def __init__(self, inputs=(), outputs=()):
""" Inputs and outputs are list of
dict(name='', interface='', value='') """
DataFlow.__init__(self)
self.id_in = None
self.id_out = None
Node.__init__(self, inputs, outputs)
# graph modification status
self.graph_modified = False
self.evaluating = False
self.eval_algo = None
