score:2
You can try to do this on TF 2 with eager mode on.
Please notice that you need to use
tf.keras
for everything, including your model, layers, etc. For this to work you can never usekeras
alone, it must betf.keras
. This means, for instance, usingtf.keras.layers.Dense
,tf.keras.models.Sequential
, etc..
input_images_tensor = tf.constant(input_images_numpy)
with tf.GradientTape() as g:
g.watch(input_images_tensor)
output_tensor = model(input_images_tensor)
gradients = g.gradient(output_tensor, input_images_tensor)
If you are going to calculate the gradients more than once with the same tape, you need the tape to be persistent=True
and delete it manually after you get the gradients. (See details on the link below)
You can get the gradients regarding any "trainable" weight without needing watch
. If you are going to get gradients with respect to non-trainable tensors (such as the input images), then you must call g.watch
as above for each of these variables).
More details on GradientTape
: https://www.tensorflow.org/api_docs/python/tf/GradientTape
Credit To: stackoverflow.com
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