'Returns the number of people you interacted with (either helped or that have helped you)
:param public_key: The public key of the member of which we want the information
:return: A tuple of unique number of interactors that helped you and that you have helped respectively'

def get_num_unique_interactors(self, public_key):

    peers_you_helped = set()
    peers_helped_you = set()
    for block in self.get_latest_blocks(public_key, limit=(-1)):
        if (int(block.transaction['up']) > 0):
            peers_you_helped.add(block.link_public_key)
        if (int(block.transaction['down']) > 0):
            peers_helped_you.add(block.link_public_key)
    return (len(peers_you_helped), len(peers_helped_you))
