World.dim_c parameter meaning

[njfdiem]

I'm trying to figure out what the World.dim_c paramter does, does anyone know?

It is defined in core.py here:

# multi-agent world
class World(object):
    def __init__(self):
        # list of agents and entities (can change at execution-time!)
        self.agents = []
        self.landmarks = []
        # communication channel dimensionality
        self.dim_c = 0