Add comment strings.

01_Create_Model.ipynb

@@ -95,10 +95,12 @@
     "\n",
     "    \n",
     "def score_rank(scores):\n",
+    "    \"\"\"Compute the ranks of the scores.\"\"\"\n",
     "    return pd.Series(scores).rank(ascending=False)\n",
     "\n",
     "\n",
     "def label_index(label, label_order):\n",
+    "    \"\"\"Compute the index of label in label_order.\"\"\"\n",
     "    loc = np.where(label == label_order)[0]\n",
     "    if loc.shape[0] == 0:\n",
     "        return None\n",
@@ -106,6 +108,7 @@
     "\n",
     "\n",
     "def label_rank(label, scores, label_order):\n",
+    "    \"\"\"Compute the rank of label using the scores.\"\"\"\n",
     "    loc = label_index(label, label_order)\n",
     "    if loc is None:\n",
     "        return len(scores) + 1\n",