update imag_time_evo.ipynb

Author: PeilinZHENG

docs/source/tutorials/imag_time_evo.ipynb

@@ -209,16 +209,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "No GPU/TPU found, falling back to CPU. (Set TF_CPP_MIN_LOG_LEVEL=0 and rerun for more info.)\n"
-     ]
-    }
-   ],
+   "execution_count": null,
+   "outputs": [],
    "source": [
     "def b2s(bit):\n",
     "    return 1 - 2 * int(bit)\n",
@@ -240,11 +232,7 @@
     "Hv = construct_Ham()"
    ],
    "metadata": {
-    "collapsed": false,
-    "ExecuteTime": {
-     "end_time": "2023-07-13T02:33:37.975017500Z",
-     "start_time": "2023-07-13T02:33:37.740165Z"
-    }
+    "collapsed": false
    }
   },
   {