  Designing complex architectures has been an essential cogwheel in the
revolution deep learning has brought about in the past decade. When solving
difficult problems in a datadriven manner, a well-tried approach is to take an
architecture discovered by renowned deep learning scientists as a basis (e.g.
Inception) and try to apply it to a specific problem. This might be sufficient,
but as of now, achieving very high accuracy on a complex or yet unsolved task
requires the knowledge of highly-trained deep learning experts. In this work,
we would like to contribute to the area of Automated Machine Learning (AutoML),
specifically Neural Architecture Search (NAS), which intends to make deep
learning methods available for a wider range of society by designing neural
topologies automatically. Although several different approaches exist (e.g.
gradient-based or evolutionary algorithms), our focus is on one of the most
promising research directions, reinforcement learning. In this scenario, a
recurrent neural network (controller) is trained to create problem-specific
neural network architectures (child). The validation accuracies of the child
networks serve as a reward signal for training the controller with
reinforcement learning. The basis of our proposed work is Efficient Neural
Architecture Search (ENAS), where parameter sharing is applied among the child
networks. ENAS, like many other RL-based algorithms, emphasize the learning of
child networks as increasing their convergence result in a denser reward signal
for the controller, therefore significantly reducing training times. The
controller was originally trained with REINFORCE. In our research, we propose
to modify this to a more modern and complex algorithm, PPO, which has
demonstrated to be faster and more stable in other environments. Then, we
briefly discuss and evaluate our results.
