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Sparse tensor: duplicate CSR columns are retained as separate coordinates · case 04

duplicate CSR columns are retained as separate coordinates.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Within each row, sum equal columns, omit zero totals, and return canonical CSR [row_ptr,columns,values].

Why this case matters

A small offline sparse-array operation has explicit coordinate and storage semantics.

One recorded failure

Sample boundary fixture

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

Boundary fixtureActualExpectedOutcome
duplicates[[0, 3], [1, 1, 0], [4, 2, 4]][[0, 2], [0, 1], [4, 6]]Failed

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