human
Solve the following python programming problem given the following code:
def build_activation(act = None) : 
    def compose(a, b) : 
        c = (lambda z : b (a (z))) 
        c.__theanets_name__ = ('%s(%s)' % (b.__theanets_name__, a.__theanets_name__)) 
        return c 
if ('+' in act) : 
        return functools.reduce (compose, (build_activation (a) for a in act.split ('+'))) 
options = { 
        'tanh' : T.tanh, 
        'linear' : (lambda z : z), 
        'logistic' : T.nnet.sigmoid, 
        'sigmoid' : T.nnet.sigmoid, 
        'hard_sigmoid' : T.nnet.hard_sigmoid, 
        'softplus' : T.nnet.softplus, 
        'softmax' : softmax, 
        'theano_softmax' : T.nnet.softmax, 
        'relu' : (lambda z : (z * (z > 0))), 
        'trel' : (lambda z : ((z * (z > 0)) * (z < 1))), 
        'trec' : (lambda z : (z * (z > 1))), 
        'tlin' : (lambda z : (z * (abs (z) > 1))), 
        'rect:max' : (lambda z : T.minimum (1, z)), 
        'rect:min' : (lambda z : T.maximum (0, z)), 
        'norm:dc' : (lambda z : (z.T - z.mean (axis = 1)).T), 
        'norm:max' : (lambda z : (z.T / T.maximum (1e-10, abs (z).max (axis = 1))).T), 
        'norm:std' : (lambda z : (z.T / T.maximum (1e-10, T.std (z, axis = 1))).T), 
} 
    for (k, v) in options.items () : 
        v.__theanets_name__ = k 
try : 
        return options [act] 
except KeyError : 
        raise KeyError (('unknown activation %r' % options)) 

    
    

    Fix the buggy line: raise KeyError (('unknown activation %r' % options))
assistant
#Here is Python program to fix the buggy line: raise KeyError (('unknown activation %r' % options))
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raise KeyError (('unknown activation %r' % act))