diff --git a/probability.ipynb b/probability.ipynb
index 365039874..028c17bde 100644
--- a/probability.ipynb
+++ b/probability.ipynb
@@ -404,7 +404,9 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(enumerate_joint)"
@@ -622,6 +624,7 @@
        "<IPython.core.display.HTML object>"
       ]
      },
+     "execution_count": 18,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -683,7 +686,9 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(BayesNode)"
@@ -790,7 +795,9 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(BayesNet)"
@@ -904,7 +911,9 @@
   {
    "cell_type": "code",
    "execution_count": 26,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(enumerate_all)"
@@ -1145,7 +1154,9 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(Factor.pointwise_product)"
@@ -1630,7 +1641,9 @@
   {
    "cell_type": "code",
    "execution_count": 28,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "%psource HiddenMarkovModel"
@@ -1646,7 +1659,9 @@
   {
    "cell_type": "code",
    "execution_count": 3,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "umbrella_transition_model = [[0.7, 0.3], [0.3, 0.7]]\n",
@@ -1691,7 +1706,9 @@
   {
    "cell_type": "code",
    "execution_count": 29,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(forward)"
@@ -1754,7 +1771,9 @@
   {
    "cell_type": "code",
    "execution_count": 30,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "psource(backward)"
@@ -1793,7 +1812,9 @@
   {
    "cell_type": "code",
    "execution_count": 50,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "pseudocode('Forward-Backward')"
@@ -1840,11 +1861,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
-  },
-  "widgets": {
-   "state": {},
-   "version": "1.1.1"
+   "version": "3.6.1"
   }
  },
  "nbformat": 4,