Fix mrcnn tf2 notebook (#130)

* update file pattern

* drop empty line

Author: ChaiBapchya

training/distributed_training/tensorflow/data_parallel/maskrcnn/tensorflow2_smdataparallel_maskrcnn_demo.ipynb

@@ -217,15 +217,14 @@
     "    \"total_steps\": 500,\n",
     "    \"train_batch_size\": 4,\n",
     "    \"eval_batch_size\": 8,\n",
-    "    \"training_file_pattern\": '/'.join([SM_DATA_ROOT, 'train/train*.tfrecord']), \n",
-    "    \"validation_file_pattern\": '/'.join([SM_DATA_ROOT, 'val/val*.tfrecord']), \n",
+    "    \"training_file_pattern\": '/'.join([SM_DATA_ROOT, 'train']), \n",
+    "    \"validation_file_pattern\": '/'.join([SM_DATA_ROOT, 'val']), \n",
     "    \"val_json_file\": '/'.join([SM_DATA_ROOT, 'annotations/instances_val2017.json']),    \n",
     "    \"amp\": '',\n",
     "    \"use_batched_nms\": '',\n",
     "    \"xla\": '',\n",
     "    \"nouse_custom_box_proposals_op\": '',\n",
     "    \"seed\": 987\n",
-    "    \n",
     "    }"
    ]
   },
@@ -324,4 +323,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}