Merge pull request #2 from DanilSavine/master

Update exercise8.ipynb

Author: MitchMG2

Exercise8/exercise8.ipynb

@@ -544,7 +544,7 @@
     "    ----------\n",
     "    params : array_like\n",
     "        The parameters which will be optimized. This is a one\n",
-    "        dimensional vector of shape (num_movies x num_users, 1). It is the \n",
+    "        dimensional vector of shape (num_movies * num_features + num_users * num_features, 1). It is the \n",
     "        concatenation of the feature vectors X and parameters Theta.\n",
     "    \n",
     "    Y : array_like\n",
@@ -573,7 +573,7 @@
     "    \n",
     "    grad : array_like\n",
     "        The gradient vector of the cost function at the given params.\n",
-    "        grad has a shape (num_movies x num_users, 1)\n",
+    "        grad has a shape (num_movies * num_features + num_users * num_features, 1)\n",
     "    \n",
     "    Instructions\n",
     "    ------------\n",