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. 2021 Jun 11;12:645899. doi: 10.3389/fpls.2021.645899

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Copyright © 2021 Wang, Qin and Cui.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comparison of different feature fusion layer (A) FPN introduces a top-down pathway to fuse multi-scale features from level 3 to7 (P3-P7). (B) PANet adds bottom-up pathway on top of FPN. (C) BiFPN with better and efficiency trade-offs.