diff options
Diffstat (limited to 'simclr')
| -rw-r--r-- | simclr/main.py | 350 | ||||
| -rw-r--r-- | simclr/models.py | 36 |
2 files changed, 386 insertions, 0 deletions
diff --git a/simclr/main.py b/simclr/main.py new file mode 100644 index 0000000..0252e3a --- /dev/null +++ b/simclr/main.py @@ -0,0 +1,350 @@ +import argparse +import os +import sys +from dataclasses import dataclass +from pathlib import Path +from typing import Iterable, Callable + +import torch +import yaml +from torch.utils.data import Dataset +from torchvision.datasets import CIFAR10, CIFAR100, ImageNet +from torchvision.transforms import transforms + +from libs.criteria import InfoNCELoss + +path = str(Path(Path(__file__).parent.absolute()).parent.absolute()) +sys.path.insert(0, path) + +from libs.datautils import color_distortion, Clip, RandomGaussianBlur, TwinTransform +from libs.optimizers import LARS +from libs.schedulers import LinearWarmupAndCosineAnneal, LinearLR +from libs.utils import Trainer, BaseConfig +from libs.logging import BaseBatchLogRecord, Loggers +from simclr.models import CIFARSimCLRResNet50, ImageNetSimCLRResNet50 + + +def parse_args_and_config(): + parser = argparse.ArgumentParser( + description='Contrastive baseline SimCLR', + formatter_class=argparse.ArgumentDefaultsHelpFormatter + ) + parser.add_argument('--codename', default='cifar10-simclr-128-lars-warmup', + type=str, help="Model descriptor") + parser.add_argument('--log-dir', default='logs', type=str, + help="Path to log directory") + parser.add_argument('--checkpoint-dir', default='checkpoints', type=str, + help="Path to checkpoints directory") + parser.add_argument('--seed', default=None, type=int, + help='Random seed for reproducibility') + parser.add_argument('--num-iters', default=23438, type=int, + help='Number of iters') + parser.add_argument('--config', type=argparse.FileType(mode='r'), + help='Path to config file (optional)') + + # TODO: Add model hyperparams dataclass + parser.add_argument('--out-dim', default=256, type=int, + help='Number of dimension of embedding') + parser.add_argument('--temp', default=0.01, type=float, + help='Temperature in InfoNCE loss') + + dataset_group = parser.add_argument_group('Dataset parameters') + dataset_group.add_argument('--dataset-dir', default='dataset', type=str, + help="Path to dataset directory") + dataset_group.add_argument('--dataset', default='cifar10', type=str, + choices=('cifar10, cifar100', 'imagenet'), + help="Name of dataset") + dataset_group.add_argument('--crop-size', default=32, type=int, + help='Random crop size after resize') + dataset_group.add_argument('--crop-scale-range', nargs=2, default=(0.8, 1), + type=float, help='Random resize scale range', + metavar=('start', 'stop')) + dataset_group.add_argument('--hflip-prob', default=0.5, type=float, + help='Random horizontal flip probability') + dataset_group.add_argument('--distort-strength', default=0.5, type=float, + help='Distortion strength') + dataset_group.add_argument('--gauss-ker-scale', default=10, type=float, + help='Gaussian kernel scale factor ' + '(s = img_size / ker_size)') + dataset_group.add_argument('--gauss-sigma-range', nargs=2, default=(0.1, 2), + type=float, help='Random gaussian blur sigma range', + metavar=('start', 'stop')) + dataset_group.add_argument('--gauss-prob', default=0.5, type=float, + help='Random gaussian blur probability') + + dataloader_group = parser.add_argument_group('Dataloader parameters') + dataloader_group.add_argument('--batch-size', default=128, type=int, + help='Batch size') + dataloader_group.add_argument('--num-workers', default=2, type=int, + help='Number of dataloader processes') + + optim_group = parser.add_argument_group('Optimizer parameters') + optim_group.add_argument('--optim', default='lars', type=str, + choices=('adam', 'sgd', 'lars'), + help="Name of optimizer") + optim_group.add_argument('--lr', default=1., type=float, + help='Learning rate') + optim_group.add_argument('--betas', nargs=2, default=(0.9, 0.999), type=float, + help='Adam betas', metavar=('beta1', 'beta2')) + optim_group.add_argument('--momentum', default=0.9, type=float, + help='SDG momentum') + optim_group.add_argument('--weight-decay', default=1e-6, type=float, + help='Weight decay (l2 regularization)') + + sched_group = parser.add_argument_group('Optimizer parameters') + sched_group.add_argument('--sched', default='warmup-anneal', type=str, + help="Name of scheduler") + sched_group.add_argument('--warmup-iters', default=2344, type=int, + help='Epochs for warmup (`warmup-anneal` scheduler only)') + + args = parser.parse_args() + if args.config: + config = yaml.safe_load(args.config) + args.