What is a typed list in theano?

Recipe Objective - What is a typed list in theano?

In typed list, all elements must have the same Theano type.

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Example -

# Importing libraries
import theano.typed_list

# Creating typedlist
f1 = theano.typed_list.TypedListType(theano.tensor.fvector)()

# Creating a vector
f2 = theano.tensor.fvector()

# Appending 'f1' and 'f2'
f3 = theano.typed_list.append(f1, f2)

# Creating function which takes two vectors 'f1' and 'f2' as input and gives 'f3' as output
fun = theano.function([f1, f2], f3)

# Calling function
fun([[1,2]], [2])


Output -
[array([1., 2.], dtype=float32), array([2.], dtype=float32)]

In this way, we can create a typed list in theano.