How to transform Expression Graphs to Functions using theano?

This recipe helps you to transform Expression Graphs to Functions using theano.

Recipe Objective - How to transform Expression Graphs to Functions using theano?

The function(), commonly accessed as theano.function, the interface for compiling graphs into callable objects.

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Example -

# Import libraries
import theano
from theano import tensor

# Creating a scalar
x = tensor.dscalar()

# Creating graph expression
y = (4*x**2)

# Converting expression into function which takes 'x' as input and return output
fun = theano.function([x],y)

# Calling function
fun(3)

Output -
array(36.)

In this way, we can compile the symbolic graph (4*x^2) into a function that can be called on a number using theano.

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