Concept

Multi-Output Channel Cross-Correlation Operation

In a multi-output channel cross-correlation, the result for each individual output channel is calculated independently from the other output channels, using its corresponding cextrmiimeskextrmhimeskextrmwc_ extrm{i} imes k_ extrm{h} imes k_ extrm{w} slice from the convolution kernel and the entire multi-channel input tensor. Specifically, the kernel slice performs a multi-channel cross-correlation with all cextrmic_ extrm{i} channels of the input tensor to produce one channel of the output. While the computation for each channel is independent, the multiple output channels do not learn representations independently; rather, they are optimized jointly, meaning specific directions in the channel space may correspond to useful feature detections, such as edge detectors.

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Updated 2026-05-12

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