Fix keras example

MarkDaoust · MarkDaoust · commit 166ca5d08a92 · 2018-07-19T09:25:09.000-07:00
diff --git a/samples/core/guide/autograph.ipynb b/samples/core/guide/autograph.ipynb
@@ -679,7 +679,7 @@
         "def collatz(x):\n",
         "  x=tf.reshape(x,())\n",
         "  assert x>0\n",
-        "  n = tf.convert_to_tensor(0) \n",
+        "  n = tf.convert_to_tensor((0,)) \n",
         "  while not tf.equal(x,1):\n",
         "    n+=1\n",
         "    if tf.equal(x%2, 0):\n",
