Pretrain_nlvr.py

import argparse
import os
import ruamel_yaml as yaml
import numpy as np
import random
import time
import datetime
import json
from pathlib import Path

import torch
import torch.nn as nn
import torch.nn.functional as F
from torch.utils.data import DataLoader
import torch.backends.cudnn as cudnn
import torch.distributed as dist

from models.model_pretrain_nlvr import ALBEF
from models.vit import interpolate_pos_embed
from models.tokenization_bert import BertTokenizer

import utils
from dataset import create_dataset, create_sampler, create_loader
from scheduler import create_scheduler
from optim import create_optimizer


def train(model, data_loader, optimizer, tokenizer, epoch, warmup_steps, device, scheduler, config):
    # train
    model.train()  
    
    metric_logger = utils.MetricLogger(delimiter="  ")
    metric_logger.add_meter('lr', utils.SmoothedValue(window_size=50, fmt='{value:.6f}'))
    metric_logger.add_meter('loss', utils.SmoothedValue(window_size=50, fmt='{value:.4f}'))
    
    header = 'Train Epoch: [{}]'.format(epoch)
    print_freq = 50   
    step_size = 100
    warmup_iterations = warmup_steps*step_size  
    
    if args.distributed:
        data_loader.sampler.set_epoch(epoch)

    for i, (image, text) in enumerate(metric_logger.log_every(data_loader, print_freq, header)):
        
        optimizer.zero_grad()
  
        image = image.to(device,non_blocking=True) 
        text_input = tokenizer(text, padding='longest', truncation=True, max_length=25, return_tensors="pt").to(device)  

        loss = model(image, text_input)   
        loss.backward()

        optimizer.step()    
        
        metric_logger.update(loss=loss.item())
        metric_logger.update(lr=optimizer.param_groups[0]["lr"])
        
        if epoch==0 and i%step_size==0 and i<=warmup_iterations: 
            scheduler.step(i//step_size)         
        
    # gather the stats from all processes
    metric_logger.synchronize_between_processes()
    print("Averaged stats:", metric_logger.global_avg())     
    return {k: "{:.3f}".format(meter.global_avg) for k, meter in metric_logger.meters.items()}    
    
    
def main(args, config):
    utils.init_distributed_mode(args)    
    
    device = torch.device(args.device)

    # fix the seed for reproducibility
    seed = args.seed + utils.get_rank()
    torch.manual_seed(seed)
    np.random.seed(seed)
    random.seed(seed)
    cudnn.benchmark = True
    
    start_epoch = 0
    max_epoch = config['schedular']['epochs']
    warmup_steps = config['schedular']['warmup_epochs']    

    #### Dataset #### 
    print("Creating dataset")
    datasets = [create_dataset('pretrain', config)]
    
    if args.distributed:
        num_tasks = utils.get_world_size()
        global_rank = utils.get_rank()            
        samplers = create_sampler(datasets, [True], num_tasks, global_rank)         
    else:
        samplers = [None]

    data_loader = create_loader(datasets,samplers,batch_size=[config['batch_size']], num_workers=[4], is_trains=[True], collate_fns=[None])[0]

    tokenizer = BertTokenizer.from_pretrained(args.text_encoder)

    #### Model #### 
    print("Creating model")
    model = ALBEF(config=config, text_encoder=args.text_encoder, tokenizer=tokenizer)
    
    model = model.to(device)   
        
    arg_opt = utils.AttrDict(config['optimizer'])
    optimizer = create_optimizer(arg_opt, model)
    arg_sche = utils.AttrDict(config['schedular'])
    lr_scheduler, _ = create_scheduler(arg_sche, optimizer)      
    
    if args.checkpoint:    
        checkpoint = torch.load(args.checkpoint, map_location='cpu') 
        state_dict = checkpoint['model']
        pos_embed_reshaped = interpolate_pos_embed(state_dict['visual_encoder.pos_embed'],model.visual_encoder)         
        state_dict['visual_encoder.pos_embed'] = pos_embed_reshaped
            
        for key in list(state_dict.keys()):
            if 'bert' in key:
                new_key = key.replace('bert.','')

                if 'layer' in new_key:
                    keys = new_key.split('.')
                    layer_num = int(keys[3])
                    # replicate the multimodal encoder's blocks for two images
                    if layer_num>=6:
                        new_layer_num = (layer_num-6)*2+6
                        keys[3] = str(new_layer_num)
                        new_key_0 = '.'.join(keys)                       
                        state_dict[new_key_0] = state_dict[key] 
                        keys[3] = str(new_layer_num+1)
                        new_key_1 = '.'.join(keys)                       
                        state_dict[new_key_1] = state_dict[key]                         
                    else:
                        state_dict[new_key] = state_dict[key] 
                else:
                    state_dict[new_key] = state_dict[key] 
                del state_dict[key]

        msg = model.load_state_dict(state_dict,strict=False)
        print('load checkpoint from %s'%args.checkpoint)
        print(msg)
    
    model_without_ddp = model
    if args.distributed:
        model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.gpu], find_unused_parameters=True)
        model_without_ddp = model.module    
    
    print("Start training")
    start_time = time.time()

    for epoch in range(start_epoch, max_epoch):
        
        if epoch>0:
            lr_scheduler.step(epoch+warmup_steps)  
            
        train_stats = train(model, data_loader, optimizer, tokenizer, epoch, warmup_steps, device, lr_scheduler, config) 
        
        if utils.is_main_process():  
            log_stats = {**{f'train_{k}': v for k, v in train_stats.items()},
                         'epoch': epoch,
                        }                     
            save_obj = {
                'model': model_without_ddp.state_dict(),
                'optimizer': optimizer.state_dict(),
                'lr_scheduler': lr_scheduler.state_dict(),
                'config': config,
                'epoch': epoch,
            }
            torch.save(save_obj, os.path.join(args.output_dir, 'checkpoint_%02d.pth'%epoch))  
            
            with open(os.path.join(args.output_dir, "log.txt"),"a") as f:
                f.write(json.dumps(log_stats) + "\n")

        dist.barrier()   
                
    total_time = time.time() - start_time
    total_time_str = str(datetime.timedelta(seconds=int(total_time)))
    print('Training time {}'.format(total_time_str)) 
    
            

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--config', default='./configs/NLVR_pretrain.yaml')
    parser.add_argument('--checkpoint', default='') 
    parser.add_argument('--output_dir', default='output/NLVR_pretrain')
    parser.add_argument('--text_encoder', default='bert-base-uncased')
    parser.add_argument('--device', default='cuda')
    parser.add_argument('--seed', default=42, type=int)
    parser.add_argument('--world_size', default=1, type=int, help='number of distributed processes')    
    parser.add_argument('--dist_url', default='env://', help='url used to set up distributed training')
    parser.add_argument('--distributed', default=True, type=bool)
    args = parser.parse_args()

    config = yaml.load(open(args.config, 'r'), Loader=yaml.Loader)

    Path(args.output_dir).mkdir(parents=True, exist_ok=True)

    yaml.dump(config, open(os.path.join(args.output_dir, 'config.yaml'), 'w'))    
    
    main(args, config)