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import os
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import cv2
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import math
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import time
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import torch
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import torch.distributed as dist
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import numpy as np
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import random
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import argparse
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from model.RIFE import Model
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from dataset import *
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from torch.utils.data import DataLoader, Dataset
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from torch.utils.tensorboard import SummaryWriter
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from torch.utils.data.distributed import DistributedSampler
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device = torch.device("cuda")
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log_path = 'train_log'
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def get_learning_rate(step):
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if step < 2000:
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mul = step / 2000.
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return 3e-4 * mul
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else:
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mul = np.cos((step - 2000) / (args.epoch * args.step_per_epoch - 2000.) * math.pi) * 0.5 + 0.5
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return (3e-4 - 3e-6) * mul + 3e-6
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def flow2rgb(flow_map_np):
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h, w, _ = flow_map_np.shape
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rgb_map = np.ones((h, w, 3)).astype(np.float32)
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normalized_flow_map = flow_map_np / (np.abs(flow_map_np).max())
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rgb_map[:, :, 0] += normalized_flow_map[:, :, 0]
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rgb_map[:, :, 1] -= 0.5 * (normalized_flow_map[:, :, 0] + normalized_flow_map[:, :, 1])
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rgb_map[:, :, 2] += normalized_flow_map[:, :, 1]
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return rgb_map.clip(0, 1)
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def train(model, local_rank):
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if local_rank == 0:
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writer = SummaryWriter('train')
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writer_val = SummaryWriter('validate')
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else:
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writer = None
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writer_val = None
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step = 0
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nr_eval = 0
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dataset = VimeoDataset('train')
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sampler = DistributedSampler(dataset)
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train_data = DataLoader(dataset, batch_size=args.batch_size, num_workers=8, pin_memory=True, drop_last=True, sampler=sampler)
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args.step_per_epoch = train_data.__len__()
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dataset_val = VimeoDataset('validation')
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val_data = DataLoader(dataset_val, batch_size=16, pin_memory=True, num_workers=8)
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print('training...')
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time_stamp = time.time()
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for epoch in range(args.epoch):
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sampler.set_epoch(epoch)
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for i, data in enumerate(train_data):
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data_time_interval = time.time() - time_stamp
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time_stamp = time.time()
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data_gpu, timestep = data
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data_gpu = data_gpu.to(device, non_blocking=True) / 255.
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timestep = timestep.to(device, non_blocking=True)
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imgs = data_gpu[:, :6]
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gt = data_gpu[:, 6:9]
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learning_rate = get_learning_rate(step) * args.world_size / 4
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pred, info = model.update(imgs, gt, learning_rate, training=True)
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train_time_interval = time.time() - time_stamp
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time_stamp = time.time()
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if step % 200 == 1 and local_rank == 0:
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writer.add_scalar('learning_rate', learning_rate, step)
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writer.add_scalar('loss/l1', info['loss_l1'], step)
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writer.add_scalar('loss/tea', info['loss_tea'], step)
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writer.add_scalar('loss/distill', info['loss_distill'], step)
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if step % 1000 == 1 and local_rank == 0:
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gt = (gt.permute(0, 2, 3, 1).detach().cpu().numpy() * 255).astype('uint8')
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mask = (torch.cat((info['mask'], info['mask_tea']), 3).permute(0, 2, 3, 1).detach().cpu().numpy() * 255).astype('uint8')
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pred = (pred.permute(0, 2, 3, 1).detach().cpu().numpy() * 255).astype('uint8')
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merged_img = (info['merged_tea'].permute(0, 2, 3, 1).detach().cpu().numpy() * 255).astype('uint8')
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flow0 = info['flow'].permute(0, 2, 3, 1).detach().cpu().numpy()
