Method GradientChecker

include/caffe/test/test_gradient_check_util.hpp:24–28

kink and kink_range specify an ignored nonsmooth region of the form kink - kink_range <= |feature value| <= kink + kink_range, which accounts for all nonsmoothness in use by caffe

  // kink - kink_range <= |feature value| <= kink + kink_range,
  // which accounts for all nonsmoothness in use by caffe
  GradientChecker(const Dtype stepsize, const Dtype threshold,
      const unsigned int seed = 1701, const Dtype kink = 0.,
      const Dtype kink_range = -1)
      : stepsize_(stepsize), threshold_(threshold), seed_(seed),
        kink_(kink), kink_range_(kink_range) {}
  // Checks the gradient of a layer, with provided bottom layers and top
  // layers.
  // Note that after the gradient check, we do not guarantee that the data