Changed key name for image channel. Fixed the recordio upload

Author: xzhou33

introduction_to_amazon_algorithms/object_detection_pascalvoc_coco/object_detection_image_json_format.ipynb

@@ -341,8 +341,8 @@
    "source": [
     "%%time\n",
     "\n",
-    "train_channel = prefix + '/train_img'\n",
-    "validation_channel = prefix + '/validation_img'\n",
+    "train_channel = prefix + '/train'\n",
+    "validation_channel = prefix + '/validation'\n",
     "train_annotation_channel = prefix + '/train_annotation'\n",
     "validation_annotation_channel = prefix + '/validation_annotation'\n",
     "\n",

introduction_to_amazon_algorithms/object_detection_pascalvoc_coco/object_detection_recordio_format.ipynb

@@ -212,8 +212,8 @@
     "train_channel = prefix + '/train'\n",
     "validation_channel = prefix + '/validation'\n",
     "\n",
-    "# sess.upload_data(path='VOCdevkit/train.rec', bucket=bucket, key_prefix=train_channel)\n",
-    "# sess.upload_data(path='VOCdevkit/val.rec', bucket=bucket, key_prefix=validation_channel)\n",
+    "sess.upload_data(path='VOCdevkit/train.rec', bucket=bucket, key_prefix=train_channel)\n",
+    "sess.upload_data(path='VOCdevkit/val.rec', bucket=bucket, key_prefix=validation_channel)\n",
     "\n",
     "s3_train_data = 's3://{}/{}'.format(bucket, train_channel)\n",
     "s3_validation_data = 's3://{}/{}'.format(bucket, validation_channel)"