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flow1 = info['flow_tea'].permute(0, 2, 3, 1).detach().cpu().numpy()
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for i in range(5):
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imgs = np.concatenate((merged_img[i], pred[i], gt[i]), 1)[:, :, ::-1]
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writer.add_image(str(i) + '/img', imgs, step, dataformats='HWC')
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writer.add_image(str(i) + '/flow', np.concatenate((flow2rgb(flow0[i]), flow2rgb(flow1[i])), 1), step, dataformats='HWC')
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writer.add_image(str(i) + '/mask', mask[i], step, dataformats='HWC')
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writer.flush()
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if local_rank == 0:
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print('epoch:{} {}/{} time:{:.2f}+{:.2f} loss_l1:{:.4e}'.format(epoch, i, args.step_per_epoch, data_time_interval, train_time_interval, info['loss_l1']))
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step += 1
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nr_eval += 1
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if nr_eval % 5 == 0:
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evaluate(model, val_data, step, local_rank, writer_val)
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model.save_model(log_path, local_rank)
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dist.barrier()
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def evaluate(model, val_data, nr_eval, local_rank, writer_val):
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loss_l1_list = []
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loss_distill_list = []
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loss_tea_list = []
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psnr_list = []
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psnr_list_teacher = []
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time_stamp = time.time()
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for i, data in enumerate(val_data):
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data_gpu, timestep = data
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data_gpu = data_gpu.to(device, non_blocking=True) / 255.
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imgs = data_gpu[:, :6]
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gt = data_gpu[:, 6:9]
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with torch.no_grad():
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pred, info = model.update(imgs, gt, training=False)
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merged_img = info['merged_tea']
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loss_l1_list.append(info['loss_l1'].cpu().numpy())
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loss_tea_list.append(info['loss_tea'].cpu().numpy())
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loss_distill_list.append(info['loss_distill'].cpu().numpy())
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for j in range(gt.shape[0]):
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psnr = -10 * math.log10(torch.mean((gt[j] - pred[j]) * (gt[j] - pred[j])).cpu().data)
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psnr_list.append(psnr)
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psnr = -10 * math.log10(torch.mean((merged_img[j] - gt[j]) * (merged_img[j] - gt[j])).cpu().data)
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psnr_list_teacher.append(psnr)
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gt = (gt.permute(0, 2, 3, 1).cpu().numpy() * 255).astype('uint8')
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pred = (pred.permute(0, 2, 3, 1).cpu().numpy() * 255).astype('uint8')
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merged_img = (merged_img.permute(0, 2, 3, 1).cpu().numpy() * 255).astype('uint8')
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flow0 = info['flow'].permute(0, 2, 3, 1).cpu().numpy()
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flow1 = info['flow_tea'].permute(0, 2, 3, 1).cpu().numpy()
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if i == 0 and local_rank == 0:
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for j in range(10):
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imgs = np.concatenate((merged_img[j], pred[j], gt[j]), 1)[:, :, ::-1]
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writer_val.add_image(str(j) + '/img', imgs.copy(), nr_eval, dataformats='HWC')
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writer_val.add_image(str(j) + '/flow', flow2rgb(flow0[j][:, :, ::-1]), nr_eval, dataformats='HWC')
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eval_time_interval = time.time() - time_stamp
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if local_rank != 0:
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return
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writer_val.add_scalar('psnr', np.array(psnr_list).mean(), nr_eval)
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writer_val.add_scalar('psnr_teacher', np.array(psnr_list_teacher).mean(), nr_eval)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument('--epoch', default=300, type=int)
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parser.add_argument('--batch_size', default=16, type=int, help='minibatch size')
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parser.add_argument('--local_rank', default=0, type=int, help='local rank')
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parser.add_argument('--world_size', default=4, type=int, help='world size')
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args = parser.parse_args()
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torch.distributed.init_process_group(backend="nccl", world_size=args.world_size)
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torch.cuda.set_device(args.local_rank)
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seed = 1234
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random.seed(seed)
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np.random.seed(seed)
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torch.manual_seed(seed)
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torch.cuda.manual_seed_all(seed)
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torch.backends.cudnn.benchmark = True
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model = Model(args.local_rank)
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train(model, args.local_rank)
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