def test_len(self):
self.assertEqual(py_builtins.len_([1, 2, 3]), 3)
with self.test_session() as sess:
t = py_builtins.len_(constant_op.constant([[1], [2], [3]]))
self.assertEqual(t, 3)
ta = py_builtins.len_(tensor_array_ops.TensorArray(dtypes.int32, size=5))
self.assertEqual(sess.run(ta), 5)
tl = py_builtins.len_(data_structures.tf_tensor_list_new([3, 4, 5]))
self.assertEqual(sess.run(tl), 3)
def test_len_dynamic_shape(self):
with self.cached_session() as sess:
p = array_ops.placeholder(dtype=dtypes.int32, shape=None)
t = py_builtins.len_(p)
self.assertEqual(sess.run(t, {p: [1, 2, 3]}), 3)
with self.assertRaises(errors_impl.InvalidArgumentError):
t = py_builtins.len_(p)
sess.run(t, {p: 1})
def test_len(self):
self.assertEqual(py_builtins.len_([1, 2, 3]), 3)
with self.cached_session() as sess:
t = py_builtins.len_(constant_op.constant([[1], [2], [3]]))
self.assertEqual(t, 3)
ta = py_builtins.len_(tensor_array_ops.TensorArray(dtypes.int32, size=5))
self.assertEqual(self.evaluate(ta), 5)
tl = py_builtins.len_(data_structures.tf_tensor_list_new([3, 4, 5]))
self.assertEqual(self.evaluate(tl), 3)
def test_len_dynamic_shape(self):
with self.test_session() as sess:
p = array_ops.placeholder(dtype=dtypes.int32, shape=None)
t = py_builtins.len_(p)
self.assertEqual(sess.run(t, {p: [1, 2, 3]}), 3)
with self.assertRaises(errors_impl.InvalidArgumentError):
t = py_builtins.len_(p)
sess.run(t, {p: 1})
def _known_len_tf_for_stmt(iter_, extra_test, body, init_state):
"""Overload of for_stmt that iterates over objects that admit a length."""
n = py_builtins.len_(iter_)
def while_body(iterate_index, *state):
iterate = iter_[iterate_index]
new_state = body(iterate, *state)
state = (iterate_index + 1,)
if new_state:
state += new_state
return state
def while_cond(iterate_index, *state):
if extra_test is not None:
return gen_math_ops.logical_and(iterate_index < n, extra_test(*state))
return iterate_index < n
results = _tf_while_stmt(
while_cond,
while_body,
init_state=(0,) + init_state,
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
# TODO(mdan): Don't.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
else:
results = ()
return results
def _known_len_for_stmt(iter_, extra_test, body, init_state):
"""Overload of for_stmt that iterates over objects that admit a length."""
n = py_builtins.len_(iter_)
def while_body(iterate_index, *state):
iterate = iter_[iterate_index]
new_state = body(iterate, *state)
return (iterate_index + 1,) + new_state
def while_cond(iterate_index, *state):
return gen_math_ops.logical_and(iterate_index < n, extra_test(*state))
results = while_stmt(
while_cond,
while_body,
init_state=(0,) + init_state,
extra_deps=(iter_,),
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
results = results[1:]
# TODO(mdan): Remove this special case.
if len(results) == 1:
return results[0]
return results
def _known_len_for_stmt(iter_, extra_test, body, init_state):
"""Overload of for_stmt that iterates over objects that admit a length."""
n = py_builtins.len_(iter_)
def while_body(iterate_index, *state):
iterate = iter_[iterate_index]
new_state = body(iterate, *state)
if new_state:
return (iterate_index + 1, ) + new_state
else:
return iterate_index + 1
def while_cond(iterate_index, *state):
return gen_math_ops.logical_and(iterate_index < n, extra_test(*state))
results = while_stmt(while_cond,
while_body,
init_state=(0, ) + init_state,
extra_deps=(iter_, ),
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
# TODO(mdan): Don't.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
if len(results) == 1:
# TODO(mdan): Remove this special case.
results, = results
else:
results = ()
return results
def _known_len_tf_for_stmt(iter_, extra_test, body, get_state, set_state,
init_vars, basic_symbol_names,
composite_symbol_names, opts):
"""Overload of for_stmt that iterates over TF entities that admit a length."""
