Equation 11 · Part 1 · Actually Deploying an Open-Weight Model in Production
Symbol B
What this part means
the only.
Its job in the formula
B 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 B→Article meaning
Where the article explains it
Only B and A are trained; never moves during fine-tuning [ 5 ] .
The passage around this formula
Only B and A are trained; never moves during fine-tuning [ 5 ] . The effect on trainable parameter count for that one matrix is to fall from dk to r(d + k) , which is small whenever the chosen rank r is small relative to d and k — and because BA can be merged back into after training, LoRA adds…
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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.