examples/research_projects/lxmert/modeling_frcnn.py/Backbone/size_divisibility
class Backbone:    def size_divisibility(self):
        """
        Some backbones require the input height and width to be divisible by a specific integer. This is
        typically true for encoder / decoder type networks with lateral connection (e.g., FPN) for which feature maps need to match
        dimension in the "bottom up" and "top down" paths. Set to 0 if no specific input size divisibility is required.
        """
        return 0