tf.keras.backend.foldr( fn, elems, initializer=None, name=None )
Reduce elems using fn to combine them from right to left.
fn: Callable that will be called upon each element in elems and an accumulator, for instance
lambda acc, x: acc + x
initializer: The first value used (
elems[-1]in case of None)
name: A string name for the foldr node in the graph
Same type and shape as initializer