Weight-stationary (WS)
Beginner
A way of running a grid of calculators where each cell keeps one weight and the inputs flow past it.
Novice
A dataflow in which each processing element holds one weight for a long time while activations stream past it and partial sums move between PEs. Each weight is read from memory once and reused for every input row.
Expert
Maximizes weight reuse in the PE; partial sums travel through the array to accumulators outside it. Loading a new weight tile costs cycles without compute unless it is double-buffered. Used in TPU matrix units.
Explained in Systolic arrays (Architectures).
See also: Output-stationary (OS), Row-stationary (RS).