Equation 15 · Part 1 · How AI for Science and Medicine Actually Works
Symbol psi
What this part means
a learned function.
Its job in the formula
psi 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 psi→Article meaning
Where the article explains it
where is node v ’s representation after k rounds of message passing, is the edge connecting it to neighbour u , and and are learned functions — the same general operation GNoME’s crystal-graph network applies to atoms and bonds, applied here to points on a sphere and the physical processes connecting them.
The passage around this formula
where is node v ’s representation after k rounds of message passing, is the edge connecting it to neighbour u , and and are learned functions — the same general operation GNoME’s crystal-graph network applies to atoms and bonds, applied here to points on a sphere and the physical processes connecting them. GraphCast predicts five surface variables and six atmospheric variables across thirty-seven pressure levels, ten days ahead, at six-hour steps [ 5 ] .
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.
Open the illustrated variables: a letter stands for a value guide →
See this notation across published equations →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.