Equation 19 · Part 2 · The Hardest Unsolved Problems in Small and On-Device AI
Symbol delta
What this part means
delta is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
delta is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol delta→Article meaning
The passage around this formula
…even though raw data stays local [ 7 ] . Its response is differential privacy: each client “locally clips and perturbs its LoRA matrices using Gaussian noise” before anything is sent, with a formal (, ) -differential-privacy guarantee attached [ 7 ] . That noise is not free — it is a second trade-off, alongside the memory one, between how much personalization signal survives and how strong the privacy guarantee is.
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Sources cited in the surrounding passage
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