Update README.md

```

Each run takes ~4 hours to reach 150 steps on 4 H100s. You can decrease testing frequency to speed up training. Training might be unstable due to loss spikes; we recommend restoring from the latest checkpoint when encountering such cases. We will resolve this issue in future work (see roadmap).

### Navigation

```

# Additional dependencies:

pip install ai2thor==5.0.0

pip install numpy==1.25.1

# For headless servers, additional setup is required:

# Install required packages

apt-get install -y pciutils

apt-get install -y xorg xserver-xorg-core xserver-xorg-video-dummy

# Start X server in a tmux window

python vagen/env/navigation/startx.py 1

# In another terminal, run:

bash vagen/examples/debug_navigation_vision/run.sh

```

## Algorithm Settings

| Setting           | GRPO | GAE | Bi-Level GAE | Turn-Wise GAE | Masked-GAE |