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The difference betwen Log Softmax and Softmax should be understood together with the loss function.

References

https://discuss.pytorch.org/t/what-is-the-difference-between-log-softmax-and-softmax/11801

https://discuss.pytorch.org/t/logsoftmax-vs-softmax/21386

https://forums.fast.ai/t/logsoftmax-vs-softmax/14469