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[Bugfix][Frontend] Aggregate completion cached tokens - #58116
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Problem: Batched completion responses report cached_tokens from only the first streamed prompt or the last non-streamed prompt. The reported value is incomplete and streaming results depend on completion order. Solution: Track streamed cached token counts by prompt index and sum non-streamed results across the batch. Add regression tests for batched and out-of-order streaming responses. Signed-off-by: tangming1996 <ming.tang@daocloud.io>
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Problem: Batched completion responses report cached_tokens from only the first streamed prompt or the last non-streamed prompt. The reported value is incomplete and streaming results depend on completion order.
Solution: Track streamed cached token counts by prompt index and sum non-streamed results across the batch. Add regression tests for batched and out-of-order streaming responses.
Purpose
Test Plan
Test Result
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