Hi! The problem here is that you're trying to train a syntactic dependency parser on data collected on entity relationships. These are fundamentally two very different tasks so it's not surprising you're seeing a 0 accuracy score here. The dependency parser just isn't the right fit for this task.
spaCy doesn't currently have a generic built-in relation prediction component because the type of model you want for this can often differ significantly between use cases. But this tutorial of implementing an entity relation component might be a good place to start:
