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- ### broadcasting rule
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- ncnn BinaryOp accepts blobs with different shape
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- C = BinaryOp(A, B)
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- shape notation convention is [w], [w,h], [w,h,c]
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- |type|A|B|C|
- |---|---|---|---|
- |1|[1]|scalar|[1]|
- |2|[1]|[2]|[2]|
- |3|[1]|[2,3]|[2,3]|
- |4|[1]|[2,3,4]|[2,3,4]|
- |5|[2]|scalar|[2]|
- |6|[2]|[1]|[2]|
- |7|[2]|[2]|[2]|
- |8|[3]|[2,3]|[2,3]|
- |9|[4]|[2,3,4]|[2,3,4]|
- |10|[2,3]|scalar|[2,3]|
- |11|[2,3]|[1]|[2,3]|
- |12|[2,3]|[3]|[2,3]|
- |13|[2,3]|[2,3]|[2,3]|
- |14|[3,4]|[2,3,4]|[2,3,4]|
- |15|[2,3,4]|scalar|[2,3,4]|
- |16|[2,3,4]|[1]|[2,3,4]|
- |17|[2,3,4]|[4]|[2,3,4]|
- |18|[2,3,4]|[3,4]|[2,3,4]|
- |19|[2,3,4]|[2,3,4]|[2,3,4]|
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- some special broadcasting rule exists for model compatibility
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- |special type|A|B|C|
- |---|---|---|---|
- |1|[2,3,4]|[1,1,4]|[2,3,4]|
- |2|[2,3,4]|[2,3,1]|[2,3,4]|
- |3|[1,1,4]|[2,3,4]|[2,3,4]|
- |4|[2,3,1]|[2,3,4]|[2,3,4]|
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