code: def adjacency():
      """Adjacency matrix symmetric up to 1e-3 relative tolerance."""
      return np.array(
          [
              [1.0, -2.0, 0.3, 0.0],
              [-2.002, 1, 0.0, 0.0],
              [0.3, 0.0, 1.0, 0.0],
              [0.0, 0.0, 0.0, 1.0],
          ]
      )
  
imports: import os
  import matplotlib.pyplot
  import numpy
  import pytest
  from matplotlib.patches import FancyArrow
  from scipy import sparse
  from nilearn.plotting import plot_connectome
label_desc: Use image node_id 1 for calling a global function with example usage: adjacency() and returns: np