import numpy as np
from scipy import sparse

expected = np.array(
    [
        [10.0, 0.0, 0.0, 2.5],
        [0.0, 3.0, 0.0, 0.0],
        [4.5, 0.0, 8.0, 0.0],
    ]
)
restored = sparse.load_npz("feature_matrix.npz")