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| x = tf.constant(3.0) | |
| with tf.GradientTape(persistent=True) as g: | |
| g.watch(x) | |
| y = x * x | |
| z = y * y | |
| dz_dx = g.gradient(z, x) # (4*x^3 at x = 3) | |
| print(dz_dx) | |
| # tf.Tensor(108.0, shape=(), dtype=float32) | |
| dy_dx = g.gradient(y, x) | |
| print(dy_dx) | |
| # tf.Tensor(6.0, shape=(), dtype=float32) |
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