最近,我想用tensorflow重写一些Theano编码。然而,我遇到了一个问题,我不知道如何写Lop运算符在张量流。下图是关于Theano.tensor.Lop的API
以下是序号中的初始编码
def svgd_gradient(X0):
hidden, _, mse = discrim(X0)
grad = -1.0 * T.grad( mse.sum(), X0)
kxy, neighbors, h = rbf_kernel(hidden) #TODO
coff = T.exp( - T.sum((hidden[neighbors] - hidden)**2, axis=1) / h**2 / 2.0 )
v = coff.dimshuffle(0, 'x') * (-hidden[neighbors] + hidden) / h**2
X1 = X0[neighbors]
hidden1, _, _ = discrim(X1)
dxkxy = T.Lop(hidden1, X1, v)
svgd_grad = grad + dxkxy / 2.
return grad, svgd_grad, dxkxy
我试过这种方法,但是维度有问题
def svgd_gradient(self, x0):
hidden, _, mse = self.discriminator(x0)
grad = -tf.gradients(tf.reduce_sum(mse), x0)
kxy,neighbors, h = self.rbd_kernel(hidden)
coff = tf.exp(-tf.reduce_sum((hidden[neighbors] - hidden)**2, axis=1) / h**2 / 2.0)
v = tf.expand_dims(coff, axis=1) * (-hidden[neighbors] + hidden) / h**2
x1 = x0[neighbors]
hidden1, _, _ = self.discriminator(x1, reuse=True)
dxkxy = self.Lop(hidden1, x1, v)
svgd_grad = grad + dxkxy / 2
return grad, svgd_grad, dxkxy
def Lop(self, f, wrt, v):
Lop = tf.multiply(tf.gradients(f, wrt), v)
return Lop
你可以试试
(学分:jhatford)
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