FA-99199 / Checkpoint tensor mapping / Member archive

Checkpoint mapping: two dimensional shard indices use the tile width as row stride · case 04

two dimensional shard indices use the tile width as row stride.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

For a 2D global shape and tile shape, coord is a tile-grid [row,column] coordinate. Return the row-major flat positions occupied by the tile, or [] if dimensions are negative or the whole tile lies outside the global shape.

Why this case matters

A bounded offline model of checkpoint tensor bookkeeping in a training workflow.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
interior tile	`[6, 7, 8, 9]`	`[14, 15, 20, 21]`	Failed

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