Use the following code to load items in the 2D_Lattice.csv file
import pandas as pd
import json
df = pd.read_csv('2D_Lattice.csv')
row = 0
box = df.iloc[row,1]
array = np.array(json.loads(box))
Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference