  Generative models are undoubtedly a hot topic in Artificial Intelligence,
among which the most common type is Generative Adversarial Networks (GANs).
These architectures let one synthesise artificial datasets by implicitly
modelling the underlying probability distribution of a real-world training
dataset. With the introduction of Conditional GANs and their variants, these
methods were extended to generating samples conditioned on ancillary
information available for each sample within the dataset. From a practical
standpoint, however, one might desire to generate data conditioned on partial
information. That is, only a subset of the ancillary conditioning variables
might be of interest when synthesising data. In this work, we argue that
standard Conditional GANs are not suitable for such a task and propose a new
Adversarial Network architecture and training strategy to deal with the ensuing
problems. Experiments illustrating the value of the proposed approach in digit
and face image synthesis under partial conditioning information are presented,
showing that the proposed method can effectively outperform the standard
approach under these circumstances.
