tf.keras.backend.get_value

TensorFlow 1 version View source on GitHub

Returns the value of a variable.

Used in the notebooks

Used in the guide

backend.get_value is the compliment of backend.set_value, and provides a generic interface for reading from variables while abstracting away the differences between TensorFlow 1.x and 2.x semantics.

K = tf.keras.backend  # Common keras convention
v = K.variable(1.)
# reassign
K.set_value(v, 2.)
print(K.get_value(v))
2.0
# increment
K.set_value(v, K.get_value(v) + 1)
print(K.get_value(v))
3.0

Variable semantics in TensorFlow 2 are eager execution friendly. The above code is roughly equivalent to:

v = tf.Variable(1.)
v.assign(2.)
print(v.numpy())
2.0
v.assign_add(1.)
print(v.numpy())
3.0

x input variable.

A Numpy array.