Environment Setup

We use Anaconda to install required packages:
```
    conda env create -f env/env_equiformer.yml
```
This will create a new environment called equiformer.

We activate the environment:

    export PYTHONNOUSERSITE=True    # prevent using packages from base
    conda activate equiformer

Besides, env/env_equiformer.yml specifies versions of all packages.
After setting up the environment, clone OC20 repository and install ocpmodels:
```
    git clone https://github.com/Open-Catalyst-Project/ocp
    cd ocp
    git checkout b5a197f
    pip install -e .
```
The version of ocpmodels used here is 0.0.3. The correpsonding version of GitHub repository is here.