tf.keras.backend.stack

Stacks a list of rank R tensors into a rank R+1 tensor.

x List of tensors.
axis Axis along which to perform stacking.

A tensor.

Example:

a = tf.constant([[1, 2],[3, 4]])
b = tf.constant([[10, 20],[30, 40]])
tf.keras.backend.stack((a, b))
<tf.Tensor: shape=(2, 2, 2), dtype=int32, numpy=
array([[[ 1,  2],
        [ 3,  4]],
       [[10, 20],
        [30, 40]]], dtype=int32)>