Add chunked prefill with prefix KV cache reuse to Tunix Gemma 4.#1597
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- Refactor attention into focused methods for KV projection, cache update with prefix concatenation, and mask construction. - Support sliding window (ring buffer) and linear cache layouts. - Handle PAD masking, KV sharing, and flash attention fallback. - Comprehensive tests for chunked prefill, decode, KV sharing, and PAD masking. PiperOrigin-RevId: 933189977
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Add chunked prefill with prefix KV cache reuse to Tunix Gemma 4.
cache update with prefix concatenation, and mask construction.
and PAD masking.