1. Shell and python file to only download image chat data. 2. Updated… (

#2381)

* 1. Shell and python file to only download image chat data. 2. Updated readme

* Adding Copyright

* incorporating pylint suggestions

* running autoformat.sh

* related to #2381. rolling back after autoformat

* lint suggestions

* lint suggestions

parlai/tasks/image_chat/README.md

@@ -6,3 +6,4 @@ Tags: #Image_Chat, #All, #Visual, #ChitChat
 
 Notes: If you have already downloaded the images, please specify with the `--yfcc-path` flag, as the image download script takes a very long time to run
 
+If you just want to download data, run as `./parlai/tasks/image_chat/download_data.sh`. Change the required `$DATA_DIR` variable to where you want to save the file. Defaults to `/tmp`. It basically calls the wrapper `parlai/tasks/image_chat/download_data.py`  

parlai/tasks/image_chat/download_data.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# Copyright (c) Facebook, Inc. and its affiliates.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+import argparse
+from parlai.tasks.image_chat.build import build
+
+
+def parse_args():
+    """
+    Wrapper to parse CLI arguments.
+
+    :return: args
+    """
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-dp", "--datapath", default="/tmp", help="Path where to save data."
+    )
+
+    args = parser.parse_args()
+    # opts is dic in parlai
+    args = vars(args)
+
+    return args
+
+
+if __name__ == "__main__":
+    opt = parse_args()
+    # Only datapath is required by build.
+    # Using build function to check the version and
+    # internal hash
+    build(opt)

parlai/tasks/image_chat/download_data.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# Copyright (c) Facebook, Inc. and its affiliates.
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+export CURRENT_DIR=${PWD}
+# Should return the ParlAI clone path
+echo "Running code from: " $CURRENT_DIR
+
+export DATA_DIR=/tmp/
+mkdir -p $DATA_DIR
+echo "Downloading in data root: " $DATA_DIR
+
+PYTHONPATH=. python parlai/tasks/image_chat/download_data.py \
+-dp $DATA_DIR