Change the unzip option and fix the file path

Author: xzhou33

introduction_to_amazon_algorithms/object_detection_pascalvoc_coco/object_detection_image_json_format.ipynb

@@ -146,8 +146,8 @@
    "outputs": [],
    "source": [
     "%%bash\n",
-    "unzip -q val2017.zip\n",
-    "unzip -q annotations_trainval2017.zip\n",
+    "unzip -qo val2017.zip\n",
+    "unzip -qo annotations_trainval2017.zip\n",
     "rm val2017.zip annotations_trainval2017.zip"
    ]
   },
@@ -287,10 +287,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# jsons = os.listdir('generated')\n",
     "import os\n",
     "import json\n",
-    "jsons = os.listdir('validation_annotation')\n",
+    "jsons = os.listdir('generated')\n",
     "\n",
     "print ('There are {} images have annotation files'.format(len(jsons)))"
    ]