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* Fix validation tolerance: use relative error instead of absolute The validation was using absolute error tolerance (1e-8) which fails for large matrix multiplication results (magnitude ~1e4). This caused false negatives where COSMA computed correct results but failed validation. Changes: - Switch from absolute error to relative error for validation - Use 1e-5 tolerance for float32 (appropriate for single precision) - Use 1e-8 tolerance for float64 (appropriate for double precision) - Handle small values near zero with absolute error fallback This fixes issue #153 where K-split strategy was incorrectly reported as producing 93.6% errors when actual relative errors were < 1e-6. Tested with: - 32x896x896 float32: now passes (was 93.8% false errors) - 32x10000x896 float32: now passes (was 93.6% false errors) - 32x32x32 float64: still passes (regression test) * format --------- Co-authored-by: David Sanftenberg <david.sanftenberg@gmail.com>
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Ref #158
Accept unitialized matrix C for case beta==0, fill with zeros on entry to call to
multiplyNeed to wait for a new release of COSTA, with a routine to fill matrix with given value.