train_network.py

import argparse
import datetime
import logging
import os
import sys

import cv2
import tensorboardX
import torch
import torch.optim as optim
import torch.utils.data
from torchsummary import summary

from inference.model import GenerativeResnet
from inference.post_process import post_process_output
from utils.data import get_dataset
from utils.dataset_processing import evaluation
from utils.visualisation.gridshow import gridshow

logging.basicConfig(level=logging.INFO)


def parse_args():
    parser = argparse.ArgumentParser(description='Train network')

    # Dataset & Data & Training
    parser.add_argument('--dataset', type=str, help='Dataset Name ("cornell" or "jaquard")')
    parser.add_argument('--dataset-path', type=str, help='Path to dataset')
    parser.add_argument('--use-depth', type=int, default=1, help='Use Depth image for training (1/0)')
    parser.add_argument('--use-rgb', type=int, default=0, help='Use RGB image for training (0/1)')
    parser.add_argument('--split', type=float, default=0.9, help='Fraction of data for training (remainder is validation)')
    parser.add_argument('--ds-rotate', type=float, default=0.0,
                        help='Shift the start point of the dataset to use a different test/train split for cross validation.')
    parser.add_argument('--num-workers', type=int, default=8, help='Dataset workers')

    parser.add_argument('--batch-size', type=int, default=8, help='Batch size')
    parser.add_argument('--epochs', type=int, default=50, help='Training epochs')
    parser.add_argument('--batches-per-epoch', type=int, default=1000, help='Batches per Epoch')
    parser.add_argument('--val-batches', type=int, default=250, help='Validation Batches')

    # Logging etc.
    parser.add_argument('--description', type=str, default='', help='Training description')
    parser.add_argument('--outdir', type=str, default='output/models/', help='Training Output Directory')
    parser.add_argument('--logdir', type=str, default='tensorboard/', help='Log directory')
    parser.add_argument('--vis', action='store_true', help='Visualise the training process')

    args = parser.parse_args()
    return args


def validate(net, device, val_data, batches_per_epoch):
    """
    Run validation.
    :param net: Network
    :param device: Torch device
    :param val_data: Validation Dataset
    :param batches_per_epoch: Number of batches to run
    :return: Successes, Failures and Losses
    """
    net.eval()

    results = {
        'correct': 0,
        'failed': 0,
        'loss': 0,
        'losses': {

        }
    }

    ld = len(val_data)

    with torch.no_grad():
        batch_idx = 0
        while batch_idx < batches_per_epoch:
            for x, y, didx, rot, zoom_factor in val_data:
                batch_idx += 1
                if batches_per_epoch is not None and batch_idx >= batches_per_epoch:
                    break

                xc = x.to(device)
                yc = [yy.to(device) for yy in y]
                lossd = net.compute_loss(xc, yc)

                loss = lossd['loss']

                results['loss'] += loss.item()/ld
                for ln, l in lossd['losses'].items():
                    if ln not in results['losses']:
                        results['losses'][ln] = 0
                    results['losses'][ln] += l.item()/ld

                q_out, ang_out, w_out = post_process_output(lossd['pred']['pos'], lossd['pred']['cos'],
                                                            lossd['pred']['sin'], lossd['pred']['width'])

                s = evaluation.calculate_iou_match(q_out, ang_out,
                                                   val_data.dataset.get_gtbb(didx, rot, zoom_factor),
                                                   no_grasps=1,
                                                   grasp_width=w_out,
                                                   )

                if s:
                    results['correct'] += 1
                else:
                    results['failed'] += 1

    return results


def train(epoch, net, device, train_data, optimizer, batches_per_epoch, vis=False):
    """
    Run one training epoch
    :param epoch: Current epoch
    :param net: Network
    :param device: Torch device
    :param train_data: Training Dataset
    :param optimizer: Optimizer
    :param batches_per_epoch:  Data batches to train on
    :param vis:  Visualise training progress
    :return:  Average Losses for Epoch
    """
    results = {
        'loss': 0,
        'losses': {
        }
    }

    net.train()

    batch_idx = 0
    # Use batches per epoch to make training on different sized datasets (cornell/jacquard) more equivalent.
    while batch_idx < batches_per_epoch:
        for x, y, _, _, _ in train_data:
            batch_idx += 1
            if batch_idx >= batches_per_epoch:
                break

            xc = x.to(device)
            yc = [yy.to(device) for yy in y]
            lossd = net.compute_loss(xc, yc)

            loss = lossd['loss']

            if batch_idx % 100 == 0:
                logging.info('Epoch: {}, Batch: {}, Loss: {:0.4f}'.format(epoch, batch_idx, loss.item()))

            results['loss'] += loss.item()
            for ln, l in lossd['losses'].items():
                if ln not in results['losses']:
                    results['losses'][ln] = 0
                results['losses'][ln] += l.item()

            optimizer.zero_grad()
            loss.backward()
            optimizer.step()

