What is the fine-grained topic of the following text: Here, we show that convolutional neural networks (CNNs)-a machine learning approach that recently became the leading technique for object recognition, human pose estimation, and human action recognition-were able to recognize directly from images whether Drosophila were "on" (standing or walking) or "off" (not in physical contact with) egg-laying substrates for each frame of our videos. Only return the topic.
Use of Convolutional Neural Networks (CNNs) for recognizing Drosophila behavior in images