ValueError: Expected more than 1 value per channel when training, got input size torch.Size([1, 128]

因为用到了BatchNorm，所以batch_size要大于1，drop_last 参数设置为True。

如果是两个GPU训练，batch_size改为4。

参考
ValueError: Expected more than 1 value per channel when training, got input size [1, 16, 1, 1]（解决方案）

Pytorch遇到报错Expected more than 1 value per channel when training, got input size torch.Size