This is the code repository for the paper A Persistent Spatial Semantic Representation for High-level Natural Language Instruction Execution.

Tested on Ubuntu 20.04.

conda env create -f hlsm-alfred.yml
conda activate hlsm-alfred

1. Create a workspace directory somewhere on your system to store models, checkpoints, data, alfred source, etc. Collecting training data requires ~600GB of space. SSD preferred for faster training.

mkdir <workspace dir>

2. Update the WS_DIR variable in init.sh to point to <workspace_dir>.

3. Clone ALFRED into sub-directory alfred_src in the workspace:

cd <workspace dir>
mkdir alfred_src
cd alfred_src
git clone https://github.com/askforalfred/alfred.git

4. Define environment variables. Do this before running every script in this repo.

source init.sh

5. (Optional) Download pre-trained models from this Google Drive link and save them into <workspace_dir>/models.

Most scripts in this repo are parameterized by a single argument that specifies a json configuration file stored in lgp/experiment_definitions, excluding the .json file extension. To change hyperparameters, datasets, or models, you can modify the existing .json configurations or create your own. The configuration files support a special @include directive that allows recursively including other configuration files (useful to share parameters among multiple configurations).

Training data consists of two datasets extracted from oracle rollouts in the ALFRED environment. The subgoal dataset consists of examples of semantic maps at the start of each navigation+manipulation sequence labelled with subgoals. The navigation dataset consists of RGB images, ground-truth depth and segmentation, and 2D affordance feature maps at every timestep labelled with navigation goal poses.

The following command will execute the oracle actions on every training environment in ALFRED, and store the data into <workspace_dir>/data/rollouts. It will take a few days to run. Incase the process is interrupted, run it again to resume data collection.

python main/collect_universal_rollouts.py alfred/collect_universal_rollouts

Trained models are stored in <workspace_dir>/models. If you downloaded the models above, you can skip these training steps and proceed to evaluation.

1. Train the high-level controller (subgoal model) for 6 epochs:

python main/train_supervised.py alfred/train_subgoal_model

2. Train the low-level controller's navigation model for 6 epochs:

python main/train_supervised.py alfred/train_navigation_model

3. Train the semantic segmentation model for 5 epochs:

python main/train_supervised.py alfred/train_segmentation_model

4. Train the depth prediction model for 4 epochs:

python main/train_supervised.py alfred/train_depth_model

Tensorboard summaries are written to workspace_dir/data/runs.

main/rollout_and_evaluate.py is the main evaluation script. Call it with different configurations to evaluate on the different data splits.

To evaluate on valid_unseen, run:

python main/rollout_and_evaluate.py alfred/eval/hlsm_full/eval_hlsm_valid_unseen

To evaluate on valid_seen, run:

python main/rollout_and_evaluate.py alfred/eval/hlsm_full/eval_hlsm_valid_seen

To evaluate on both test splits and collect traces for leaderboard, run:

python main/rollout_and_evaluate.py alfred/eval/hlsm_full/eval_hlsm_test

Explore the other configurations available at experiment_definitions/alfred/eval.

Expected results: