tf.contrib.distributions.InverseGammaWithSoftplusAlphaBeta.mean()

tf.contrib.distributions.InverseGammaWithSoftplusAlphaBeta.mean(name='mean')

Mean.

Additional documentation from InverseGamma:

The mean of an inverse gamma distribution is beta / (alpha - 1), when alpha > 1, and NaN otherwise. If self.allow_nan_stats is False, an exception will be raised rather than returning NaN