tf.keras.backend.cast

TensorFlow 2 version View source on GitHub

Casts a tensor to a different dtype and returns it.

tf.keras.backend.cast(
    x, dtype
)

You can cast a Keras variable but it still returns a Keras tensor.

x Keras tensor (or variable).
dtype String, either ('float16', 'float32', or 'float64').

Keras tensor with dtype dtype.

Examples:

Cast a float32 variable to a float64 tensor

import tensorflow as tf
from tensorflow.keras import backend as K
input = K.ones(shape=(1,3))
print(input)
cast_input = K.cast(input, dtype='float64')
print(cast_input)

<tf.Variable 'Variable:0' shape=(1, 3) dtype=float32,
     numpy=array([[1., 1., 1.]], dtype=float32)>
tf.Tensor([[1. 1. 1.]], shape=(1, 3), dtype=float64)