__dict__ |= { + k: tuple(v) if isinstance(v, list) else v + for k, v in config.items() + } + args.checkpoint_dir = os.path.join(args.checkpoint_dir, args.codename) + args.log_dir = os.path.join(args.log_dir, args.codename) + + return args + + +@dataclass +class SimCLRConfig(BaseConfig): + @dataclass + class DatasetConfig(BaseConfig.DatasetConfig): + dataset_dir: str + crop_size: int + crop_scale_range: tuple[float, float] + hflip_prob: float + distort_strength: float + gauss_ker_scale: float + gauss_sigma_range: tuple[float, float] + gauss_prob: float + + @dataclass + class OptimConfig(BaseConfig.OptimConfig): + momentum: float + betas: tuple[float, float] + weight_decay: float + + @dataclass + class SchedConfig(BaseConfig.SchedConfig): + sched: str | None + warmup_iters: int + + +class SimCLRTrainer(Trainer): + def __init__(self, out_dim, **kwargs): + self.out_dim = out_dim + super(SimCLRTrainer, self).__init__(**kwargs) + + @dataclass + class BatchLogRecord(BaseBatchLogRecord): + lr: float | None + train_loss: float | None + train_accuracy: float | None + eval_loss: float | None + eval_accuracy: float | None + + @staticmethod + def _prepare_dataset(dataset_config: SimCLRConfig.DatasetConfig) -> tuple[Dataset, Dataset]: + basic_augmentation = transforms.Compose([ + transforms.RandomResizedCrop( + dataset_config.crop_size, + scale=dataset_config.crop_scale_range, + interpolation=transforms.InterpolationMode.BICUBIC + ), + transforms.RandomHorizontalFlip(dataset_config.hflip_prob), + color_distortion(dataset_config.distort_strength), + ]) + if dataset_config.dataset in {'cifar10', 'cifar100', 'cifar'}: + transform = transforms.Compose([ + basic_augmentation, + transforms.ToTensor(), + Clip(), + ]) + if dataset_config.dataset in {'cifar10', 'cifar'}: + train_set = CIFAR10(dataset_config.dataset_dir, train=True, + transform=TwinTransform(transform), + download=True) + test_set = CIFAR10(dataset_config.dataset_dir, train=False, + transform=TwinTransform(transform)) + else: # CIFAR-100 + train_set = CIFAR100(dataset_config.dataset_dir, train=True, + transform=TwinTransform(transform), + download=True) + test_set = CIFAR100(dataset_config.dataset_dir, train=False, + transform=TwinTransform(transform)) + elif dataset_config.dataset in {'imagenet1k', 'imagenet'}: + random_gaussian_blur = RandomGaussianBlur( + kernel_size=dataset_config.crop_size // dataset_config.gauss_ker_scale, + sigma_range=dataset_config.gauss_sigma_range, + p=dataset_config.gauss_prob + ), + transform = transforms.Compose([ + basic_augmentation, + random_gaussian_blur, + transforms.ToTensor(), + Clip() + ]) + train_set = ImageNet(dataset_config.dataset_dir, 'train', + transform=TwinTransform(transform)) + test_set = ImageNet(dataset_config.dataset_dir, 'val', + transform=TwinTransform(transform)) + else: + raise NotImplementedError(f"Unimplemented dataset: '{dataset_config.dataset}") + + return train_set, test_set + + def _init_models(self, dataset: str) -> Iterable[tuple[str, torch.nn.Module]]: + if dataset in {'cifar10', 'cifar100', 'cifar'}: + model = CIFARSimCLRResNet50(self.out_dim) + elif dataset in {'imagenet1k', 'imagenet'}: + model = ImageNetSimCLRResNet50(self.out_dim) + else: + raise NotImplementedError(f"Unimplemented dataset: '{dataset}") + + yield 'model', model + + @staticmethod + def _configure_optimizers( + models: Iterable[tuple[str, torch.nn.Module]], + optim_config: SimCLRConfig.OptimConfig, + ) -> Iterable[tuple[str, torch.optim.Optimizer]]: + def exclude_from_wd_and_adaptation(name): + if 'bn' in name: + return True + if optim_config.optim == 'lars' and 'bias' in name: + return True + + for model_name, model in models: + param_groups = [ + { + 'params': [p for name, p in model.named_parameters() + if not exclude_from_wd_and_adaptation(name)], + 'weight_decay': optim_config.weight_decay, + 'layer_adaptation': True, + }, + { + 'params': [p for name, p in model.named_parameters() + if exclude_from_wd_and_adaptation(name)], + 'weight_decay': 0., + 'layer_adaptation': False, + }, + ] + if optim_config.optim == 'adam': + optimizer = torch.optim.Adam( + param_groups, + lr=optim_config.lr, + betas=optim_config.betas, + ) + elif