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运行代码时，出现ZeroDivisionError: integer division or modulo by zero问题，具体如下：

Traceback (most recent call last):  File "./tools/train_net.py", line 51, in 
   
        launch(  File "./fastreid/engine/launch.py", line 71, in launch    main_func(*args)  File "./tools/train_net.py", line 45, in main    return trainer.train()  File "./fastreid/engine/defaults.py", line 364, in train    super().train(self.start_epoch, self.max_epoch, self.iters_per_epoch)  File "./fastreid/engine/train_loop.py", line 147, in train    self.after_epoch()  File "./fastreid/engine/train_loop.py", line 181, in after_epoch    h.after_epoch()  File "./fastreid/engine/hooks.py", line 261, in after_epoch    self._scheduler["lr_sched"].step()  File "/home/camila/.local/lib/python3.8/site-packages/torch/optim/lr_scheduler.py", line 154, in step    values = self.get_lr()  File "/home/camila/.local/lib/python3.8/site-packages/torch/optim/lr_scheduler.py", line 513, in get_lr    elif (self.last_epoch - 1 - self.T_max) % (2 * self.T_max) == 0:ZeroDivisionError: integer division or modulo by zero
   

主要原因：

主要是数据量比较小，参数设置epoch_size=10，导致计算得到的运行轮数epoch_size小于10，从而epoch_size // 10结果为0

解决方案：

把参数设置的.yml文件中, 每次迭代输出10次信息更改成1，即epoch_size=10更改为epoch_size=1。成功解决ZeroDivisionError: integer division or modulo by zero问题，特此记录！！！

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