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| import torch | |
| import torch.nn as nn | |
| from fastai.vision import * | |
| from modules.model import _default_tfmer_cfg | |
| from modules.resnet import resnet45 | |
| from modules.transformer import (PositionalEncoding, | |
| TransformerEncoder, | |
| TransformerEncoderLayer) | |
| class ResTranformer(nn.Module): | |
| def __init__(self, config): | |
| super().__init__() | |
| self.resnet = resnet45() | |
| self.d_model = ifnone(config.model_vision_d_model, _default_tfmer_cfg['d_model']) | |
| nhead = ifnone(config.model_vision_nhead, _default_tfmer_cfg['nhead']) | |
| d_inner = ifnone(config.model_vision_d_inner, _default_tfmer_cfg['d_inner']) | |
| dropout = ifnone(config.model_vision_dropout, _default_tfmer_cfg['dropout']) | |
| activation = ifnone(config.model_vision_activation, _default_tfmer_cfg['activation']) | |
| num_layers = ifnone(config.model_vision_backbone_ln, 2) | |
| self.pos_encoder = PositionalEncoding(self.d_model, max_len=8*32) | |
| encoder_layer = TransformerEncoderLayer(d_model=self.d_model, nhead=nhead, | |
| dim_feedforward=d_inner, dropout=dropout, activation=activation) | |
| self.transformer = TransformerEncoder(encoder_layer, num_layers) | |
| def forward(self, images): | |
| feature = self.resnet(images) | |
| n, c, h, w = feature.shape | |
| feature = feature.view(n, c, -1).permute(2, 0, 1) | |
| feature = self.pos_encoder(feature) | |
| feature = self.transformer(feature) | |
| feature = feature.permute(1, 2, 0).view(n, c, h, w) | |
| return feature | |