In [1]:

    

import keras.backend as K


    

    




Using TensorFlow backend.

In [2]:

    

'TensorFlow version: ' + K.tf.__version__


    

    
Out[2]:





'TensorFlow version: 1.4.0'

In [3]:

    

K.eval(K.concatenate([K.random_uniform(shape=(3, 4)),
                      K.random_uniform(shape=(3, 4))], axis=0)).shape


    

    
Out[3]:





(6, 4)

In [4]:

    

K.eval(K.concatenate([K.random_uniform(shape=(3, 4)),
                      K.random_uniform(shape=(3, 4))], axis=1)).shape


    

    
Out[4]:





(3, 8)

In [5]:

    

K.eval(K.stack([K.random_uniform(shape=(3, 4)),
                K.random_uniform(shape=(3, 4))], axis=0)).shape


    

    
Out[5]:





(2, 3, 4)

In [6]:

    

K.eval(K.stack([K.random_uniform(shape=(3, 4)),
                K.random_uniform(shape=(3, 4))], axis=1)).shape


    

    
Out[6]:





(3, 2, 4)

In [7]:

    

K.eval(K.stack([K.random_uniform(shape=(3, 4)),
                K.random_uniform(shape=(3, 4))], axis=2)).shape


    

    
Out[7]:





(3, 4, 2)