yolov5核心代码
时间: 2023-10-21 08:04:57 浏览: 36
yolov5的核心代码包括anchor匹配策略、跨网格预测、compute_loss(p, targets, model)和build_targets(p, targets, model)等。其中,anchor匹配策略用于在目标检测中匹配默认框和真实框,跨网格预测则是通过利用不同尺度的特征图进行目标检测。compute_loss函数用于计算目标检测的损失值,而build_targets函数则用于构建目标检测的目标。
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yoloV5核心代码
以下是YOLOv5的核心代码,包括模型定义和推断:
模型定义:
```python
class YOLOv5(nn.Module):
def __init__(self, cfg='yolov5s.yaml', ch=3, nc=None): # model, input channels, number of classes
super(YOLOv5, self).__init__()
# Model
self.model, self.save = parse_model(deepcopy(model), ch=[ch], nc=nc) # model, savelist = model(items)
# Save and reduce
self.nc, self.nde = nc, next(i for i, x in enumerate(
reversed([getattr(self.model, 'stride', [None])[-1] if hasattr(self.model, 'stride') else None for _ in
range(2)]))) # number of classes, depth
self.stride = int(2 ** self.nde)
self.names = ['P{}'.format(i) for i in range(self.nde + 1)]
self.names.append('anchor')
self.names.append('stride')
self.names.append('indices')
self.names.append('nl')
self.names.append('nc')
self.names.append('version')
# Anchors
self.nl = len(self.model)
self.na = self.model[self.nl - 1].na
self.no = self.na * (self.nc + 5)
# Detect
self.detect = Detect(self.nc, anchors=self.model[self.nl - 1].anchor)
def forward(self, x):
# x = self.forward_features(x)
# x = self.forward_anchors(x)
# x = self.forward_detect(x)
return self.detect(self.model(x))
```
推断:
```python
def non_max_suppression(prediction, conf_thres=0.25, iou_thres=0.45, classes=None, agnostic=False):
"""Performs Non-Maximum Suppression (NMS) on inference results
Returns:
detections with shape: nx6 (x1, y1, x2, y2, conf, cls)
"""
# Settings
xc = prediction[..., 4] > conf_thres # candidates
min_wh, max_wh = 2, 4096 # (pixels) minimum and maximum box width and height
max_det = 300 # maximum number of detections per image
time_limit = 10.0 # seconds to quit after
redundant = True # require redundant detections
multi_label = classes is not None # multiple labels per box (adds 0.5ms/img)
t = time.time()
output = [torch.zeros((0, 6), device=prediction.device)] * prediction.shape[0]
for xi, x in enumerate(prediction): # image index, image inference
# Apply constraints
x = x[xc[xi]] # confidence
x[:, :4] = clip_coords(x[:, :4], (height, width))
if multi_label:
i, j = (x[:, 5:] > conf_thres).nonzero(as_tuple=False).T
x = torch.cat((x[i], x[j]), 0) if i.numel() and j.numel() else x[i + j]
else: # best class only
conf, j = x[:, 5:].max(1, keepdim=True)
x = torch.cat((x[:, :5], conf, j.float()), 1)[conf.view(-1) > conf_thres]
# If none remain process next image
n = x.shape[0] # number of boxes
if not n:
continue
# Sort by confidence
x = x[x[:, 4].argsort(descending=True)]
# Batched NMS
c = x[:, 5:6] * (0 if agnostic else max_wh) # classes
boxes, scores = x[:, :4] + c, x[:, 4] # boxes (offset by class), scores
i = torchvision.ops.boxes.nms(boxes, scores, iou_thres)
if i.shape[0] > max_det: # limit detections
i = i[:max_det]
if redundant: # redundant detections
j = torchvision.ops.boxes.box_iou(boxes[i], boxes).view(-1, n) > iou_thres
i = i[j.sum(1) == 1]
# Append detections
output[xi] = torch.cat((x[i], boxes[i]), 1)
# Break if time limit exceeded
if (time.time() - t) > time_limit:
break # time limit exceeded
return output if len(output) > 1 else output[0]
```
yolov5代码详解
引用\[1\]:以上就是yolov5项目代码的整体介绍。我们训练和测试自己的数据集基本就是利用到如上的代码。\[1\]引用\[2\]:在利用自己的数据集进行训练时,需要将配置文件中的路径进行修改,改成自己对应的数据集所在目录,最好复制+重命名。\[2\]引用\[3\]:yolov5——detect.py代码【注释、详解、使用教程】\[3\]
yolov5代码是一个用于目标检测的深度学习项目。它包含了训练和测试自己的数据集的代码。在训练时,我们需要修改配置文件中的路径,将其改成自己数据集所在的目录,并最好复制并重命名配置文件。\[1\]\[2\]
detect.py是yolov5项目中的一个代码文件,它包含了一些函数和操作,用于进行目标检测。其中,parse_opt()函数用于解析命令行参数,main()函数是程序的入口函数,run()函数是进行目标检测的核心函数。run()函数中包括了参数传递、配置初始化、数据加载、输入预测、NMS(非极大值抑制)、结果保存和打印等步骤。\[3\]
如果你对yolov5代码的详细解释和使用教程感兴趣,可以参考\[3\]中的注释和详解部分,以及其中提供的使用教程。这些资源将帮助你更好地理解和使用yolov5代码。
#### 引用[.reference_title]
- *1* *2* [YOLOV5源码的详细解读](https://blog.csdn.net/BGMcat/article/details/120930016)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [yolov5——detect.py代码【注释、详解、使用教程】](https://blog.csdn.net/CharmsLUO/article/details/123422822)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control,239^v3^insert_chatgpt"}} ] [.reference_item]
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