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nDCG can not be called with float targets

nDCG can not be called with float targets: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Invoking RetrievalNormalizedNDCG & retrieval normalized dcg with target of type float results into ValueError: target must be a tensor of booleans or integers

The task

Invoking `RetrievalNormalizedNDCG` & `retrieval_normalized_dcg` with target of type float results into `ValueError: `target` must be a tensor of booleans or integers`

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.