def METHOD_NAME(self, feature_maps, image_size):
    anchors = []
    for k, f in enumerate(feature_maps):
        for i, j in itertools.product(range(f[0]), range(f[1])):
            if k == 0:
                anchors.extend(self.calculate_anchors_zero_level(j, i, self.min_sizes[k],
                                                                 image_size, self.steps[k]))
            else:
                anchors.extend(self.calculate_anchors([j + 0.5], [i + 0.5], self.min_sizes[k][0],
                                                      image_size, self.steps[k]))
    anchors = np.clip(anchors, 0, 1)
    return anchors