in maddpg/common/distributions.py [0:0]
def entropy(self):
a0 = self.logits - U.max(self.logits, axis=1, keepdims=True)
ea0 = tf.exp(a0)
z0 = U.sum(ea0, axis=1, keepdims=True)
p0 = ea0 / z0
return U.sum(p0 * (tf.log(z0) - a0), axis=1)