import numpy as np
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import torch
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import torch.nn as nn
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from torch.autograd import Variable
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from torch.utils.data import DataLoader
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from torchvision import transforms
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import torchvision
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import torch.backends.cudnn as cudnn
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import torch.nn.functional as F
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import cv2
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import matplotlib.pyplot as plt
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import sys
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import os
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import argparse
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import datasets
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import hopenet
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import torch.utils.model_zoo as model_zoo
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model_urls = {
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'resnet18': 'https://download.pytorch.org/models/resnet18-5c106cde.pth',
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'resnet34': 'https://download.pytorch.org/models/resnet34-333f7ec4.pth',
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'resnet50': 'https://download.pytorch.org/models/resnet50-19c8e357.pth',
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'resnet101': 'https://download.pytorch.org/models/resnet101-5d3b4d8f.pth',
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'resnet152': 'https://download.pytorch.org/models/resnet152-b121ed2d.pth',
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}
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def parse_args():
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"""Parse input arguments."""
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parser = argparse.ArgumentParser(description='Head pose estimation using the Hopenet network.')
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parser.add_argument('--gpu', dest='gpu_id', help='GPU device id to use [0]',
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default=0, type=int)
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parser.add_argument('--num_epochs_ft', dest='num_epochs_ft', help='Maximum number of finetuning epochs.',
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default=5, type=int)
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parser.add_argument('--batch_size', dest='batch_size', help='Batch size.',
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default=16, type=int)
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parser.add_argument('--lr', dest='lr', help='Base learning rate.',
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default=0.001, type=float)
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parser.add_argument('--data_dir', dest='data_dir', help='Directory path for data.',
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default='', type=str)
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parser.add_argument('--filename_list', dest='filename_list', help='Path to text file containing relative paths for every example.',
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default='', type=str)
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parser.add_argument('--output_string', dest='output_string', help='String appended to output snapshots.', default = '', type=str)
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parser.add_argument('--alpha', dest='alpha', help='Regression loss coefficient.',
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default=0.001, type=float)
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parser.add_argument('--iter_ref', dest='iter_ref', help='Number of iterative refinement passes.',
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default=1, type=int)
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parser.add_argument('--dataset', dest='dataset', help='Dataset type.', default='Pose_300W_LP', type=str)
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parser.add_argument('--snapshot', dest='snapshot', help='Snapshot to start finetuning', default='', type=str)
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args = parser.parse_args()
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return args
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def get_ignored_params(model):
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# Generator function that yields ignored params.
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b = []
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b.append(model.conv1)
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b.append(model.bn1)
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b.append(model.layer1)
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b.append(model.layer2)
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b.append(model.layer3)
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b.append(model.layer4)
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b.append(model.fc_yaw)
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b.append(model.fc_pitch)
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b.append(model.fc_roll)
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for i in range(len(b)):
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for module_name, module in b[i].named_modules():
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if 'bn' in module_name:
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module.eval()
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for name, param in module.named_parameters():
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yield param
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def get_non_ignored_params(model):
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# Generator function that yields params that will be optimized.
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b = []
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b.append(model.conv1x1)
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for i in range(len(b)):
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for module_name, module in b[i].named_modules():
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if 'bn' in module_name:
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module.eval()
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for name, param in module.named_parameters():
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yield param
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def get_fc_params(model):
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b = []
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b.append(model.fc_finetune_new)
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for i in range(len(b)):
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for module_name, module in b[i].named_modules():
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for name, param in module.named_parameters():
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yield param
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def load_filtered_state_dict(model, snapshot):
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# By user apaszke from discuss.pytorch.org
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model_dict = model.state_dict()
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# 1. filter out unnecessary keys
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snapshot = {k: v for k, v in snapshot.items() if k in model_dict}
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# 2. overwrite entries in the existing state dict
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model_dict.update(snapshot)
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# 3. load the new state dict
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model.load_state_dict(model_dict)
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if __name__ == '__main__':
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args = parse_args()
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cudnn.enabled = True
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num_epochs_ft = args.num_epochs_ft
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batch_size = args.batch_size
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gpu = args.gpu_id
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if not os.path.exists('output/snapshots'):
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os.makedirs('output/snapshots')
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model = hopenet.Hopenet_new(torchvision.models.resnet.Bottleneck, [3, 4, 6, 3], 66)
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if args.snapshot != '':
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load_filtered_state_dict(model, torch.load(args.snapshot))
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else:
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load_filtered_state_dict(model, model_zoo.load_url(model_urls['resnet50']))
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print 'Loading data.'
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transformations = transforms.Compose([transforms.Scale(240),
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transforms.RandomCrop(224), transforms.ToTensor(),
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transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])])
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if args.dataset == 'Pose_300W_LP':
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pose_dataset = datasets.Pose_300W_LP(args.data_dir, args.filename_list, transformations)
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elif args.dataset == 'AFLW2000':
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pose_dataset = datasets.AFLW2000(args.data_dir, args.filename_list, transformations)
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elif args.dataset == 'BIWI':
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pose_dataset = datasets.BIWI(args.data_dir, args.filename_list, transformations)
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elif args.dataset == 'AFLW':
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pose_dataset = datasets.AFLW(args.data_dir, args.filename_list, transformations)
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elif args.dataset == 'AFLW_aug':
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pose_dataset = datasets.AFLW_aug(args.data_dir, args.filename_list, transformations)
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elif args.dataset == 'AFW':
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pose_dataset = datasets.AFW(args.data_dir, args.filename_list, transformations)
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else:
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print 'Error: not a valid dataset name'
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sys.exit()
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train_loader = torch.utils.data.DataLoader(dataset=pose_dataset,
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batch_size=batch_size,
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shuffle=True,
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num_workers=2)
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model.cuda(gpu)
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softmax = nn.Softmax()
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criterion = nn.CrossEntropyLoss().cuda()
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reg_criterion = nn.MSELoss().cuda()
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smooth_l1_loss = nn.SmoothL1Loss().cuda()
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# Regression loss coefficient
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alpha = args.alpha
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optimizer = torch.optim.Adam([{'params': get_ignored_params(model), 'lr': 0},
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{'params': get_non_ignored_params(model), 'lr': args.lr},
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{'params': get_fc_params(model), 'lr': args.lr}],
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lr = args.lr)
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print 'Ready to train network.'
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print 'Second phase of training (finetuning layer).'
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for epoch in range(num_epochs_ft):
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for i, (images, labels, cont_labels, name) in enumerate(train_loader):
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images = Variable(images.cuda(gpu))
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label_angles = Variable(cont_labels[:,:3].cuda(gpu))
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optimizer.zero_grad()
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model.zero_grad()
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pre_yaw, pre_pitch, pre_roll, preangles, final_angles = model(images)
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# Finetuning loss
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loss_seq = []
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loss_angles = smooth_l1_loss(final_angles, label_angles)
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loss_seq.append(loss_angles)
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grad_seq = [torch.Tensor(1).cuda(gpu) for _ in range(len(loss_seq))]
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torch.autograd.backward(loss_seq, grad_seq)
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optimizer.step()
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if (i+1) % 100 == 0:
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print ('Epoch [%d/%d], Iter [%d/%d] Losses: finetuning %.4f'
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%(epoch+1, num_epochs_ft, i+1, len(pose_dataset)//batch_size, loss_angles.data[0]))
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# Save models at numbered epochs.
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if epoch % 1 == 0 and epoch < num_epochs_ft:
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print 'Taking snapshot...'
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torch.save(model.state_dict(),
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'output/snapshots/' + args.output_string + '_epoch_'+ str(epoch+1) + '.pkl')
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