update pretrained weight for vln-ce

Downstream/Visual-Language-Navigation/README.md

@@ -10,7 +10,9 @@ We currently provide evaluation of our pretrained model.
 2. Follow https://github.com/openai/CLIP to install CLIP.
 
 ### Data/Model preperation
-The pretrained models and data for running the code will be released soon.
+1. Follow https://github.com/jacobkrantz/VLN-CE to download Matterport3D environment to `data/scene_datasets`. Data ahould have the form `data/scene_datasets/mp3d/{scene}/{scene}.glb`.
+2. Download preporcessed VLN-CE dataset from  https://pjlab-gvm-data.oss-cn-shanghai.aliyuncs.com/internvideo/vln/dataset.zip to `data/datasets`. Data should have the form `data/datasets/R2R_VLNCE_v1-2_preprocessed_BERTidx/{split}` and `data/datasets/R2R_VLNCE_v1-2_preprocessed/{split}`.
+3. Download pretrained models from  https://pjlab-gvm-data.oss-cn-shanghai.aliyuncs.com/internvideo/vln/pretrained.zip to `pretrained`. It should have 6 folders: `pretrained/pretrained_models`, `pretrained/VideoMAE`, `pretrained/wp_pred`, `pretrained/ddppo-models`, `pretrained/Prevalent`, `pretrained/wp_pred`.
 
 ### Running the code
 Simply run `bash eval_**.sh` to start evaluating the agent.