def main(train_path="../data/train/images/",
val_path="../data/train/images/",
labels_path="../data/train/yolo_labels/",
weights_path="../checkpoints/",
preload_weights_file="darknet53.conv.74",
output_path="../output",
yolo_config_file="../config/yolov3-kitti.cfg",
fraction=1,
learning_rate=1e-3,
weight_decay=1e-4,
batch_size=2,
epochs=30,
freeze_struct=[True, 5]):
"""
This is the point of entry to the neural network program.
All the training history will be saved as a csv in the output path
Args
train_path (string): Directory containing the training images
val_path (string):: Directory containing the val images
labels_path (string):: Directory containing the yolo format labels for data
weights_path (string):: Directory containing the weights (new weights for this program will also be added here)
preload_weights_file (string): Name of preload weights file
output_path (string): Directory to store the training history outputs as csv
yolo_config_file (string): file path of yolo configuration file
fraction (float): fraction of data to use for training
learning_rate (float): initial learning rate
weight_decay (float): weight decay value
batch_size (int): batch_size for both training and validation
epochs (int): maximum number of epochs to train the model
freeze_struct (list): [bool, int] indicating whether to freeze the Darknet backbone and until which epoch should it be frozen
Returns
None
"""
# Set up checkpoints path
checkpoints_path = weights_path
# Set up env variables and create required directories
os.makedirs(output_path, exist_ok=True)
os.makedirs(checkpoints_path, exist_ok=True)
# Set up cuda
use_cuda = torch.cuda.is_available()
device = torch.device("cuda" if use_cuda else "cpu")
print("Available device = ", device)
# Create model and load pretrained darknet weights
model = Darknet(yolo_config_file)
print("Loading imagenet weights to darknet")
model.load_weights(os.path.join(weights_path, preload_weights_file))
model.to(device)
#print(model)
# Create datasets
train_dataset = KITTI2D(train_path,
labels_path,
fraction=fraction,
train=True)
valid_dataset = KITTI2D(val_path,
labels_path,
fraction=fraction,
train=False)
# Create dataloaders
train_dataloader = DataLoader(train_dataset,
batch_size=batch_size,
shuffle=True)
valid_dataloader = DataLoader(valid_dataset,
batch_size=batch_size,
shuffle=False)
# Create optimizers
optimizer = torch.optim.Adam(filter(lambda p: p.requires_grad,
model.parameters()),
lr=learning_rate,
weight_decay=weight_decay)
lr_scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, 10)
# Create log csv files
train_log_file = open(os.path.join(output_path, "train_results.csv"),
"w",
newline="")
valid_log_file = open(os.path.join(output_path, "valid_results.csv"),
"w",
newline="")
train_csv = csv.writer(train_log_file)
valid_csv = csv.writer(valid_log_file)
print("Starting to train yolov3 model...")
# Train model here
train_model(model,
device,
optimizer,
lr_scheduler,
train_dataloader,
valid_dataloader,
train_csv,
valid_csv,
weights_path,
max_epochs=epochs,
tensor_type=torch.cuda.FloatTensor,
update_gradient_samples=1,
freeze_darknet=freeze_struct[0],
freeze_epoch=freeze_struct[1])
# Close the log files
train_log_file.close()
valid_log_file.close()
print("Training completed")
import os
import sys
weights = './pretrained.pt'
imgsz = 448
conf_thres = 0.35
iou_thres = 0.5
cfg = './cfg/yolov4-pacsp.cfg'
names = ['fire', 'smoke']
colors = [(255, 30, 0), (50, 0, 255)]
device = torch.device('cpu')
if not os.path.isfile(weights):
# Download weight 200Mb
# torch.hub.download_url_to_file('https://www.dropbox.com/s/a1puv47v6tmrk6j/weights.pt?dl=1', weights)
pass
# Load model
model = Darknet(cfg, imgsz)
# model.load_state_dict(weights)
model.to(device).eval()
source = sys.argv[1]
out = detect(model, source, './out.png', imgsz, conf_thres, iou_thres,
names, colors, device)
cv2.imshow('output', out)
cv2.waitKey(0)
cv2.destroyAllWindows()
