def fn(x):
arg = array_ops.zeros([], dtype) # pylint: disable=cell-var-from-loop
reducer = kahan_sum_reducer.get_concrete_function(
(arg, arg), (arg, arg))
return xla.variadic_reduce((x, array_ops.zeros_like(x)),
init_value=(arg, arg),
dimensions_to_reduce=dims,
reducer=reducer)[output_idx]
def reduce(*values, dimensions_to_reduce):
return xla.variadic_reduce(
values,
(
init_val_1, # pylint: disable=cell-var-from-loop
init_val_2, # pylint: disable=cell-var-from-loop
),
dimensions_to_reduce=dimensions_to_reduce,
reducer=reducer_func) # pylint: disable=cell-var-from-loop
def reduce(values, *, dimensions_to_reduce):
if is_v2:
return xla.variadic_reduce(
(values, ),
(init_val, ), # pylint: disable=cell-var-from-loop
dimensions_to_reduce=dimensions_to_reduce,
reducer=reducer_func)[0] # pylint: disable=cell-var-from-loop
else:
return gen_xla_ops.xla_variadic_reduce(
(values, ),
(init_val, ), # pylint: disable=cell-var-from-loop
dimensions_to_reduce=dimensions_to_reduce,
reducer=reducer_func)[0] # pylint: disable=cell-var-from-loop
def _xla_reduce(operands, inits, axis):
"""JIT-ed wrapper for TF `xla.variadic_reduce(..., reducer)`."""
from tensorflow.compiler.tf2xla.python import xla # pylint: disable=g-direct-tensorflow-import,g-import-not-at-top
result = xla.variadic_reduce(
operands,
init_values=inits,
dimensions_to_reduce=axis,
reducer=tf.function(reducer).get_concrete_function(inits, inits))
# Graph mode: variadic reduce doesn't specify output shapes. Patch that.
shp = operands[0].shape
for arg in operands:
shp = tensorshape_util.merge_with(shp, arg.shape)
for part in result:
tensorshape_util.set_shape(
part, tuple(dim for i, dim in enumerate(shp) if i not in axis))
return result
def reduce_with_shapes(shape1,
shape2,
shape3,
dimensions_to_reduce=(1, )):
inputs = (array_ops.placeholder(np.float32, shape=shape1),
array_ops.placeholder(np.int32, shape=shape2),
array_ops.placeholder(np.int32, shape=shape3))
init_values = (array_ops.placeholder(np.float32, shape=()),
array_ops.placeholder(np.int32, shape=()),
array_ops.placeholder(np.int32, shape=()))
return xla.variadic_reduce(
inputs,
init_values,
dimensions_to_reduce=dimensions_to_reduce,
reducer=reducer_func)
def testVariadicReduceV2SingleArg(self):
@def_function.function
def reducer_add(op_element, acc_val):
return (op_element + acc_val, )
dtype = np.float32
arg_spec = array_ops.zeros([], dtype) # pylint: disable=cell-var-from-loop
reducer_func = reducer_add.get_concrete_function(arg_spec, arg_spec)
res = xla.variadic_reduce(
(array_ops.placeholder(np.float32, shape=(3, 4, 5)), ),
(array_ops.placeholder(np.float32, shape=()), ),
dimensions_to_reduce=(1, ),
reducer=reducer_func)
self.assertLen(res, 1)
self.assertEqual(res[0].shape, tensor_shape.TensorShape([3, 5]))
