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| from models.siamrpn import SiamRPN | |
| from models.features import MultiStageFeature | |
| from models.rpn import RPN, DepthCorr | |
| import torch.nn as nn | |
| from utils.load_helper import load_pretrain | |
| from resnet import resnet50 | |
| class ResDownS(nn.Module): | |
| def __init__(self, inplane, outplane): | |
| super(ResDownS, self).__init__() | |
| self.downsample = nn.Sequential( | |
| nn.Conv2d(inplane, outplane, kernel_size=1, bias=False), | |
| nn.BatchNorm2d(outplane)) | |
| def forward(self, x): | |
| x = self.downsample(x) | |
| if x.size(3) < 20: | |
| l = 4 | |
| r = -4 | |
| x = x[:, :, l:r, l:r] | |
| return x | |
| class ResDown(MultiStageFeature): | |
| def __init__(self, pretrain=False): | |
| super(ResDown, self).__init__() | |
| self.features = resnet50(layer3=True, layer4=False) | |
| if pretrain: | |
| load_pretrain(self.features, 'resnet.model') | |
| self.downsample = ResDownS(1024, 256) | |
| self.layers = [self.downsample, self.features.layer2, self.features.layer3] | |
| self.train_nums = [1, 3] | |
| self.change_point = [0, 0.5] | |
| self.unfix(0.0) | |
| def param_groups(self, start_lr, feature_mult=1): | |
| lr = start_lr * feature_mult | |
| def _params(module, mult=1): | |
| params = list(filter(lambda x:x.requires_grad, module.parameters())) | |
| if len(params): | |
| return [{'params': params, 'lr': lr * mult}] | |
| else: | |
| return [] | |
| groups = [] | |
| groups += _params(self.downsample) | |
| groups += _params(self.features, 0.1) | |
| return groups | |
| def forward(self, x): | |
| output = self.features(x) | |
| p2, p3, p4 = output | |
| p3 = self.downsample(p3) | |
| return p3 | |
| class UP(RPN): | |
| def __init__(self, anchor_num=5, feature_in=256, feature_out=256): | |
| super(UP, self).__init__() | |
| self.anchor_num = anchor_num | |
| self.feature_in = feature_in | |
| self.feature_out = feature_out | |
| self.cls_output = 2 * self.anchor_num | |
| self.loc_output = 4 * self.anchor_num | |
| self.cls = DepthCorr(feature_in, feature_out, self.cls_output) | |
| self.loc = DepthCorr(feature_in, feature_out, self.loc_output) | |
| def forward(self, z_f, x_f): | |
| cls = self.cls(z_f, x_f) | |
| loc = self.loc(z_f, x_f) | |
| return cls, loc | |
| class Custom(SiamRPN): | |
| def __init__(self, pretrain=False, **kwargs): | |
| super(Custom, self).__init__(**kwargs) | |
| self.features = ResDown(pretrain=pretrain) | |
| self.rpn_model = UP(anchor_num=self.anchor_num, feature_in=256, feature_out=256) | |
| def template(self, template): | |
| self.zf = self.features(template) | |
| def track(self, search): | |
| search = self.features(search) | |
| rpn_pred_cls, rpn_pred_loc = self.rpn(self.zf, search) | |
| return rpn_pred_cls, rpn_pred_loc | |