import os from typing import Union, Optional import numpy as np import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader from torch.utils.data.dataloader import default_collate from torch.utils.tensorboard import SummaryWriter from models.rgb_part_net import RGBPartNet from utils.configuration import DataloaderConfiguration, \ HyperparameterConfiguration, DatasetConfiguration, ModelConfiguration, \ SystemConfiguration from utils.dataset import CASIAB from utils.sampler import TripletSampler class Model: def __init__( self, system_config: SystemConfiguration, model_config: ModelConfiguration, hyperparameter_config: HyperparameterConfiguration ): self.disable_acc = system_config['disable_acc'] if self.disable_acc: self.device = torch.device('cpu') else: # Enable accelerator if torch.cuda.is_available(): self.device = torch.device('cuda') else: print('No accelerator available, fallback to CPU.') self.device = torch.device('cpu') self.save_dir = system_config['save_dir'] self.checkpoint_dir = os.path.join(self.save_dir, 'checkpoint') self.log_dir = os.path.join(self.save_dir, 'logs') for dir_ in (self.save_dir, self.log_dir, self.checkpoint_dir): if not os.path.exists(dir_): os.mkdir(dir_) self.meta = model_config self.hp = hyperparameter_config self.curr_iter = self.meta['restore_iter'] self.total_iter = self.meta['total_iter'] self.is_train: bool = True self.train_size: int = 74 self.in_channels: int = 3 self.pr: Optional[int] = None self.k: Optional[int] = None self._model_sig: str = self._make_signature(self.meta, ['restore_iter']) self._hp_sig: str = self._make_signature(self.hp) self._dataset_sig: str = 'undefined' self._log_sig: str = '_'.join((self._model_sig, self._hp_sig)) self.log_name: str = os.path.join(self.log_dir, self._log_sig) self.rgb_pn: Optional[RGBPartNet] = None self.optimizer: Optional[optim.Adam] = None self.scheduler: Optional[optim.lr_scheduler.StepLR] = None self.writer: Optional[SummaryWriter] = None @property def signature(self) -> str: return '_'.join((self._model_sig, str(self.curr_iter), self._hp_sig, self._dataset_sig, str(self.pr), str(self.k))) @property def checkpoint_name(self) -> str: return os.path.join(self.checkpoint_dir, self.signature) def fit( self, dataset_config: DatasetConfiguration, dataloader_config: DataloaderConfiguration, ): self.is_train = True dataset = self._parse_dataset_config(dataset_config) dataloader = self._parse_dataloader_config(dataset, dataloader_config) # Prepare for model, optimizer and scheduler hp = self.hp.copy() lr, betas = hp.pop('lr', 1e-4), hp.pop('betas', (0.9, 0.999)) self.rgb_pn = RGBPartNet(self.train_size, self.in_channels, **hp) self.optimizer = optim.Adam(self.rgb_pn.parameters(), lr, betas) self.scheduler = optim.lr_scheduler.StepLR(self.optimizer, 500, 0.9) self.writer = SummaryWriter(self.log_name) if not self.disable_acc: if torch.cuda.device_count() > 1: self.rgb_pn = nn.DataParallel(self.rgb_pn) self.rgb_pn = self.rgb_pn.to(self.device) self.rgb_pn.train() # Init weights at first iter if self.curr_iter == 0: self.rgb_pn.apply(self.init_weights) else: # Load saved state dicts checkpoint = torch.load(self.checkpoint_name) iter_, loss = checkpoint['iter'], checkpoint['loss'] print('{0:5d} loss: {1:.3f}'.format(iter_, loss)) self.rgb_pn.load_state_dict(checkpoint['model_state_dict']) self.optimizer.load_state_dict(checkpoint['optim_state_dict']) for (batch_c1, batch_c2) in dataloader: self.curr_iter += 1 # Zero the parameter gradients self.optimizer.zero_grad() # forward + backward + optimize x_c1 = batch_c1['clip'].to(self.device) x_c2 = batch_c2['clip'].to(self.device) y = batch_c1['label'].to(self.device) loss, metrics = self.rgb_pn(x_c1, x_c2, y) loss.backward() self.optimizer.step() # Step scheduler self.scheduler.step() # Write losses to TensorBoard self.writer.add_scalar('Loss/all', loss.item(), self.curr_iter) self.writer.add_scalars('Loss/details', dict(zip([ 'Cross reconstruction loss', 'Pose similarity loss', 'Canonical consistency loss', 'Batch All triplet loss' ], metrics)), self.curr_iter) if self.curr_iter % 100 == 0: print('{0:5d} loss: {1:.3f}'.format(self.curr_iter, loss), '(xrecon = {:f}, pose_sim = {:f},' ' cano_cons = {:f}, ba_trip = {:f})'.format(*metrics), 'lr:', self.scheduler.get_last_lr()[0]) if self.curr_iter % 1000 == 0: torch.save({ 'iter': self.curr_iter, 'model_state_dict': self.rgb_pn.state_dict(), 'optim_state_dict': self.optimizer.state_dict(), 'loss': loss, }, self.checkpoint_name) if self.curr_iter == self.total_iter: self.writer.close() break @staticmethod def init_weights(m): if isinstance(m, nn.modules.conv._ConvNd): nn.init.normal_(m.weight, 0.0, 0.01) elif isinstance(m, nn.modules.batchnorm._NormBase): nn.init.normal_(m.weight, 1.0, 0.01) nn.init.zeros_(m.bias) elif isinstance(m, nn.Linear): nn.init.xavier_uniform_(m.weight) elif isinstance(m, RGBPartNet): nn.init.xavier_uniform_(m.fc_mat) def _parse_dataset_config( self, dataset_config: DatasetConfiguration ) -> Union[CASIAB]: self.train_size = dataset_config.get('train_size', 74) self.in_channels = dataset_config.get('num_input_channels', 3) self._dataset_sig = self._make_signature( dataset_config, popped_keys=['root_dir', 'cache_on'] ) self.log_name = '_'.join((self.log_name, self._dataset_sig)) config: dict = dataset_config.copy() name = config.pop('name') if name == 'CASIA-B': return CASIAB(**config, is_train=self.is_train) elif name == 'FVG': # TODO pass raise ValueError('Invalid dataset: {0}'.format(name)) def _parse_dataloader_config( self, dataset: Union[CASIAB], dataloader_config: DataloaderConfiguration ) -> DataLoader: config: dict = dataloader_config.copy() if self.is_train: (self.pr, self.k) = config.pop('batch_size') self.log_name = '_'.join((self.log_name, str(self.pr), str(self.k))) triplet_sampler = TripletSampler(dataset, (self.pr, self.k)) return DataLoader(dataset, batch_sampler=triplet_sampler, collate_fn=self._batch_splitter, **config) else: # is_test config.pop('batch_size') return DataLoader(dataset, **config) def _batch_splitter( self, batch: list[dict[str, Union[np.int64, str, torch.Tensor]]] ) -> tuple[dict[str, Union[list[str], torch.Tensor]], dict[str, Union[list[str], torch.Tensor]]]: """ Disentanglement need two random conditions, this function will split pr * k * 2 samples to 2 dicts each containing pr * k samples. labels and clip data are tensor, and others are list. """ _batch = [[], []] for i in range(0, self.pr * self.k * 2, self.k * 2): _batch[0] += batch[i:i + self.k] _batch[1] += batch[i + self.k:i + self.k * 2] return default_collate(_batch[0]), default_collate(_batch[1]) def _make_signature(self, config: dict, popped_keys: Optional[list] = None) -> str: _config = config.copy() if popped_keys: for key in popped_keys: _config.pop(key) return self._gen_sig(list(_config.values())) def _gen_sig(self, values: Union[tuple, list, set, str, int, float]) -> str: strings = [] for v in values: if isinstance(v, str): strings.append(v) elif isinstance(v, (tuple, list, set)): strings.append(self._gen_sig(v)) elif isinstance(v, dict): strings.append(self._gen_sig(list(v.values()))) else: strings.append(str(v)) return '_'.join(strings)