<reponame>Ascend/modelzoo
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
# Copyright 2020 Huawei Technologies Co., Ltd
#
# 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 detectron2.layers import ShapeSpec
from detectron2.utils.registry import Registry

from .backbone import Backbone

BACKBONE_REGISTRY = Registry("BACKBONE")
BACKBONE_REGISTRY.__doc__ = """
Registry for backbones, which extract feature maps from images

The registered object must be a callable that accepts two arguments:

1. A :class:`detectron2.config.CfgNode`
2. A :class:`detectron2.layers.ShapeSpec`, which contains the input shape specification.

It must returns an instance of :class:`Backbone`.
"""


def build_backbone(cfg, input_shape=None):
    """
    Build a backbone from `cfg.MODEL.BACKBONE.NAME`.

    Returns:
        an instance of :class:`Backbone`
    """
    if input_shape is None:
        input_shape = ShapeSpec(channels=len(cfg.MODEL.PIXEL_MEAN))

    backbone_name = cfg.MODEL.BACKBONE.NAME
    backbone = BACKBONE_REGISTRY.get(backbone_name)(cfg, input_shape)
    assert isinstance(backbone, Backbone)
    return backbone

# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
# Copyright 2020 Huawei Technologies Co., Ltd
#
# 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 detectron2.layers import ShapeSpec
from detectron2.utils.registry import Registry

from .backbone import Backbone

BACKBONE_REGISTRY = Registry("BACKBONE")
BACKBONE_REGISTRY.__doc__ = """
Registry for backbones, which extract feature maps from images

The registered object must be a callable that accepts two arguments:

1. A :class:`detectron2.config.CfgNode`
2. A :class:`detectron2.layers.ShapeSpec`, which contains the input shape specification.

It must returns an instance of :class:`Backbone`.
"""


def build_backbone(cfg, input_shape=None):
    """
    Build a backbone from `cfg.MODEL.BACKBONE.NAME`.

    Returns:
        an instance of :class:`Backbone`
    """
    if input_shape is None:
        input_shape = ShapeSpec(channels=len(cfg.MODEL.PIXEL_MEAN))

    backbone_name = cfg.MODEL.BACKBONE.NAME
    backbone = BACKBONE_REGISTRY.get(backbone_name)(cfg, input_shape)
    assert isinstance(backbone, Backbone)
    return backbone
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved # Copyright 2020 Huawei Technologies Co., Ltd # # 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. Registry for backbones, which extract feature maps from images  The registered object must be a callable that accepts two arguments:  1. A :class:`detectron2.config.CfgNode` 2. A :class:`detectron2.layers.ShapeSpec`, which contains the input shape specification.  It must returns an instance of :class:`Backbone`. Build a backbone from `cfg.MODEL.BACKBONE.NAME`.      Returns:         an instance of :class:`Backbone`