Anchor free series network yolox source code line by line explanation Part 2 (a total of 10, ensure to explain line by line, after reading, you can change the network at will, not just as a participan

The whole series includes ：Demo Explain the source code line by line ->train The script source code is explained line by line ->backbone Explain the source code line by line ->FPN Explain the source code line by line ->Head Explain the source code line by line ->loss Explain the source code line by line -> The source code of data loading is explained line by line -> The source code of data enhancement is explained line by line ->simOTA Explain the source code line by line . Ensure line by line , Note that line by line , Include python grammar ,tensor Role and application of dimension and line by line code . In fact, there is no mystery about the network structure , It's a stack of modules , There is no reason why you can modify any module . After reading this series, I can do anything about any network structure at will , It's not just limited to one caller .

This article is about YOLOX Middle class PAFPN The construction of the structure , Before that, you must read an article , Otherwise, there will be many articles in this one that cannot be understood .

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Above, YOLOX Of FPN Implementation diagram of structure , The yellow font is the intermediate variable in the code , Easy to understand . Dimension is when yolox_s Network is the output characteristic dimension of the whole network . Start by opening yolox\models\yolo_pafpn.py. Whole FPN The official implementation process of is only the following code , It can be said that it is very simple . Simple statements will be directly annotated ：