tf.keras.backend.ones_like

Instantiates an all-ones variable of the same shape as another tensor.

x Keras variable or tensor.
dtype String, dtype of returned Keras variable. None uses the dtype of x.
name String, name for the variable to create.

A Keras variable with the shape of x filled with ones.

Example:

kvar = tf.keras.backend.variable(np.random.random((2,3)))
kvar_ones = tf.keras.backend.ones_like(kvar)
tf.keras.backend.eval(kvar_ones)
array([[1.,  1.,  1.],
       [1.,  1.,  1.]], dtype=float32)