Equation 19 · Part 1 · What an AI Accelerator Actually Is: Silicon, Packaging, and the Memory It Can Reach
Symbol Q
What this part means
the number of bytes.
Its job in the formula
Q 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 Q→Article meaning
Where the article explains it
Define arithmetic intensity I as the ratio of arithmetic operations performed to bytes moved between the accelerator and its off-chip memory: I = with W operations and Q bytes.
The passage around this formula
…including 3x on GPT-2 at sequence length 1K and 15% end-to-end on BERT-large at sequence length 512 [ 5 ] . The arithmetic performed did not fall — the result is exact attention, not an approximation. What fell was Q . In roofline terms the kernel was moved to the right along the intensity axis until the compute ceiling became the binding constraint. Fusion, tiling, recomputation and operator scheduling are all, without exception, the same manoeuvre.
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.