "\n",
-    "bundle_generator = BundleGen(algo_path=work_dir, data_stats_filename=\"data_stats.yaml\", data_src_cfg_name=input_cfg)\n",
+    "bundle_generator = BundleGen(algo_path=work_dir, data_stats_filename=data_stats_filename, data_src_cfg_name=input_cfg)\n",
     "bundle_generator.generate(work_dir, num_fold=2)\n",
     "history = bundle_generator.get_history()\n",
     "\n",