  The availability of large amounts of data and the necessity to process it
efficiently have led to rapid development of machine learning techniques. To
name a few examples, artificial neural network architectures are commonly used
for financial forecasting, speech and image recognition, robotics, medicine,
and even research. Direct hardware for neural networks is highly sought for
overcoming the von Neumann bottleneck of software implementations. Reservoir
computing (RC) is a recent and increasingly popular bio-inspired computing
scheme which holds promise for an efficient temporal information processing. We
demonstrate the applicability and performance of reservoir computing in a
general complex Ginzburg-Landau lattice model, which adequately describes
dynamics of a wide class of systems, including coherent photonic devices. In
particular, we propose that the concept can be readily applied in
exciton-polariton lattices, which are characterized by unprecedented photonic
nonlinearity, opening the way to signal processing at rates of the order of 1
Tbit (1/s).
