code: def __call__(self, weights, grad):
      self.weights = weights
      self.d_weights = grad
  
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 2 for calling the GradientSpy obj's underlying member method code with example usage: obj.__call__(weights, grad) without return types