RuntimeError: element 0 of variables tuple is volatile

autograd
3

I trace it back into the output, but within the model I have this, which is a recurrent unit:

    for i in range(timesteps):
        indices = torch.LongTensor([i])
        #ids = torch.LongTensor([1]).cuda()
        pyramidal1, self.state = self.unit(torch.squeeze(x[:,i,...], 1), self.state)
        print(pyramidal1.volatile)
        print("Timesteps: ", i)

The interesting thing is that it becomes volatile in the second timestep, so is there something wrong about the way I am handling the data?