In the EfficientDet paper, section 5.2. 5.2. EfficientDet for Semantic Segmentation, the authors say

we modify our EfficientDet model to keep feature level $\{P2, P3, ..., P7\}$ in BiFPN, but only use $P2$ for the final per-pixel classification

How to use only $P2$ for semantic segmentation purposes in this case?


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