Fixing dataset import

day_3/ex_01_validation.ipynb

@@ -1561,7 +1561,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "pr_import = Project(\"../datasets/imported_datasets\")"
+    "pr_import = Project("../../datasets")\n",
+    "if len(pr_import.job_table()) == 0:\n",
+    "    pr_import.unpack("Cu_training_archive")"
    ]
   },
   {