How to set a default value for an argument in theano?

This recipe helps you to set a default value for an argument in theano.

Recipe Objective - How to set a default value for an argument in theano?

Let’s say you want to define a function that multiplies two numbers, except that if you only provide one number, the other input is assumed to be two. Let's see how can we do this:

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Example -

# Import libraries
import theano
from theano import tensor
from theano.compile.io import In

# Creating two scalars as 'a' and 'b'
a, b = tensor.dscalars('a', 'b')

# Creating expression for multiplication
c = a * b

# Creating function with setting default value of b as 2
fun = theano.function([a, In(b, value=2)], c)

# Calling function with only one value
print('Calling function with one value => ',fun(2))

# Calling function with only two values
print('Calling function with two values => ',fun(2,3))

Output -
Calling function with one value =>  4.0
Calling function with two values =>  6.0

In this way, we can set a default value for an argument in theano.

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