前言
环境介绍：
1.编译环境
Ubuntu 18.04.5 LTS
2.RKNN版本
py3.8-rknn2-1.4.0
3.单板
迅为itop-3568开发板
一、现象
采用yolov5训练并将pt转换为onnx，再将onnx采用py3.8-rknn2-1.4.0推理转换为rknn出现置信度大于1，并且图像乱框问题。
类似下面这样
二、解决
经过网上一顿查找发现是在将pt文件转化为onnx时对models/yolo.py的修改有问题。网上大部分的修改都是下面这种
models/yolo.py
def forward(self, x):z = [] # inference outputfor i in range(self.nl):x[i] = self.m[i](x[i]) # convreturn x# def forward(self, x):# z = [] # inference output# for i in range(self.nl):# x[i] = self.m[i](x[i]) # conv # bs, _, ny, nx = x[i].shape # x(bs,255,20,20) to x(bs,3,20,20,85)# x[i] = x[i].view(bs, self.na, self.no, ny, nx).permute(0, 1, 3, 4, 2).contiguous()# if not self.training: # inference# if self.dynamic or self.grid[i].shape[2:4] != x[i].shape[2:4]:# self.grid[i], self.anchor_grid[i] = self._make_grid(nx, ny, i)# if isinstance(self, Segment): # (boxes + masks)# xy, wh, conf, mask = x[i].split((2, 2, self.nc + 1, self.no - self.nc - 5), 4)# xy = (xy.sigmoid() * 2 + self.grid[i]) * self.stride[i] # xy# wh = (wh.sigmoid() * 2) ** 2 * self.anchor_grid[i] # wh# y = torch.cat((xy, wh, conf.sigmoid(), mask), 4)# else: # Detect (boxes only)# xy, wh, conf = x[i].sigmoid().split((2, 2, self.nc + 1), 4)# xy = (xy * 2 + self.grid[i]) * self.stride[i] # xy# wh = (wh * 2) ** 2 * self.anchor_grid[i] # wh# y = torch.cat((xy, wh, conf), 4)# z.append(y.view(bs, self.na * nx * ny, self.no))# return x if self.training else (torch.cat(z, 1),) if self.export else (torch.cat(z, 1), x)
这是导致问题的根源，至于为什么现在我还没办法回答。正确的应该按如下方式修改
models/yolo.py
def forward(self, x):z = [] # inference outputfor i in range(self.nl):if os.getenv('RKNN_model_hack', '0') != '0':x[i] = torch.sigmoid(self.m[i](x[i])) # convreturn x
# def forward(self, x):
# z = [] # inference output
# for i in range(self.nl):
# x[i] = self.m[i](x[i]) # conv
# bs, _, ny, nx = x[i].shape # x(bs,255,20,20) to x(bs,3,20,20,85)
# x[i] = x[i].view(bs, self.na, self.no, ny, nx).permute(0, 1, 3, 4, 2).contiguous()
#
# if not self.training: # inference
# if self.grid[i].shape[2:4] != x[i].shape[2:4] or self.onnx_dynamic:
# self.grid[i] = self._make_grid(nx, ny).to(x[i].device)
#
# y = x[i].sigmoid()
# if self.inplace:
# y[..., 0:2] = (y[..., 0:2] * 2. - 0.5 + self.grid[i]) * self.stride[i] # xy
# y[..., 2:4] = (y[..., 2:4] * 2) ** 2 * self.anchor_grid[i] # wh
# else: # for YOLOv5 on AWS Inferentia https://github.com/ultralytics/yolov5/pull/2953
# xy = (y[..., 0:2] * 2. - 0.5 + self.grid[i]) * self.stride[i] # xy
# wh = (y[..., 2:4] * 2) ** 2 * self.anchor_grid[i].view(1, self.na, 1, 1, 2) # wh
# y = torch.cat((xy, wh, y[..., 4:]), -1)
# z.append(y.view(bs, -1, self.no))
#
# return x if self.training else (torch.cat(z, 1), x)
export.py文件的run函数
# shape = tuple((y[0] if isinstance(y, tuple) else y).shape) # model output shape
shape = tuple(y[0].shape) # model output shape
export.py文件的开头加上
#onn转换添加内容
import os
os.environ['RKNN_model_hack'] = 'npu_2'
#
修改之后按照如下命令导出onnx
其中./runs/train/exp3/weights/best.pt换成自己训练的pt文件
python export.py --weights ./runs/train/exp3/weights/best.pt --img 640 --batch 1 --include onnx --opset 12
参考这位大佬的文件
