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# Ultralytics YOLO 🚀, AGPL-3.0 license
from copy import copy
import torch
from ultralytics.models.yolo.detect import DetectionTrainer
from ultralytics.nn.tasks import RTDETRDetectionModel
from ultralytics.utils import RANK, colorstr
from .val import RTDETRDataset, RTDETRValidator
class RTDETRTrainer(DetectionTrainer):
"""
Trainer class for the RT-DETR model developed by Baidu for real-time object detection. Extends the DetectionTrainer
class for YOLO to adapt to the specific features and architecture of RT-DETR. This model leverages Vision
Transformers and has capabilities like IoU-aware query selection and adaptable inference speed.
Notes:
- F.grid_sample used in RT-DETR does not support the `deterministic=True` argument.
- AMP training can lead to NaN outputs and may produce errors during bipartite graph matching.
Example:
```python
from ultralytics.models.rtdetr.train import RTDETRTrainer
args = dict(model='rtdetr-l.yaml', data='coco8.yaml', imgsz=640, epochs=3)
trainer = RTDETRTrainer(overrides=args)
trainer.train()
```
"""
def get_model(self, cfg=None, weights=None, verbose=True):
"""
Initialize and return an RT-DETR model for object detection tasks.
Args:
cfg (dict, optional): Model configuration. Defaults to None.
weights (str, optional): Path to pre-trained model weights. Defaults to None.
verbose (bool): Verbose logging if True. Defaults to True.
Returns:
(RTDETRDetectionModel): Initialized model.
"""
model = RTDETRDetectionModel(cfg, nc=self.data["nc"], verbose=verbose and RANK == -1)
if weights:
model.load(weights)
return model
def build_dataset(self, img_path, mode="val", batch=None):
"""
Build and return an RT-DETR dataset for training or validation.
Args:
img_path (str): Path to the folder containing images.
mode (str): Dataset mode, either 'train' or 'val'.
batch (int, optional): Batch size for rectangle training. Defaults to None.
Returns:
(RTDETRDataset): Dataset object for the specific mode.
"""
return RTDETRDataset(
img_path=img_path,
imgsz=self.args.imgsz,
batch_size=batch,
augment=mode == "train",
hyp=self.args,
rect=False,
cache=self.args.cache or None,
prefix=colorstr(f"{mode}: "),
data=self.data,
)
def get_validator(self):
"""
Returns a DetectionValidator suitable for RT-DETR model validation.
Returns:
(RTDETRValidator): Validator object for model validation.
"""
self.loss_names = "giou_loss", "cls_loss", "l1_loss"
return RTDETRValidator(self.test_loader, save_dir=self.save_dir, args=copy(self.args))
def preprocess_batch(self, batch):
"""
Preprocess a batch of images. Scales and converts the images to float format.
Args:
batch (dict): Dictionary containing a batch of images, bboxes, and labels.
Returns:
(dict): Preprocessed batch.
"""
batch = super().preprocess_batch(batch)
bs = len(batch["img"])
batch_idx = batch["batch_idx"]
gt_bbox, gt_class = [], []
for i in range(bs):
gt_bbox.append(batch["bboxes"][batch_idx == i].to(batch_idx.device))
gt_class.append(batch["cls"][batch_idx == i].to(device=batch_idx.device, dtype=torch.long))
return batch
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