Fix code examples of DETR and YOLOS (#19669)

Co-authored-by: Niels Rogge <nielsrogge@Nielss-MacBook-Pro.local>

src/transformers/models/detr/modeling_detr.py

@@ -1426,16 +1426,16 @@ class DetrForObjectDetection(DetrPreTrainedModel):
 
         >>> # convert outputs (bounding boxes and class logits) to COCO API
         >>> target_sizes = torch.tensor([image.size[::-1]])
-        >>> results = feature_extractor.post_process_object_detection(outputs, target_sizes=target_sizes)[0]
+        >>> results = feature_extractor.post_process_object_detection(
+        ...     outputs, threshold=0.9, target_sizes=target_sizes
+        ... )[0]
 
         >>> for score, label, box in zip(results["scores"], results["labels"], results["boxes"]):
         ...     box = [round(i, 2) for i in box.tolist()]
-        ...     # let's only keep detections with score > 0.9
-        ...     if score > 0.9:
-        ...         print(
-        ...             f"Detected {model.config.id2label[label.item()]} with confidence "
-        ...             f"{round(score.item(), 3)} at location {box}"
-        ...         )
+        ...     print(
+        ...         f"Detected {model.config.id2label[label.item()]} with confidence "
+        ...         f"{round(score.item(), 3)} at location {box}"
+        ...     )
         Detected remote with confidence 0.998 at location [40.16, 70.81, 175.55, 117.98]
         Detected remote with confidence 0.996 at location [333.24, 72.55, 368.33, 187.66]
         Detected couch with confidence 0.995 at location [-0.02, 1.15, 639.73, 473.76]

src/transformers/models/yolos/feature_extraction_yolos.py

@@ -18,7 +18,7 @@ import io
 import pathlib
 import warnings
 from collections import defaultdict
-from typing import Dict, List, Optional, Union
+from typing import Dict, List, Optional, Tuple, Union
 
 import numpy as np
 from PIL import Image
@@ -748,6 +748,61 @@ class YolosFeatureExtractor(FeatureExtractionMixin, ImageFeatureExtractionMixin)
             preds.append(predictions)
         return preds
 
+    # Copied from transformers.models.detr.feature_extraction_detr.DetrFeatureExtractor.post_process_object_detection
+    def post_process_object_detection(
+        self, outputs, threshold: float = 0.5, target_sizes: Union[TensorType, List[Tuple]] = None
+    ):
+        """
+        Converts the output of [`DetrForObjectDetection`] into the format expected by the COCO api. Only supports
+        PyTorch.
+
+        Args:
+            outputs ([`DetrObjectDetectionOutput`]):
+                Raw outputs of the model.
+            threshold (`float`, *optional*):
+                Score threshold to keep object detection predictions.
+            target_sizes (`torch.Tensor` or `List[Tuple[int, int]]`, *optional*, defaults to `None`):
+                Tensor of shape `(batch_size, 2)` or list of tuples (`Tuple[int, int]`) containing the target size
+                (height, width) of each image in the batch. If left to None, predictions will not be resized.
+
+        Returns:
+            `List[Dict]`: A list of dictionaries, each dictionary containing the scores, labels and boxes for an image
+            in the batch as predicted by the model.
+        """
+        out_logits, out_bbox = outputs.logits, outputs.pred_boxes
+
+        if target_sizes is not None:
+            if len(out_logits) != len(target_sizes):
+                raise ValueError(
+                    "Make sure that you pass in as many target sizes as the batch dimension of the logits"
+                )
+
+        prob = nn.functional.softmax(out_logits, -1)
+        scores, labels = prob[..., :-1].max(-1)
+
+        # Convert to [x0, y0, x1, y1] format
+        boxes = center_to_corners_format(out_bbox)
+
+        # Convert from relative [0, 1] to absolute [0, height] coordinates
+        if target_sizes is not None:
+            if isinstance(target_sizes, List):
+                img_h = torch.Tensor([i[0] for i in target_sizes])
+                img_w = torch.Tensor([i[1] for i in target_sizes])
+            else:
+                img_h, img_w = target_sizes.unbind(1)
+
+            scale_fct = torch.stack([img_w, img_h, img_w, img_h], dim=1)
+            boxes = boxes * scale_fct[:, None, :]
+
+        results = []
+        for s, l, b in zip(scores, labels, boxes):
+            score = s[s > threshold]
+            label = l[s > threshold]
+            box = b[s > threshold]
+            results.append({"scores": score, "labels": label, "boxes": box})
+
+        return results
+
     # Copied from transformers.models.detr.feature_extraction_detr.DetrFeatureExtractor.post_process_instance
     def post_process_instance(self, results, outputs, orig_target_sizes, max_target_sizes, threshold=0.5):
         """

src/transformers/models/yolos/modeling_yolos.py

@@ -754,24 +754,39 @@ class YolosForObjectDetection(YolosPreTrainedModel):
         Returns:
 
         Examples:
+
         ```python
-        >>> from transformers import YolosFeatureExtractor, YolosForObjectDetection
+        >>> from transformers import AutoFeatureExtractor, AutoModelForObjectDetection
+        >>> import torch
         >>> from PIL import Image
         >>> import requests
 
         >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
         >>> image = Image.open(requests.get(url, stream=True).raw)
 
-        >>> feature_extractor = YolosFeatureExtractor.from_pretrained("hustvl/yolos-small")
-        >>> model = YolosForObjectDetection.from_pretrained("hustvl/yolos-small")
+        >>> feature_extractor = AutoFeatureExtractor.from_pretrained("hustvl/yolos-tiny")
+        >>> model = AutoModelForObjectDetection.from_pretrained("hustvl/yolos-tiny")
 
         >>> inputs = feature_extractor(images=image, return_tensors="pt")
-
         >>> outputs = model(**inputs)
 
-        >>> # model predicts bounding boxes and corresponding COCO classes
-        >>> logits = outputs.logits
-        >>> bboxes = outputs.pred_boxes
+        >>> # convert outputs (bounding boxes and class logits) to COCO API
+        >>> target_sizes = torch.tensor([image.size[::-1]])
+        >>> results = feature_extractor.post_process_object_detection(
+        ...     outputs, threshold=0.9, target_sizes=target_sizes
+        ... )[0]
+
+        >>> for score, label, box in zip(results["scores"], results["labels"], results["boxes"]):
+        ...     box = [round(i, 2) for i in box.tolist()]
+        ...     print(
+        ...         f"Detected {model.config.id2label[label.item()]} with confidence "
+        ...         f"{round(score.item(), 3)} at location {box}"
+        ...     )
+        Detected remote with confidence 0.994 at location [46.96, 72.61, 181.02, 119.73]
+        Detected remote with confidence 0.975 at location [340.66, 79.19, 372.59, 192.65]
+        Detected cat with confidence 0.984 at location [12.27, 54.25, 319.42, 470.99]
+        Detected remote with confidence 0.922 at location [41.66, 71.96, 178.7, 120.33]
+        Detected cat with confidence 0.914 at location [342.34, 21.48, 638.64, 372.46]
         ```"""
         return_dict = return_dict if return_dict is not None else self.config.use_return_dict