CODEWITHSUNDEEP
tensorflow
Ziofil
Ziofil

Reputation: 2015

Does tensorflow recompute these values?

If I call x,y = sess.run([X,f(X)]), is X computed once or twice? I'm asking because in my case the value of X is not deterministic, and it's necessary that f be evaluated on the same 'instance' of X.

Upvotes: 1

Views: 103

Answers (2)

toto2
toto2

Reputation: 5326

It will only compute it once. It would not make sense if it recomputed the dependent variables. Just about all variables in a tensorflow model are dependent on one another.

Upvotes: 0

Ishant Mrinal
Ishant Mrinal

Reputation: 4918

To make sure that f uses the current X you can set up dependencies. 

with tf.control_dependencies([X]):
    y = f(X)
x, y_ = sess.run([X, y])

Upvotes: 1

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