[TOPI] Support non-batch cases for topi.nll_loss #14060
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This PR supports the cases when input does not contain batches for `topi.nll_loss`. When there is no batches, the shape of the prediction parameter is `(C,)`, the shape of the target parameter is `()`, the shape of the target parameter is `(C,)`, and the shape of the output is always `()` no matter which reduction method it uses.
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This PR supports the cases when input does not contain batches for
topi.nll_loss.When there is no batches, the shape of the prediction parameter is
(C,), the shape of the target parameter is(), the shape of the target parameter is(C,), and the shape of the output is always()no matter which reduction method it uses.cc @junrushao @Hzfengsy