# LICENSE HEADER MANAGED BY add-license-header
#
# Copyright 2018 Kornia Team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

from __future__ import annotations

import torch


def compute_patch_abs_error(x: torch.Tensor, y: torch.Tensor, h: int, w: int) -> torch.Tensor:
    """Compute the absolute error between patches."""
    return torch.abs(x - y)[..., h // 4 : -h // 4, w // 4 : -w // 4].mean()