fix a bug about KL loss term #6
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According to Auto-Encoding Variational Bayes
kl_terms[t]=0.5*tf.reduce_sum(mu2+sigma2-2*logsigma,1)-T*.5should be
0.5*tf.reduce_sum(mu2+sigma2-2*logsigma-1,1)equals to
0.5*tf.reduce_sum(mu2+sigma2-2*logsigma,1)-z_size*.5