Spaces:
Running
on
Zero
Running
on
Zero
| # Copyright (c) OpenMMLab. All rights reserved. | |
| import copy | |
| from mmcv.cnn import ConvModule | |
| from torch.nn.modules.batchnorm import _BatchNorm | |
| from mmpose.registry import MODELS | |
| from .base_backbone import BaseBackbone | |
| from .utils import InvertedResidual | |
| class ViPNAS_MobileNetV3(BaseBackbone): | |
| """ViPNAS_MobileNetV3 backbone. | |
| "ViPNAS: Efficient Video Pose Estimation via Neural Architecture Search" | |
| More details can be found in the `paper | |
| <https://arxiv.org/abs/2105.10154>`__ . | |
| Args: | |
| wid (list(int)): Searched width config for each stage. | |
| expan (list(int)): Searched expansion ratio config for each stage. | |
| dep (list(int)): Searched depth config for each stage. | |
| ks (list(int)): Searched kernel size config for each stage. | |
| group (list(int)): Searched group number config for each stage. | |
| att (list(bool)): Searched attention config for each stage. | |
| stride (list(int)): Stride config for each stage. | |
| act (list(dict)): Activation config for each stage. | |
| conv_cfg (dict): Config dict for convolution layer. | |
| Default: None, which means using conv2d. | |
| norm_cfg (dict): Config dict for normalization layer. | |
| Default: dict(type='BN'). | |
| frozen_stages (int): Stages to be frozen (all param fixed). | |
| Default: -1, which means not freezing any parameters. | |
| norm_eval (bool): Whether to set norm layers to eval mode, namely, | |
| freeze running stats (mean and var). Note: Effect on Batch Norm | |
| and its variants only. Default: False. | |
| with_cp (bool): Use checkpoint or not. Using checkpoint will save | |
| some memory while slowing down the training speed. | |
| Default: False. | |
| init_cfg (dict or list[dict], optional): Initialization config dict. | |
| Default: | |
| ``[ | |
| dict(type='Normal', std=0.001, layer=['Conv2d']), | |
| dict( | |
| type='Constant', | |
| val=1, | |
| layer=['_BatchNorm', 'GroupNorm']) | |
| ]`` | |
| """ | |
| def __init__( | |
| self, | |
| wid=[16, 16, 24, 40, 80, 112, 160], | |
| expan=[None, 1, 5, 4, 5, 5, 6], | |
| dep=[None, 1, 4, 4, 4, 4, 4], | |
| ks=[3, 3, 7, 7, 5, 7, 5], | |
| group=[None, 8, 120, 20, 100, 280, 240], | |
| att=[None, True, True, False, True, True, True], | |
| stride=[2, 1, 2, 2, 2, 1, 2], | |
| act=['HSwish', 'ReLU', 'ReLU', 'ReLU', 'HSwish', 'HSwish', 'HSwish'], | |
| conv_cfg=None, | |
| norm_cfg=dict(type='BN'), | |
| frozen_stages=-1, | |
| norm_eval=False, | |
| with_cp=False, | |
| init_cfg=[ | |
| dict(type='Normal', std=0.001, layer=['Conv2d']), | |
| dict(type='Constant', val=1, layer=['_BatchNorm', 'GroupNorm']) | |
| ], | |
| ): | |
| # Protect mutable default arguments | |
| norm_cfg = copy.deepcopy(norm_cfg) | |
| super().__init__(init_cfg=init_cfg) | |
| self.wid = wid | |
| self.expan = expan | |
| self.dep = dep | |
| self.ks = ks | |
| self.group = group | |
| self.att = att | |
| self.stride = stride | |
| self.act = act | |
| self.conv_cfg = conv_cfg | |
| self.norm_cfg = norm_cfg | |
| self.frozen_stages = frozen_stages | |
| self.norm_eval = norm_eval | |
| self.with_cp = with_cp | |
| self.conv1 = ConvModule( | |
| in_channels=3, | |
| out_channels=self.wid[0], | |
| kernel_size=self.ks[0], | |
| stride=self.stride[0], | |
| padding=self.ks[0] // 2, | |
| conv_cfg=conv_cfg, | |
| norm_cfg=norm_cfg, | |
| act_cfg=dict(type=self.act[0])) | |
| self.layers = self._make_layer() | |
| def _make_layer(self): | |
| layers = [] | |
| layer_index = 0 | |
| for i, dep in enumerate(self.dep[1:]): | |
| mid_channels = self.wid[i + 1] * self.expan[i + 1] | |
| if self.att[i + 1]: | |
| se_cfg = dict( | |
| channels=mid_channels, | |
| ratio=4, | |
| act_cfg=(dict(type='ReLU'), | |
| dict(type='HSigmoid', bias=1.0, divisor=2.0))) | |
| else: | |
| se_cfg = None | |
| if self.expan[i + 1] == 1: | |
| with_expand_conv = False | |
| else: | |
| with_expand_conv = True | |
| for j in range(dep): | |
| if j == 0: | |
| stride = self.stride[i + 1] | |
| in_channels = self.wid[i] | |
| else: | |
| stride = 1 | |
| in_channels = self.wid[i + 1] | |
| layer = InvertedResidual( | |
| in_channels=in_channels, | |
| out_channels=self.wid[i + 1], | |
| mid_channels=mid_channels, | |
| kernel_size=self.ks[i + 1], | |
| groups=self.group[i + 1], | |
| stride=stride, | |
| se_cfg=se_cfg, | |
| with_expand_conv=with_expand_conv, | |
| conv_cfg=self.conv_cfg, | |
| norm_cfg=self.norm_cfg, | |
| act_cfg=dict(type=self.act[i + 1]), | |
| with_cp=self.with_cp) | |
| layer_index += 1 | |
| layer_name = f'layer{layer_index}' | |
| self.add_module(layer_name, layer) | |
| layers.append(layer_name) | |
| return layers | |
| def forward(self, x): | |
| x = self.conv1(x) | |
| for i, layer_name in enumerate(self.layers): | |
| layer = getattr(self, layer_name) | |
| x = layer(x) | |
| return (x, ) | |
| def _freeze_stages(self): | |
| if self.frozen_stages >= 0: | |
| for param in self.conv1.parameters(): | |
| param.requires_grad = False | |
| for i in range(1, self.frozen_stages + 1): | |
| layer = getattr(self, f'layer{i}') | |
| layer.eval() | |
| for param in layer.parameters(): | |
| param.requires_grad = False | |
| def train(self, mode=True): | |
| super().train(mode) | |
| self._freeze_stages() | |
| if mode and self.norm_eval: | |
| for m in self.modules(): | |
| if isinstance(m, _BatchNorm): | |
| m.eval() | |