code: def model3(nO):
      return Linear(nO, nO)
  
imports: import numpy
  import pytest
  from numpy.testing import assert_allclose
  from thinc.api import Dropout, Linear, Model, NumpyOps, add, clone, concatenate, map_list, noop
  from thinc.layers import chain, tuplify
label_desc: Use image node_id 7 for calling a global function with example usage: model3(nO) and returns: Linear