目标检测论文：SSD: Single Shot MultiBox Detector及其PyTorch实现

SSD: Single Shot MultiBox Detector
论文链接:https://arxiv.org/pdf/1512.02325.pdf
Pytorch代码：https://github.com/shanglianlm0525/PyTorch-Networks

Pytorch代码：

import torch
import torch.nn as nn
import torchvision
import cv2

def Conv3x3BNReLU(in_channels,out_channels,stride,padding=1):
    return nn.Sequential(
            nn.Conv2d(in_channels=in_channels, out_channels=out_channels, kernel_size=3, stride=stride, padding=padding),
            nn.BatchNorm2d(out_channels),
            n