from typing import Dict import numpy as np import torch import torch.nn as nn from navsim.agents.hydra.hydra_backbone_pe import HydraBackbonePE from navsim.agents.hydra.hydra_config import HydraConfig from navsim.agents.transfuser.transfuser_model import AgentHead from navsim.agents.utils.attn import MemoryEffTransformer from navsim.agents.utils.nerf import nerf_positional_encoding from navsim.agents.vadv2.vadv2_config import Vadv2Config class HydraModel(nn.Module): def __init__(self, config: HydraConfig): super().__init__() self._query_splits = [ config.num_bounding_boxes, ] self._config = config assert config.backbone_type in ['vit', 'intern', 'vov', 'resnet', 'eva', 'moe', 'moe_ult32', 'swin'] if config.backbone_type == 'eva': raise ValueError(f'{config.backbone_type} not supported') elif config.backbone_type == 'intern' or config.backbone_type == 'vov' or \ config.backbone_type == 'swin' or config.backbone_type == 'vit': self._backbone = HydraBackbonePE(config) img_num = 2 if config.use_back_view else 1 self._keyval_embedding = nn.Embedding( config.img_vert_anchors * config.img_horz_anchors * img_num, config.tf_d_model ) # 8x8 feature grid + trajectory self._query_embedding = nn.Embedding(sum(self._query_splits), config.tf_d_model) # usually, the BEV features are variable in size. self.downscale_layer = nn.Conv2d(self._backbone.img_feat_c, config.tf_d_model, kernel_size=1) self._status_encoding = nn.Linear((4 + 2 + 2) * config.num_ego_status, config.tf_d_model) tf_decoder_layer = nn.TransformerDecoderLayer( d_model=config.tf_d_model, nhead=config.tf_num_head, dim_feedforward=config.tf_d_ffn, dropout=config.tf_dropout, batch_first=True, ) self._tf_decoder = nn.TransformerDecoder(tf_decoder_layer, config.tf_num_layers) self._agent_head = AgentHead( num_agents=config.num_bounding_boxes, d_ffn=config.tf_d_ffn, d_model=config.tf_d_model, ) self._trajectory_head = HydraTrajHead( num_poses=config.trajectory_sampling.num_poses, d_ffn=config.tf_d_ffn, d_model=config.tf_d_model, nhead=config.vadv2_head_nhead, nlayers=config.vadv2_head_nlayers, vocab_path=config.vocab_path, config=config ) def img_feat_blc(self, camera_feature): img_features = self._backbone(camera_feature) img_features = self.downscale_layer(img_features).flatten(-2, -1) img_features = img_features.permute(0, 2, 1) return img_features def forward(self, features: Dict[str, torch.Tensor], interpolated_traj=None) -> Dict[str, torch.Tensor]: camera_feature: torch.Tensor = features["camera_feature"] status_feature: torch.Tensor = features["status_feature"] if isinstance(camera_feature, list): camera_feature = camera_feature[-1] # todo temp fix!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! # status_feature[:, 0] = 0.0 # status_feature[:, 1] = 1.0 # status_feature[:, 2] = 0.0 # status_feature[:, 3] = 0.0 batch_size = status_feature.shape[0] img_features = self.img_feat_blc(camera_feature) if self._config.use_back_view: img_features_back = self.img_feat_blc(features["camera_feature_back"]) img_features = torch.cat([img_features, img_features_back], 1) if self._config.num_ego_status == 1 and status_feature.shape[1] == 32: status_encoding = self._status_encoding(status_feature[:, :8]) else: status_encoding = self._status_encoding(status_feature) keyval = img_features keyval += self._keyval_embedding.weight[None, ...] query = self._query_embedding.weight[None, ...].repeat(batch_size, 1, 1) agents_query = self._tf_decoder(query, keyval) output: Dict[str, torch.Tensor] = {} trajectory = self._trajectory_head(keyval, status_encoding, interpolated_traj) output.update(trajectory) agents = self._agent_head(agents_query) output.update(agents) return output class HydraTrajHead(nn.Module): def __init__(self, num_poses: int, d_ffn: int, d_model: int, vocab_path: str, nhead: int, nlayers: int, config: Vadv2Config = None ): super().__init__() self._num_poses = num_poses self.transformer = nn.TransformerDecoder( nn.TransformerDecoderLayer( d_model, nhead, d_ffn, dropout=0.0, batch_first=True ), nlayers ) self.vocab = nn.Parameter( torch.from_numpy(np.load(vocab_path)), requires_grad=False ) self.heads = nn.ModuleDict({ 'noc': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ), 'da': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ), 'ttc': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ), 'comfort': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ), 'progress': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ), 'imi': nn.Sequential( nn.Linear(d_model, d_ffn), nn.ReLU(), nn.Linear(d_ffn, d_ffn), nn.ReLU(), nn.Linear(d_ffn, 1), ) }) self.inference_imi_weight = config.inference_imi_weight self.inference_da_weight = config.inference_da_weight self.normalize_vocab_pos = config.normalize_vocab_pos if self.normalize_vocab_pos: self.encoder = MemoryEffTransformer( d_model=d_model, nhead=nhead, dim_feedforward=d_model * 4, dropout=0.0 ) self.use_nerf = config.use_nerf if self.use_nerf: self.pos_embed = nn.Sequential( nn.Linear(1040, d_ffn), nn.ReLU(), nn.Linear(d_ffn, d_model), ) else: self.pos_embed = nn.Sequential( nn.Linear(num_poses * 3, d_ffn), nn.ReLU(), nn.Linear(d_ffn, d_model), ) def forward(self, bev_feature, status_encoding, interpolated_traj=None) -> Dict[str, torch.Tensor]: # todo sinusoidal embedding # vocab: 4096, 40, 3 # bev_feature: B, 32, C # embedded_vocab: B, 4096, C vocab = self.vocab.data L, HORIZON, _ = vocab.shape B = bev_feature.shape[0] if self.use_nerf: vocab = torch.cat( [ nerf_positional_encoding(vocab[..., :2]), torch.cos(vocab[..., -1])[..., None], torch.sin(vocab[..., -1])[..., None], ], dim=-1 ) if self.normalize_vocab_pos: embedded_vocab = self.pos_embed(vocab.view(L, -1))[None] embedded_vocab = self.encoder(embedded_vocab).repeat(B, 1, 1) else: embedded_vocab = self.pos_embed(vocab.view(L, -1))[None].repeat(B, 1, 1) tr_out = self.transformer(embedded_vocab, bev_feature) dist_status = tr_out + status_encoding.unsqueeze(1) result = {} # selected_indices: B, for k, head in self.heads.items(): if k == 'imi': result[k] = head(dist_status).squeeze(-1) else: result[k] = head(dist_status).squeeze(-1).sigmoid() scores = ( 0.05 * result['imi'].softmax(-1).log() + 0.5 * result['noc'].log() + 0.5 * result['da'].log() + 8.0 * (5 * result['ttc'] + 2 * result['comfort'] + 5 * result['progress']).log() ) selected_indices = scores.argmax(1) result["trajectory"] = self.vocab.data[selected_indices] result["trajectory_vocab"] = self.vocab.data result["selected_indices"] = selected_indices return result