_disallow_undefs_into_loop(*init_vars)
n = py_builtins.len_(iter_)
# TODO(b/117628877): Revisit performance once XLA has the necessary support.
# Note: using a TensorArray creates an extra copy, but can calculate
# gradients more efficiently than StridedSlice.
ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
iter_ = ta.unstack(iter_)
def while_body(iterate_index, *loop_vars):
"""Main loop body."""
iterate = iter_.read(iterate_index)
new_vars = body(iterate, *loop_vars)
loop_vars = (iterate_index + 1, )
if new_vars:
loop_vars += new_vars
return loop_vars
def while_cond(iterate_index, *loop_vars):
if extra_test is not None:
return control_flow_ops.cond(iterate_index < n,
lambda: extra_test(*loop_vars),
lambda: False)
return iterate_index < n
# TODO(b/134181679): Let the op itself handle optimizations.
if control_flow_util.GraphOrParentsInXlaContext(ops.get_default_graph()):
opts['maximum_iterations'] = n
results = _tf_while_stmt(
while_cond,
while_body,
get_state,
set_state,
(array_ops.zeros_like(n), ) + init_vars,
('<internal iterate>', ) + basic_symbol_names,
composite_symbol_names,
opts,
)
# Note: the iteration index is not returned by the while loop, however
# if a symbol with the same name exists outside the loop, it will be captured
# by the loop variables and ultimately updated correctly.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
else:
results = ()
return results
def test_len_dataset(self):
dataset = dataset_ops.DatasetV2.from_tensor_slices([3, 2, 1])
self.assertEqual(self.evaluate(py_builtins.len_(dataset)), 3)
# graph mode
@def_function.function(autograph=False)
def test_fn():
dataset = dataset_ops.DatasetV2.from_tensor_slices([3, 2, 1])
return py_builtins.len_(dataset)
self.assertEqual(self.evaluate(test_fn()), 3)
def test_len_dataset_infinite(self):
dataset = dataset_ops.DatasetV2.range(5).repeat().batch(2)
with self.assertRaises(errors_impl.InvalidArgumentError):
_ = self.evaluate(py_builtins.len_(dataset))
# graph mode
@def_function.function
def test_fn():
dataset = dataset_ops.DatasetV2.range(5).repeat().batch(2)
return py_builtins.len_(dataset)
with self.assertRaises(errors_impl.InvalidArgumentError):
self.evaluate(test_fn())
def test_len_dataset_unknown(self):
dataset = dataset_ops.DatasetV2.range(5).filter(lambda _: True).batch(2)
with self.assertRaises(errors_impl.InvalidArgumentError):
_ = self.evaluate(py_builtins.len_(dataset))
# graph mode
@def_function.function(autograph=False)
def test_fn():
dataset = dataset_ops.DatasetV2.range(5).filter(lambda _: True).batch(2)
return py_builtins.len_(dataset)
with self.assertRaises(errors_impl.InvalidArgumentError):
self.evaluate(test_fn())
def _known_len_tf_for_stmt(iter_, extra_test, body, get_state, set_state,
symbol_names, opts):
"""Overload of for_stmt that iterates over TF entities that admit a length."""
n = py_builtins.len_(iter_)
# TODO(b/117628877): Revisit performance once XLA has the necessary support.
# Note: using a TensorArray creates an extra copy, but can calculate
# gradients more efficiently than StridedSlice.
ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
iter_ = ta.unstack(iter_)
iterate_index = compat_util.BasicRef(0)
def aug_get_state():
return (iterate_index.value, ) + get_state()
def aug_set_state(aug_loop_vars):
# TOOD(mdan): Use starred assignment once we can switch to Py3-only syntax.
iterate_index.value, loop_vars = aug_loop_vars[0], aug_loop_vars[1:]
# The iteration index is not "output" by the for loop. If the iterate
# is used outside the loop, it will appear in the loop vars separately.
set_state(loop_vars)
def aug_body():
body(iter_.read(iterate_index.value))
iterate_index.value += 1
def aug_test():
main_test = iterate_index.value < n
if extra_test is not None:
return control_flow_ops.cond(main_test, extra_test, lambda: False)
return main_test
# TODO(b/159186914): Remove.
if not control_flow_util.GraphOrParentsInXlaContext(
ops.get_default_graph()):
opts['maximum_iterations'] = n
_tf_while_stmt(
aug_test,
aug_body,
aug_get_state,
aug_set_state,
('<internal iterate>', ) + symbol_names,
opts,
)
def _known_len_tf_for_stmt(iter_, extra_test, body, get_state, set_state,
init_vars):
"""Overload of for_stmt that iterates over TF entities that admit a length."""