optim_config.optim in {'sdg', 'lars'}: + optimizer = torch.optim.SGD( + param_groups, + lr=optim_config.lr, + momentum=optim_config.momentum, + ) + else: + raise NotImplementedError(f"Unimplemented optimizer: '{optim_config.optim}'") + + yield f"{model_name}_optim", optimizer + + @staticmethod + def _configure_scheduler( + optims: Iterable[tuple[str, torch.optim.Optimizer]], + last_iter: int, + num_iters: int, + sched_config: SimCLRConfig.SchedConfig, + ) -> Iterable[tuple[str, torch.optim.lr_scheduler._LRScheduler] + | tuple[str, None]]: + for optim_name, optim in optims: + if sched_config.sched == 'warmup-anneal': + scheduler = LinearWarmupAndCosineAnneal( + optim, + warm_up=sched_config.warmup_iters / num_iters, + T_max=num_iters, + last_epoch=last_iter, + ) + elif sched_config.sched == 'linear': + scheduler = LinearLR( + optim, + num_epochs=num_iters, + last_epoch=last_iter + ) + elif sched_config.sched in {None, '', 'const'}: + scheduler = None + else: + raise NotImplementedError(f"Unimplemented scheduler: '{sched_config.sched}'") + + yield f"{optim_name}_sched", scheduler + + def _custom_init_fn(self, config: SimCLRConfig): + self.optims = {n: LARS(o) if config.optim_config.optim == 'lars' else o + for n, o in self.optims.items()} + + def train(self, num_iters: int, loss_fn: Callable, logger: Loggers, device: torch.device): + model = self.models['model'] + optim = self.optims['model_optim'] + sched = self.scheds['model_optim_sched'] + train_loader = iter(self.train_loader) + model.train() + for iter_ in range(self.restore_iter, num_iters): + (input1, input2), _ = next(train_loader) + input1, input2 = input1.to(device), input2.to(device) + model.zero_grad() + output1 = model(input1) + output2 = model(input2) + train_loss, train_accuracy = loss_fn(output1, output2) + train_loss.backward() + optim.step() + self.log(logger, self.BatchLogRecord( + iter_, num_iters, iter_, iter_, num_iters, + optim.param_groups[0]['lr'], + train_loss.item(), train_accuracy.item(), + eval_loss=None, eval_accuracy=None, + )) + if (iter_ + 1) % (num_iters // 100) == 0: + metrics = torch.Tensor(list(self.eval(loss_fn, device))).mean(0) + eval_loss = metrics[0].item() + eval_accuracy = metrics[1].item() + eval_log = self.BatchLogRecord( + iter_, num_iters, iter_, iter_, num_iters, + lr=None, train_loss=None, train_accuracy=None, + eval_loss=eval_loss, eval_accuracy=eval_accuracy, + ) + self.log(logger, eval_log) + self.save_checkpoint(eval_log) + model.train() + if sched is not None: + sched.step() + + def eval(self, loss_fn: Callable, device: torch.device): + model = self.models['model'] + model.eval() + with torch.no_grad(): + for (input1, input2), _ in self.test_loader: + input1, input2 = input1.to(device), input2.to(device) + output1 = model(input1) + output2 = model(input2) + loss, accuracy = loss_fn(output1, output2) + yield loss.item(), accuracy.item() + + +if __name__ == '__main__': + args = parse_args_and_config() + config = SimCLRConfig.from_args(args) + device = torch.device('cuda') if torch.cuda.is_available() else torch.device('cpu') + trainer = SimCLRTrainer( + seed=args.seed, + checkpoint_dir=args.checkpoint_dir, + device=device, + inf_mode=True, + num_iters=args.num_iters, + config=config, + out_dim=args.out_dim, + ) + + loggers = trainer.init_logger(args.log_dir) + trainer.train(args.num_iters, InfoNCELoss(args.temp), loggers, device) diff --git a/simclr/models.py b/simclr/models.py new file mode 100644 index 0000000..216a993 --- /dev/null +++ b/simclr/models.py @@ -0,0 +1,36 @@ +import torch +from torch import nn, Tensor +from torchvision.models import ResNet +from torchvision.models.resnet import BasicBlock + + +class CIFARSimCLRResNet50(ResNet): + def __init__(self, out_dim): + super(CIFARSimCLRResNet50, self).__init__( + block=BasicBlock, layers=[3, 4, 6, 3], num_classes=out_dim + ) + self.conv1 = nn.Conv2d(3, 64, kernel_size=3, + stride=1, padding=1, bias=False) + + def forward(self, x: Tensor) -> Tensor: + x = self.conv1(x) + x = self.bn1(x) + x = self.relu(x) + + x = self.layer1(x) + x = self.layer2(x) + x = self.layer3(x) + x = self.layer4(x) + + x = self.avgpool(x) + x = torch.flatten(x, 1) + x = self.fc(x) + + return x + + +class ImageNetSimCLRResNet50(ResNet): + def __init__(self, out_dim): + super(ImageNetSimCLRResNet50, self).__init__( + block=BasicBlock, layers=[3, 4, 6, 3], num_classes=out_dim + ) |