Fix Gluon example (#2764)

Signed-off-by: Albert Wolant <[email protected]>

Author: awolant

docs/examples/frameworks/mxnet/gluon.ipynb

@@ -90,7 +90,7 @@
     "@pipeline_def\n",
     "def gluon_pipe():\n",
     "    jpegs, labels = fn.readers.file(\n",
-    "        file_root=data_path + '/lfw-deepfunneled/', random_shuffle = True, pad_last_batch=True)\n",
+    "        name='Reader', file_root=data_path + '/lfw-deepfunneled/', random_shuffle = True, pad_last_batch=True)\n",
     "    images = fn.decoders.image(jpegs, device='mixed')\n",
     "    images = fn.resize(\n",
     "        images, resize_x=target_wd, resize_y=target_ht, interp_type=types.INTERP_LINEAR)\n",