Training for hopenet works.

natanielruiz

2017-07-07 6664c6d52fad58e396861946a3bed7d5afc4d44d

 code/train_resnet_bins.py

@@ -13,8 +13,17 @@
import os
import argparse

from datasets import Pose_300W_LP
import datasets
import hopenet
import torch.utils.model_zoo as model_zoo

model_urls = {
    'resnet18': 'https://download.pytorch.org/models/resnet18-5c106cde.pth',
    'resnet34': 'https://download.pytorch.org/models/resnet34-333f7ec4.pth',
    'resnet50': 'https://download.pytorch.org/models/resnet50-19c8e357.pth',
    'resnet101': 'https://download.pytorch.org/models/resnet101-5d3b4d8f.pth',
    'resnet152': 'https://download.pytorch.org/models/resnet152-b121ed2d.pth',
}

def parse_args():
    """Parse input arguments."""
@@ -36,6 +45,41 @@

    return args

def get_ignored_params(model):
    # Generator function that yields ignored params.
    b = []
    b.append(model.conv1)
    b.append(model.bn1)
    b.append(model.layer1)
    b.append(model.layer2)
    b.append(model.layer3)
    b.append(model.layer4)
    for i in range(len(b)):
        for j in b[i].modules():
            for k in j.parameters():
                yield k

def get_non_ignored_params(model):
    # Generator function that yields params that will be optimized.
    b = []
    b.append(model.fc_yaw)
    b.append(model.fc_pitch)
    b.append(model.fc_roll)
    for i in range(len(b)):
        for j in b[i].modules():
            for k in j.parameters():
                    yield k

def load_filtered_state_dict(model, snapshot):
    # By user apaszke from discuss.pytorch.org
    model_dict = model.state_dict()
    # 1. filter out unnecessary keys
    snapshot = {k: v for k, v in snapshot.items() if k in model_dict}
    # 2. overwrite entries in the existing state dict
    model_dict.update(snapshot)
    # 3. load the new state dict
    model.load_state_dict(model_dict)

if __name__ == '__main__':
    args = parse_args()

@@ -47,21 +91,16 @@
    if not os.path.exists('output/snapshots'):
        os.makedirs('output/snapshots')

    model = torchvision.models.resnet18(pretrained=True)
    for param in model.parameters():
        param.requires_grad = False
    # Parameters of newly constructed modules have requires_grad=True by default
    num_ftrs = model.fc.in_features
    model.fc_pitch = nn.Linear(num_ftrs, 3)
    model.fc_yaw = nn.Linear(num_ftrs, 3)
    model.fc_roll = nn.Linear(num_ftrs, )

    # ResNet18 with 3 outputs.
    model = hopenet.Hopenet(torchvision.models.resnet.BasicBlock, [2, 2, 2, 2], 66)
    load_filtered_state_dict(model, model_zoo.load_url(model_urls['resnet18']))
    
    print 'Loading data.'

    transformations = transforms.Compose([transforms.Scale(230),transforms.RandomCrop(224),
    transformations = transforms.Compose([transforms.Scale(224),transforms.RandomCrop(224),
                                          transforms.ToTensor()])

    pose_dataset = Pose_300W_LP(args.data_dir, args.filename_list,
    pose_dataset = datasets.Pose_300W_LP_binned(args.data_dir, args.filename_list,
                                transformations)
    train_loader = torch.utils.data.DataLoader(dataset=pose_dataset,
                                               batch_size=batch_size,
@@ -69,31 +108,40 @@
                                               num_workers=2)

    model.cuda(gpu)
    criterion = nn.MSELoss(size_average = True)
    optimizer = torch.optim.Adam(model.fc.parameters(), lr = args.lr)
    criterion = nn.CrossEntropyLoss()
    optimizer = torch.optim.Adam([{'params': get_ignored_params(model), 'lr': .0},
                                  {'params': get_non_ignored_params(model), 'lr': args.lr}],
                                  lr = args.lr)

    print 'Ready to train network.'

    for epoch in range(num_epochs):
        for i, (images, labels) in enumerate(train_loader):
        for i, (images, labels, name) in enumerate(train_loader):
            images = Variable(images).cuda(gpu)
            labels = Variable(labels).cuda(gpu)
            label_yaw = Variable(labels[:,0]).cuda(gpu)
            label_pitch = Variable(labels[:,1]).cuda(gpu)
            label_roll = Variable(labels[:,2]).cuda(gpu)

            optimizer.zero_grad()
            outputs = model(images)
            loss = criterion(outputs, labels)
            loss.backward()
            yaw, pitch, roll = model(images)
            loss_yaw = criterion(yaw, label_yaw)
            loss_pitch = criterion(pitch, label_pitch)
            loss_roll = criterion(roll, label_roll)

            loss_seq = [loss_yaw, loss_pitch, loss_roll]
            grad_seq = [torch.Tensor(1).cuda(gpu) for _ in range(len(loss_seq))]
            torch.autograd.backward(loss_seq, grad_seq)
            optimizer.step()

            if (i+1) % 100 == 0:
                print ('Epoch [%d/%d], Iter [%d/%d] Loss: %.4f'
                       %(epoch+1, num_epochs, i+1, len(pose_dataset)//batch_size, loss.data[0]))
                print ('Epoch [%d/%d], Iter [%d/%d] Losses: Yaw %.4f, Pitch %.4f, Roll %.4f'
                       %(epoch+1, num_epochs, i+1, len(pose_dataset)//batch_size, loss_yaw.data[0], loss_pitch.data[0], loss_roll.data[0]))

        # Save models at even numbered epochs.
        if epoch % 1 == 0 and epoch < num_epochs - 1:
            print 'Taking snapshot...'
            torch.save(model.state_dict(),
            'output/snapshots/resnet18_epoch_' + str(epoch+1) + '.pkl')
            'output/snapshots/resnet18_binned_epoch_' + str(epoch+1) + '.pkl')

    # Save the final Trained Model
    torch.save(model.state_dict(), 'output/snapshots/resnet18_epoch_' + str(epoch+1) + '.pkl')
    torch.save(model.state_dict(), 'output/snapshots/resnet18_binned_epoch_' + str(epoch+1) + '.pkl')