Update book-recommender-exercises.ipynb

dss-2016/recommendation-systems/book-recommender-exercises.ipynb

@@ -172,7 +172,7 @@
    "source": [
     "This dataset has multiple rows corresponding to the same book, e.g., in situations where reprintings were done by different publishers in different year.\n",
     "\n",
-    "For each unique value of 'book' in the `items` SFrame, select one of the of the available values for `author`, `publisher`, and `year`. Hint: Try using [`SFrame.groupby`](http://turi.com/products/create/docs/graphlab.data_structures.html#module-graphlab.aggregate) and [`gl.aggregate.SELECT_ONE`](http://turi.com/products/create/docs/graphlab.data_structures.html#graphlab.aggregate.SELECT_ONE)."
+    "For each unique value of 'book' in the `items` SFrame, select one of the of the available values for `author`, `publisher`, and `year`. Hint: Try using [`SFrame.groupby`](https://turi.com/products/create/docs/graphlab.data_structures.html#module-graphlab.aggregate) and [`gl.aggregate.SELECT_ONE`](https://turi.com/products/create/docs/graphlab.data_structures.html#graphlab.aggregate.SELECT_ONE)."
    ]
   },
   {
@@ -259,7 +259,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Create a train/test split of the `implicit` data created above. Hint: Use [random_split_by_user](http://graphlab.com/products/create/docs/generated/graphlab.recommender.random_split_by_user.html#graphlab.recommender.random_split_by_user)."
+    "Create a train/test split of the `implicit` data created above. Hint: Use [random_split_by_user](https://turi.com/products/create/docs/generated/graphlab.recommender.random_split_by_user.html#graphlab.recommender.random_split_by_user)."
    ]
   },
   {