def foldl(fn, elems, initializer=None, name=None):
 return tf.foldl(fn, elems, initializer=initializer, name=name)

def foldl ( fn , elems , initializer = None , name = None ) : return tf . foldl ( fn , elems , initializer = initializer , name = name )
reduce elems using fn to combine them from left to right .