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train.py
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train.py
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import torch
import torchvision.transforms as transforms
import torch.optim as optim
import torchvision.transforms.functional as FT
from tqdm import tqdm
from torch.utils.data import DataLoader
from model import Yolov1
from dataset import VOCDataset
from utils import(
intersection_over_union,
non_max_suppression,
mean_average_precision,
cellboxes_to_boxes,
get_bboxes,
plot_image,
save_checkpoint,
load_checkpoint
)
from loss import YoloLoss
seed = 123
torch.manual_seed(seed)
# Hyperparameters etc.
LEARNING_RATE = 2e-5
DEVICE = "cuda:0" if torch.cuda.is_available() else "cpu"
BATCH_SIZE = 16
WEIGHT_DECAY = 0
EPOCHS = 1000
NUM_WORKERS = 2
PIN_MEMORY = True
LOAD_MODEL = False
LOAD_MODEL_FILE = "overfit.pth.tar"
IMG_DIR = "data/images"
LABEL_DIR = "data/labels"
class Compose(object):
def __init__(self, transforms):
self.transforms = transforms
def __call__(self, img, bboxes):
for t in self.transforms:
img, bboxes = t(img), bboxes
return img, bboxes
transform = Compose([transforms.Resize((448, 448)), transforms.ToTensor(),])
def train_fn(train_loader, model, optimizer, loss_fn):
loop = tqdm(train_loader, leave=True)
mean_loss = []
for batch_idx, (x, y) in enumerate(loop):
x, y = x.to(DEVICE), y.to(DEVICE)
out = model(x)
loss = loss_fn(out, y)
mean_loss.append(loss.item())
optimizer.zero_grad()
loss.backward()
optimizer.step()
# Update the progress bar
loop.set_postfix(loss=loss.item())
print(f"Mean loss was {sum(mean_loss)/len(mean_loss)}")
def main():
model = Yolov1(split_size=7, num_boxes=2, num_classes=20).to(DEVICE)
optimizer = optim.Adam(
model.parameters(), lr=LEARNING_RATE, weight_decay=WEIGHT_DECAY
)
loss_fn = YoloLoss()
if LOAD_MODEL:
load_checkpoint(torch.load(LOAD_MODEL_FILE), model, optimizer)
train_dataset = VOCDataset(
"data/100examples.csv",
transform=transform,
img_dir=IMG_DIR,
label_dir=LABEL_DIR
)
test_dataset = VOCDataset(
"data/test.csv",
transform=transform,
img_dir=IMG_DIR,
label_dir=LABEL_DIR
)
train_loader = DataLoader(
dataset=train_dataset,
batch_size=BATCH_SIZE,
num_workers=NUM_WORKERS,
pin_memory=PIN_MEMORY,
shuffle=True,
drop_last=True
)
test_loader = DataLoader(
dataset=test_dataset,
batch_size=BATCH_SIZE,
num_workers=NUM_WORKERS,
pin_memory=PIN_MEMORY,
shuffle=True,
drop_last=True
)
for epoch in range(EPOCHS):
pred_boxes, target_boxes = get_bboxes(
train_loader, model, iou_threshold=0.5, threshold=0.4
)
mean_avg_prec = mean_average_precision(
pred_boxes, target_boxes, iou_threshold=0.5, box_format="midpoint"
)
print(f"Train mAP in {epoch}: {mean_avg_prec}")
train_fn(train_loader, model, optimizer, loss_fn)
if __name__ == "__main__":
main()