human
Solve the following python programming problem given the following code:
def _hash(self, regularizers = ()) : 
    'Construct a string key for representing a computation graph.

        This key will be unique for a given (a) network topology, (b) set of
        losses, and (c) set of regularizers.

        Returns
        -------
        key : str
            A hash representing the computation graph for the current network.
        ' 
    def add(s) : 
        h.update (str (s).encode ('utf-8')) 
h = hashlib.md5 () 
    for l in self.layers : 
        add ('{}{}{}'.format (l.__class__.__name__, l.name, self.size)) 
for l in self.losses : 
        add ('{}{}'.format (l.__class__.__name__, l.weight)) 
for r in regularizers : 
        add ('{}{}{}'.format (r.__class__.__name__, r.weight, r.pattern)) 
return h.hexdigest () 

    
    

    Fix the buggy line: add ('{}{}{}'.format (l.__class__.__name__, l.name, self.size))
assistant
#Here is Python code to fix the buggy line: add ('{}{}{}'.

add ('{}{}{}'.format (l.__class__.__name__, l.name, l.size))