forked from PulseFocusPlatform/PulseFocusPlatform
106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
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# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import paddle
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from ppdet.core.workspace import register, create
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from .meta_arch import BaseArch
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__all__ = ['FCOS']
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@register
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class FCOS(BaseArch):
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"""
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FCOS network, see https://arxiv.org/abs/1904.01355
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Args:
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backbone (object): backbone instance
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neck (object): 'FPN' instance
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fcos_head (object): 'FCOSHead' instance
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post_process (object): 'FCOSPostProcess' instance
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"""
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__category__ = 'architecture'
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__inject__ = ['fcos_post_process']
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def __init__(self,
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backbone,
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neck,
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fcos_head='FCOSHead',
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fcos_post_process='FCOSPostProcess'):
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super(FCOS, self).__init__()
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self.backbone = backbone
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self.neck = neck
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self.fcos_head = fcos_head
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self.fcos_post_process = fcos_post_process
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@classmethod
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def from_config(cls, cfg, *args, **kwargs):
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backbone = create(cfg['backbone'])
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kwargs = {'input_shape': backbone.out_shape}
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neck = create(cfg['neck'], **kwargs)
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kwargs = {'input_shape': neck.out_shape}
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fcos_head = create(cfg['fcos_head'], **kwargs)
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return {
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'backbone': backbone,
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'neck': neck,
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"fcos_head": fcos_head,
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}
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def _forward(self):
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body_feats = self.backbone(self.inputs)
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fpn_feats = self.neck(body_feats)
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fcos_head_outs = self.fcos_head(fpn_feats, self.training)
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if not self.training:
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scale_factor = self.inputs['scale_factor']
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bboxes = self.fcos_post_process(fcos_head_outs, scale_factor)
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return bboxes
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else:
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return fcos_head_outs
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def get_loss(self, ):
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loss = {}
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tag_labels, tag_bboxes, tag_centerness = [], [], []
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for i in range(len(self.fcos_head.fpn_stride)):
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# labels, reg_target, centerness
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k_lbl = 'labels{}'.format(i)
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if k_lbl in self.inputs:
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tag_labels.append(self.inputs[k_lbl])
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k_box = 'reg_target{}'.format(i)
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if k_box in self.inputs:
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tag_bboxes.append(self.inputs[k_box])
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k_ctn = 'centerness{}'.format(i)
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if k_ctn in self.inputs:
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tag_centerness.append(self.inputs[k_ctn])
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fcos_head_outs = self._forward()
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loss_fcos = self.fcos_head.get_loss(fcos_head_outs, tag_labels,
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tag_bboxes, tag_centerness)
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loss.update(loss_fcos)
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total_loss = paddle.add_n(list(loss.values()))
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loss.update({'loss': total_loss})
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return loss
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def get_pred(self):
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bbox_pred, bbox_num = self._forward()
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output = {'bbox': bbox_pred, 'bbox_num': bbox_num}
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return output
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