_disallow_undefs_into_loop(*init_vars)
n = py_builtins.len_(iter_)
# TODO(b/117628877): Revisit performance once XLA has the necessary support.
# Note: using a TensorArray creates an extra copy, but can calculate
# gradients more efficiently than StridedSlice.
ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
iter_ = ta.unstack(iter_)
def while_body(iterate_index, *loop_vars):
iterate = iter_.read(iterate_index)
new_vars = body(iterate, *loop_vars)
loop_vars = (iterate_index + 1,)
if new_vars:
loop_vars += new_vars
return loop_vars
def while_cond(iterate_index, *loop_vars):
if extra_test is not None:
return control_flow_ops.cond(
iterate_index < n, lambda: extra_test(*loop_vars), lambda: False)
return iterate_index < n
results = _tf_while_stmt(
while_cond,
while_body,
get_state,
set_state,
init_vars=(0,) + init_vars,
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
# TODO(mdan): Don't.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
else:
results = ()
return results
def _known_len_tf_for_stmt(iter_, extra_test, body, init_state):
"""Overload of for_stmt that iterates over TF entities that admit a length."""
_disallow_undefs_into_loop(*init_state)
n = py_builtins.len_(iter_)
# TODO(b/117628877): Revisit performance once XLA has the necessary support.
# Note: using a TensorArray creates an extra copy, but can calculate
# gradients more efficiently than StridedSlice.
ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
iter_ = ta.unstack(iter_)
def while_body(iterate_index, *state):
iterate = iter_.read(iterate_index)
new_state = body(iterate, *state)
state = (iterate_index + 1,)
if new_state:
state += new_state
return state
def while_cond(iterate_index, *state):
if extra_test is not None:
return control_flow_ops.cond(
iterate_index < n,
lambda: extra_test(*state),
lambda: False)
return iterate_index < n
results = _tf_while_stmt(
while_cond,
while_body,
init_state=(0,) + init_state,
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
# TODO(mdan): Don't.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
else:
results = ()
return results
def _known_len_tf_for_stmt(iter_, extra_test, body, get_state, set_state,
symbol_names, opts):
"""Overload of for_stmt that iterates over TF entities that admit a length."""
n = py_builtins.len_(iter_)
# TODO(b/117628877): Revisit performance once XLA has the necessary support.
# Note: using a TensorArray creates an extra copy, but can calculate
# gradients more efficiently than StridedSlice.
ta = tensor_array_ops.TensorArray(iter_.dtype, size=n)
iter_ = ta.unstack(iter_)
iterate_index = 0
def aug_get_state():
return (iterate_index, ) + get_state()
def aug_set_state(aug_loop_vars):
nonlocal iterate_index
# TODO(b/171479293): Drop the lint override.
iterate_index, *loop_vars = aug_loop_vars # pylint:disable=unused-variable
# The iteration index is not "output" by the for loop. If the iterate
# is used outside the loop, it will appear in the loop vars separately.
set_state(loop_vars)
def aug_body():
nonlocal iterate_index
body(iter_.read(iterate_index))
iterate_index += 1
def aug_test():
main_test = iterate_index < n
if extra_test is not None:
return control_flow_ops.cond(main_test, extra_test, lambda: False)
return main_test
_add_max_iterations_hint(opts, n)
_tf_while_stmt(
aug_test,
aug_body,
aug_get_state,
aug_set_state,
('<internal iterate>', ) + symbol_names,
opts,
)
def _known_len_tf_for_stmt(iter_, extra_test, body, init_state):
"""Overload of for_stmt that iterates over objects that admit a length."""
_disallow_undefs_into_loop(*init_state)
n = py_builtins.len_(iter_)
def while_body(iterate_index, *state):
iterate = iter_[iterate_index]
new_state = body(iterate, *state)
state = (iterate_index + 1,)
if new_state:
state += new_state
return state
def while_cond(iterate_index, *state):
if extra_test is not None:
return control_flow_ops.cond(
iterate_index < n,
lambda: extra_test(*state),
lambda: False)
return iterate_index < n
results = _tf_while_stmt(
while_cond,
while_body,
init_state=(0,) + init_state,
opts=dict(maximum_iterations=n))
# Dropping the iteration index because it's not syntactically visible.
# TODO(mdan): Don't.
if isinstance(results, (tuple, list)):
assert len(results) >= 1 # Has at least the iterate.
if len(results) > 1:
results = results[1:]
else:
results = ()
return results
def test_len_scalar(self):
with self.assertRaises(ValueError):
py_builtins.len_(constant_op.constant(1))
def test_len_scalar(self):
with self.assertRaises(ValueError):
py_builtins.len_(constant_op.constant(1))
def test_fn():
dataset = dataset_ops.DatasetV2.range(5).filter(
lambda _: True).batch(2)
return py_builtins.len_(dataset)
def test_fn():
dataset = dataset_ops.DatasetV2.range(5).repeat().batch(2)
return py_builtins.len_(dataset)
def test_fn():
dataset = dataset_ops.DatasetV2.from_tensor_slices([3, 2, 1])
return py_builtins.len_(dataset)
