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2.3.2 训练模式和预测模式有关键性错误 #74

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xinetzone opened this issue Oct 11, 2020 · 0 comments

xinetzone commented Oct 11, 2020

with tf.GradientTape(persistent=True) as g:
    g.watch(x)
    y = x * x
    z = y * y
    dz_dx = g.gradient(z, x)  # 108.0 (4*x^3 at x = 3)
    dy_dx = g.gradient(y, x)  # 6.0
dz_dx,dy_dx

需要改为：

with tf.GradientTape(persistent=True) as g:
    g.watch(x)
    y = x * x
    z = y * y
dz_dx = g.gradient(z, x)  # 108.0 (4*x^3 at x = 3)
dy_dx = g.gradient(y, x)  # 6.0
dz_dx,dy_dx

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