foldl on the list of tensors unpacked from elems on dimension 0.

# Aliases:

• tf.compat.v1.foldl
• tf.compat.v2.foldl

 tf.foldl(
    fn,
    elems,
    initializer=None,
    parallel_iterations=10,
    back_prop=True,
    swap_memory=False,
    name=None
)

This foldl operator repeatedly applies the callable fn to a sequence of elements from first to last. The elements are made of the tensors unpacked from elems on dimension 0. The callable fn takes two tensors as arguments. The first argument is the accumulated value computed from the preceding invocation of fn, and the second is the value at the current position of elems. If initializer is None, elems must contain at least one element, and its first element is used as the initializer. Suppose that elems is unpacked into values, a list of tensors. The shape of the result tensor is fn(initializer, values[0]).shape. This method also allows multi-arityelemsand output offn. Ifelemsis a (possibly nested) list or tuple of tensors, then each of these tensors must have a matching first (unpack) dimension. The signature offnmay match the structure ofelems. That is, ifelemsis (t1, [t2, t3, [t4, t5]]t1, [t2, t3, [t4, t5]]), then an appropriate signature forfnis:fn= lambda (t1, [t2, t3, [t4, t5]]t1, [t2, t3, [t4, t5]]`):.

# Args:

• fn: The callable to be performed.
• elems: A tensor or (possibly nested) sequence of tensors, each of which will be unpacked along their first dimension. The nested sequence of the resulting slices will be the first argument to fn.
• initializer: (optional) A tensor or (possibly nested) sequence of tensors, as the initial value for the accumulator.
• parallel_iterations: (optional) The number of iterations allowed to run in parallel.
• back_prop: (optional) True enables support for back propagation.
• swap_memory: (optional) True enables GPU-CPU memory swapping.
• name: (optional) Name prefix for the returned tensors.

# Returns:

A tensor or (possibly nested) sequence of tensors, resulting from applying fn consecutively to the list of tensors unpacked from elems, from first to last.

# Raises:

• TypeError: if fn is not callable.

# Example:

 elems = tf.constant([1, 2, 3, 4, 5, 6])
sum = foldl(lambda a, x: a + x, elems)
# sum == 21