code: def gradient_data(nB, nO):
      return numpy.zeros((nB, nO), dtype="f") - 1.0
  
imports: from functools import partial
  import numpy
  import pytest
  from numpy.testing import assert_allclose
  from thinc.api import Linear, NumpyOps, Relu, chain
label_desc: Use image node_id 8 for calling a global function with example usage: gradient_data(nB, nO) and returns: unknown