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Block sparse mask attends to non-neighbor blocks · case 03

Block sparse mask attends to non-neighbor blocks.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Positions have block IDs; causal pair visible iff absolute block ID difference<=block_radius.

Why this case matters

A small explicit visibility matrix makes sequence-attention boundary behavior reviewable.

One recorded failure

Sample boundary fixture

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

Boundary fixtureActualExpectedOutcome
block radius[[true, true, false, false, false, false, false], [true, true, false, false, false, false, false], [true, true, true, true, false, false, false], [true, true, true, true, false, false, false], [true, true, true, true, true, true, false], [true, true, true, true, true, true, false], [true, true, true, true, true, true, true]][[true, false, false, false, false, false, false], [true, true, false, false, false, false, false], [true, true, true, false, false, false, false], [true, true, true, true, false, false, false], [false, false, true, true, true, false, false], [false, false, true, true, true, true, false], [false, false, false, false, true, true, true]]Failed

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