code: def _convert_affinematrix_to_homography_impl(A: Tensor) -> Tensor:
      H: Tensor = pad(A, [0, 0, 0, 1], "constant", value=0.0)
      H[..., -1, -1] += 1.0
      return H
  
imports: from __future__ import annotations
  from typing import Optional
  import torch
  import torch.nn.functional
  from kornia.constants import pi
  from kornia.core import Tensor, concatenate, cos, pad, sin, stack, tensor, where, zeros_like
  from kornia.core.check import KORNIA_CHECK, KORNIA_CHECK_SHAPE
  from kornia.utils import deprecated
  from kornia.utils.helpers import _torch_inverse_cast
label_desc: Use image node_id 7 for calling a global function with example usage: _convert_affinematrix_to_homography_impl(A) and returns: H