Fix cache offset casting with low precision policies #299
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Currently running bf16 llama with long left-padded sequences produces wrong results. This is because we have an integer
cache.offsetand casting to bf16 causes overflows for large values.Axon used to cast integers according to model policy, but that's no longer the case as of elixir-nx/axon#547, so we can keep offset as an integer and it's all good.