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# Ultralytics YOLO 🚀, AGPL-3.0 license
import torch
from ultralytics.data.augment import LetterBox
from ultralytics.engine.predictor import BasePredictor
from ultralytics.engine.results import Results
from ultralytics.utils import ops
class RTDETRPredictor(BasePredictor):
"""
A class extending the BasePredictor class for prediction based on an RT-DETR detection model.
Example:
```python
from ultralytics.utils import ASSETS
from ultralytics.models.rtdetr import RTDETRPredictor
args = dict(model='rtdetr-l.pt', source=ASSETS)
predictor = RTDETRPredictor(overrides=args)
predictor.predict_cli()
```
"""
def postprocess(self, preds, img, orig_imgs):
"""Postprocess predictions and returns a list of Results objects."""
nd = preds[0].shape[-1]
bboxes, scores = preds[0].split((4, nd - 4), dim=-1)
results = []
is_list = isinstance(orig_imgs, list) # input images are a list, not a torch.Tensor
for i, bbox in enumerate(bboxes): # (300, 4)
bbox = ops.xywh2xyxy(bbox)
score, cls = scores[i].max(-1, keepdim=True) # (300, 1)
idx = score.squeeze(-1) > self.args.conf # (300, )
if self.args.classes is not None:
idx = (cls == torch.tensor(self.args.classes, device=cls.device)).any(1) & idx
pred = torch.cat([bbox, score, cls], dim=-1)[idx] # filter
orig_img = orig_imgs[i] if is_list else orig_imgs
oh, ow = orig_img.shape[:2]
if is_list:
pred[..., [0, 2]] *= ow
pred[..., [1, 3]] *= oh
img_path = self.batch[0][i]
results.append(Results(orig_img, path=img_path, names=self.model.names, boxes=pred))
return results
def pre_transform(self, im):
"""Pre-transform input image before inference.
Args:
im (List(np.ndarray)): (N, 3, h, w) for tensor, [(h, w, 3) x N] for list.
Notes: The size must be square(640) and scaleFilled.
Returns:
(list): A list of transformed imgs.
"""
return [LetterBox(self.imgsz, auto=False, scaleFill=True)(image=x) for x in im]
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