Fix handling of bias column vectors when K=0 #526
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The column vector was being incorrectly broadcast as if it were a row vector.
This went unnoticed for two reasons:
1. The test was missing a check for equality between actual and expected
results.
2. The M and N sizes were the same in the only test where K=0, so no
broadcast error occurred.
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In a matmul where K=0, bias column vectors were being incorrectly broadcast as if they were a row vector. This went unnoticed for two reasons: