code: def _make_connectome():
      adj = np.diag([1.5, 0.3, 2.5], 2)
      adj += adj.T
      adj += np.eye(5)
  
      coord = np.arange(5)
      coord = np.asarray([coord * 10, -coord, coord[::-1]]).T
      return adj, coord
  
file_path: nilearn/nilearn/plotting/tests/test_html_connectome.py
imports: import json
  import numpy
  import pytest
  from nilearn.plotting import html_connectome
  from nilearn.plotting.js_plotting_utils import decode
  from .test_js_plotting_utils import check_html
label_desc: Use image node_id 3 for calling a global function with example usage: _make_connectome() and returns: adj,  coord