def parameters(self):
params, grads = [], []
if hasattr(self, 'weight'):
assert hasattr(self, 'grad_weight'), "The layer {} has a `weight` variable but no `grad_weight`, you probably forget to implement it.".format(df.classname(self))
params += [self.weight]
grads += [self.grad_weight]
if hasattr(self, 'bias'):
assert hasattr(self, 'grad_bias'), "The layer {} has a `bias` variable but no `grad_bias`, you probably forget to implement it.".format(df.classname(self))
params += [self.bias]
grads += [self.grad_bias]
return params, grads
