update ipcmagic syntax

Author: rsarm

hpctestlib/interactive/jupyter/ipcmagic/src/tf-hvd-sgd-ipc-tf2.ipynb

@@ -25,7 +25,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%ipcluster start -n 2 --mpi"
+    "%ipcluster start -n 2"
    ]
   },
   {
@@ -43,7 +43,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%ipcluster start -n 2 --mpi"
+    "%ipcluster start -n 2"
    ]
   },
   {
@@ -52,7 +52,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%ipcluster start -n 2 --mpi"
+    "%ipcluster start -n 2"
    ]
   },
   {
@@ -61,7 +61,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%ipcluster start -n 2 --mpi"
+    "%ipcluster start -n 2"
    ]
   },
   {
@@ -70,7 +70,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%ipcluster start -n 2 --mpi"
+    "%ipcluster start -n 2"
    ]
   },
   {
@@ -94,6 +94,15 @@
     "print('cluster ids:', c.ids)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "c.close()"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,