  In this paper, a performance evaluation of well-known deep learning models in
gait recognition is presented. For this purpose, the transfer learning scheme
is adopted to pre-trained models in order to fit the models to the CASIA-B
dataset for solving a gait recognition task. In this context, 18 popular
Convolutional Neural Networks (CNNs), were re-trained using Gait Energy Images
(GEIs) of CASIA-B containing almost 14000 images of 124 classes under various
conditions, and their performance was studied in terms of accuracy. Moreover,
the performance of the studied models is managed to be explained by examining
the parts of the images being considered by the models towards providing their
decisions. The experimental results are very promising since almost all the
models achieved a high accuracy of over 90%, which is robust to the increasing
number of classes. Furthermore, an important outcome of this study is the fact
that a recognition problem can be effectively solved by using CNNs pre-trained
to different problems, thus eliminating the need for customized model design.
