update classification data save path

Author: mmiakashs

notebooks/examples/step2_classification.ipynb

@@ -294,7 +294,7 @@
    "outputs": [],
    "source": [
     "# Create output directory\n",
-    "output_dir = examples_dir / 'data' / 'step2_classification'\n",
+    "output_dir = examples_dir / '.data' / 'step2_classification'\n",
     "output_dir.mkdir(parents=True, exist_ok=True)\n",
     "\n",
     "# Save classified document\n",