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nihui
37 lines
757 B
Markdown
37 lines
757 B
Markdown
### 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|
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|---|---|---|---|
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|1|[1]|scalar|[1]|
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|2|[1]|[1]|[1]|
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|3|[1]|[2,3]|[2,3]|
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|4|[1]|[2,3,4]|[2,3,4]|
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|5|[2]|scalar|[2]|
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|6|[2]|[1]|[2]|
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|7|[2]|[2]|[2]|
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|8|[3]|[2,3]|[2,3]|
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|9|[4]|[2,3,4]|[2,3,4]|
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|10|[2,3]|scalar|[2,3]|
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|11|[2,3]|[1]|[2,3]|
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|12|[2,3]|[3]|[2,3]|
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|13|[2,3]|[2,3]|[2,3]|
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|14|[3,4]|[2,3,4]|[2,3,4]|
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|15|[2,3,4]|scalar|[2,3,4]|
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|16|[2,3,4]|[1]|[2,3,4]|
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|17|[2,3,4]|[4]|[2,3,4]|
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|18|[2,3,4]|[3,4]|[2,3,4]|
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|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|
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|---|---|---|---|
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|1|[2,3,4]|[1,1,4]|[2,3,4]|
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|2|[2,3,4]|[2,3,1]|[2,3,4]|
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