            # Display the images
            if vis:
                imgs = []
                n_img = min(4, x.shape[0])
                for idx in range(n_img):
                    imgs.extend([x[idx,].numpy().squeeze()] + [yi[idx,].numpy().squeeze() for yi in y] + [
                        x[idx,].numpy().squeeze()] + [pc[idx,].detach().cpu().numpy().squeeze() for pc in lossd['pred'].values()])
                gridshow('Display', imgs,
                         [(xc.min().item(), xc.max().item()), (0.0, 1.0), (0.0, 1.0), (-1.0, 1.0), (0.0, 1.0)] * 2 * n_img,
                         [cv2.COLORMAP_BONE] * 10 * n_img, 10)
                cv2.waitKey(2)

    results['loss'] /= batch_idx
    for l in results['losses']:
        results['losses'][l] /= batch_idx

    return results


def run():
    args = parse_args()

    # Set-up output directories
    dt = datetime.datetime.now().strftime('%y%m%d_%H%M')
    net_desc = '{}_{}'.format(dt, '_'.join(args.description.split()))

    save_folder = os.path.join(args.outdir, net_desc)
    if not os.path.exists(save_folder):
        os.makedirs(save_folder)
    tb = tensorboardX.SummaryWriter(os.path.join(args.logdir, net_desc))

    # Load Dataset
    logging.info('Loading {} Dataset...'.format(args.dataset.title()))
    Dataset = get_dataset(args.dataset)

    train_dataset = Dataset(args.dataset_path,
                            start=0.0,
                            end=args.split,
                            ds_rotate=args.ds_rotate,
                            random_rotate=True,
                            random_zoom=True,
                            include_depth=args.use_depth,
                            include_rgb=args.use_rgb)
    train_data = torch.utils.data.DataLoader(
        train_dataset,
        batch_size=args.batch_size,
        shuffle=True,
        num_workers=args.num_workers
    )
    val_dataset = Dataset(args.dataset_path,
                          start=args.split,
                          end=1.0,
                          ds_rotate=args.ds_rotate,
                          random_rotate=True,
                          random_zoom=True,
                          include_depth=args.use_depth,
                          include_rgb=args.use_rgb)
    val_data = torch.utils.data.DataLoader(
        val_dataset,
        batch_size=1,
        shuffle=False,
        num_workers=args.num_workers
    )
    logging.info('Done')

    # Load the network
    logging.info('Loading Network...')
    input_channels = 1*args.use_depth + 3*args.use_rgb

    net = GenerativeResnet(input_channels=input_channels)
    device = torch.device("cuda:0")
    net = net.to(device)
    optimizer = optim.Adam(net.parameters())
    logging.info('Done')

    # Print model architecture.
    summary(net, (input_channels, 300, 300))
    f = open(os.path.join(save_folder, 'arch.txt'), 'w')
    sys.stdout = f
    summary(net, (input_channels, 300, 300))
    sys.stdout = sys.__stdout__
    f.close()

    best_iou = 0.0
    for epoch in range(args.epochs):
        logging.info('Beginning Epoch {:02d}'.format(epoch))
        train_results = train(epoch, net, device, train_data, optimizer, args.batches_per_epoch, vis=args.vis)

        # Log training losses to tensorboard
        tb.add_scalar('loss/train_loss', train_results['loss'], epoch)
        for n, l in train_results['losses'].items():
            tb.add_scalar('train_loss/' + n, l, epoch)

        # Run Validation
        logging.info('Validating...')
        test_results = validate(net, device, val_data, args.val_batches)
        logging.info('%d/%d = %f' % (test_results['correct'], test_results['correct'] + test_results['failed'],
                                     test_results['correct']/(test_results['correct']+test_results['failed'])))

        # Log validation results to tensorbaord
        tb.add_scalar('loss/IOU', test_results['correct'] / (test_results['correct'] + test_results['failed']), epoch)
        tb.add_scalar('loss/val_loss', test_results['loss'], epoch)
        for n, l in test_results['losses'].items():
            tb.add_scalar('val_loss/' + n, l, epoch)

        # Save best performing network
        iou = test_results['correct'] / (test_results['correct'] + test_results['failed'])
        if iou > best_iou or epoch == 0 or (epoch % 10) == 0:
            torch.save(net, os.path.join(save_folder, 'epoch_%02d_iou_%0.2f' % (epoch, iou)))
            best_iou = iou


if __name__ == '__main__':
    run()