Fix dtype casting in spearman and pearson #2379
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What does this PR do?
Fixes #2314
We have guarded in general against frameworks such as deepspeed changing the metric state dtypes. However, for certain metrics this may still happen if the metric overwrites the state directly instead of doing
self.metric_state += batch_update
which nearly all metrics does. This PR simply fixes this for Pearson and Spearman metric.Before submitting
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📚 Documentation preview 📚: https://torchmetrics--2379.org.readthedocs.build/en/2379/