Temperature setting in CAT-VAE model

[dailingjun]

The temperature in the CAT-VAE model is set in this way：

    if batch_idx % self.anneal_interval == 0 and self.training:
        self.temp = np.maximum(self.temp * np.exp(- self.anneal_rate * batch_idx),
                               self.min_temp)

'self.temp' is initialized by 0.5.
'self.min_temp' is initialized by 0.5 too.
'self.temp * np.exp(- self.anneal_rate * batch_idx)' is ALWAYS no larger than 'self.min_temp'.
So 'self.temp' is ALWAYS equal to 'self.min_temp', namely 0.5.
Something wrong?