b2r66sun

### Prerequisite - [X] I have searched [Issues](https://github.com/open-compass/opencompass/issues/) and [Discussions](https://github.com/open-compass/opencompass/discussions) but cannot get the expected help. - [X] The bug has not been fixed in the [latest version](https://github.com/open-compass/opencompass). ### Type...

fix: Correctly squeeze the window dataset to adapt to cross entropy l…

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## Summary Transformer model in freqai utilizes a window dataset, in which squeeze operation in tensor raises bugs when the loss is switched to cross entropy for classifier models. This...