Layer name

Output size

101-layer

Conv1

112 × 112

7 × 7, 64, stride = 2

Conv2_x

56 × 56

3 × 3 max pool, stride = 2

$\left[\begin{array}{l}1\times 1,64\\ 3\times 3,64\\ 1\times 1,256\end{array}\right]\times 3$

Conv3_x

28 × 28

$\left[\begin{array}{l}1\times 1,128\\ 3\times 3,128\\ 1\times 1,512\end{array}\right]\times 4$

Conv4_x

14 × 14

$\left[\begin{array}{l}1\times 1,256\\ 3\times 3,256\\ 1\times 1,1024\end{array}\right]\times 23$

Conv5_x

7 × 7

$\left[\begin{array}{l}1\times 1,512\\ 3\times 3,512\\ 1\times 1,2048\end{array}\right]\times 3$