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| # ------------------------------------------------------------------------ | |
| # RF-DETR | |
| # Copyright (c) 2025 Roboflow. All Rights Reserved. | |
| # Licensed under the Apache License, Version 2.0 [see LICENSE for details] | |
| # ------------------------------------------------------------------------ | |
| # Modified from LW-DETR (https://github.com/Atten4Vis/LW-DETR) | |
| # Copyright (c) 2024 Baidu. All Rights Reserved. | |
| # ------------------------------------------------------------------------ | |
| # Modified from Conditional DETR (https://github.com/Atten4Vis/ConditionalDETR) | |
| # Copyright (c) 2021 Microsoft. All Rights Reserved. | |
| # ------------------------------------------------------------------------ | |
| # Copied from DETR (https://github.com/facebookresearch/detr) | |
| # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | |
| # ------------------------------------------------------------------------ | |
| """ | |
| Various positional encodings for the transformer. | |
| """ | |
| import math | |
| import torch | |
| from torch import nn | |
| from rfdetr.util.misc import NestedTensor | |
| class PositionEmbeddingSine(nn.Module): | |
| """ | |
| This is a more standard version of the position embedding, very similar to the one | |
| used by the Attention is all you need paper, generalized to work on images. | |
| """ | |
| def __init__(self, num_pos_feats=64, temperature=10000, normalize=False, scale=None): | |
| super().__init__() | |
| self.num_pos_feats = num_pos_feats | |
| self.temperature = temperature | |
| self.normalize = normalize | |
| if scale is not None and normalize is False: | |
| raise ValueError("normalize should be True if scale is passed") | |
| if scale is None: | |
| scale = 2 * math.pi | |
| self.scale = scale | |
| self._export = False | |
| def export(self): | |
| self._export = True | |
| self._forward_origin = self.forward | |
| self.forward = self.forward_export | |
| def forward(self, tensor_list: NestedTensor, align_dim_orders = True): | |
| x = tensor_list.tensors | |
| mask = tensor_list.mask | |
| assert mask is not None | |
| not_mask = ~mask | |
| y_embed = not_mask.cumsum(1, dtype=torch.float32) | |
| x_embed = not_mask.cumsum(2, dtype=torch.float32) | |
| if self.normalize: | |
| eps = 1e-6 | |
| y_embed = y_embed / (y_embed[:, -1:, :] + eps) * self.scale | |
| x_embed = x_embed / (x_embed[:, :, -1:] + eps) * self.scale | |
| dim_t = torch.arange(self.num_pos_feats, dtype=torch.float32, device=x.device) | |
| dim_t = self.temperature ** (2 * (dim_t // 2) / self.num_pos_feats) | |
| pos_x = x_embed[:, :, :, None] / dim_t | |
| pos_y = y_embed[:, :, :, None] / dim_t | |
| pos_x = torch.stack((pos_x[:, :, :, 0::2].sin(), pos_x[:, :, :, 1::2].cos()), dim=4).flatten(3) | |
| pos_y = torch.stack((pos_y[:, :, :, 0::2].sin(), pos_y[:, :, :, 1::2].cos()), dim=4).flatten(3) | |
| if align_dim_orders: | |
| pos = torch.cat((pos_y, pos_x), dim=3).permute(1, 2, 0, 3) | |
| # return: (H, W, bs, C) | |
| else: | |
| pos = torch.cat((pos_y, pos_x), dim=3).permute(0, 3, 1, 2) | |
| # return: (bs, C, H, W) | |
| return pos | |
| def forward_export(self, mask:torch.Tensor, align_dim_orders = True): | |
| assert mask is not None | |
| not_mask = ~mask | |
| y_embed = not_mask.cumsum(1, dtype=torch.float32) | |
| x_embed = not_mask.cumsum(2, dtype=torch.float32) | |
| if self.normalize: | |
| eps = 1e-6 | |
| y_embed = y_embed / (y_embed[:, -1:, :] + eps) * self.scale | |
| x_embed = x_embed / (x_embed[:, :, -1:] + eps) * self.scale | |
| dim_t = torch.arange(self.num_pos_feats, dtype=torch.float32, device=mask.device) | |
| dim_t = self.temperature ** (2 * (dim_t // 2) / self.num_pos_feats) | |
| pos_x = x_embed[:, :, :, None] / dim_t | |
| pos_y = y_embed[:, :, :, None] / dim_t | |
| pos_x = torch.stack((pos_x[:, :, :, 0::2].sin(), pos_x[:, :, :, 1::2].cos()), dim=4).flatten(3) | |
| pos_y = torch.stack((pos_y[:, :, :, 0::2].sin(), pos_y[:, :, :, 1::2].cos()), dim=4).flatten(3) | |
| if align_dim_orders: | |
| pos = torch.cat((pos_y, pos_x), dim=3).permute(1, 2, 0, 3) | |
| # return: (H, W, bs, C) | |
| else: | |
| pos = torch.cat((pos_y, pos_x), dim=3).permute(0, 3, 1, 2) | |
| # return: (bs, C, H, W) | |
| return pos | |
| class PositionEmbeddingLearned(nn.Module): | |
| """ | |
| Absolute pos embedding, learned. | |
| """ | |
| def __init__(self, num_pos_feats=256): | |
| super().__init__() | |
| self.row_embed = nn.Embedding(50, num_pos_feats) | |
| self.col_embed = nn.Embedding(50, num_pos_feats) | |
| self.reset_parameters() | |
| self._export = False | |
| def export(self): | |
| raise NotImplementedError | |
| def reset_parameters(self): | |
| nn.init.uniform_(self.row_embed.weight) | |
| nn.init.uniform_(self.col_embed.weight) | |
| def forward(self, tensor_list: NestedTensor): | |
| x = tensor_list.tensors | |
| h, w = x.shape[:2] | |
| i = torch.arange(w, device=x.device) | |
| j = torch.arange(h, device=x.device) | |
| x_emb = self.col_embed(i) | |
| y_emb = self.row_embed(j) | |
| pos = torch.cat([ | |
| x_emb.unsqueeze(0).repeat(h, 1, 1), | |
| y_emb.unsqueeze(1).repeat(1, w, 1), | |
| ], dim=-1).unsqueeze(2).repeat(1, 1, x.shape[2], 1) | |
| # return: (H, W, bs, C) | |
| return pos | |
| def build_position_encoding(hidden_dim, position_embedding): | |
| N_steps = hidden_dim // 2 | |
| if position_embedding in ('v2', 'sine'): | |
| # TODO find a better way of exposing other arguments | |
| position_embedding = PositionEmbeddingSine(N_steps, normalize=True) | |
| elif position_embedding in ('v3', 'learned'): | |
| position_embedding = PositionEmbeddingLearned(N_steps) | |
| else: | |
| raise ValueError(f"not supported {position_embedding}") | |
| return position_embedding | |