theano - print value of TensorVariable

Question

How can I print the numerical value of a theano TensorVariable? I\'m new to theano, so please be patient :)

I have a function where I get y

Answer 1

If y is a theano variable, y.shape will be a theano variable. so it is normal that

print y.shape

return:

Shape.0

If you want to evaluate the expression y.shape, you can do:

y.shape.eval()

if y.shape do not input to compute itself(it depend only on shared variable and constant). Otherwise, if y depend on the x Theano variable you can pass the inputs value like this:

y.shape.eval(x=numpy.random.rand(...))

this is the same thing for the sum. Theano graph are symbolic variable that do not do computation until you compile it with theano.function or call eval() on them.

EDIT: Per the docs, the syntax in newer versions of theano is

y.shape.eval({x: numpy.random.rand(...)})