def test_without_state_raises_if_state_used_on_apply(self):
f = lambda: base.set_state("~", 1)
f = transform.without_state(transform.transform_with_state(f))
rng = jax.random.PRNGKey(42)
with self.assertRaisesRegex(ValueError, "use.*transform_with_state"):
params = f.init(rng)
f.apply(params, rng)
def test_without_state(self):
def f():
w = base.get_parameter("w", [], init=jnp.zeros)
return w
init_fn, apply_fn = transform.without_state(
transform.transform_with_state(f))
params = init_fn(None)
out = apply_fn(params, None)
self.assertEqual(out, 0)
def test_without_state_raises_if_state_used(self):
def f():
for _ in range(10):
count = base.get_state("count", (), jnp.int32, jnp.zeros)
base.set_state("count", count + 1)
return count
init_fn, _ = transform.without_state(transform.transform_with_state(f))
with self.assertRaisesRegex(ValueError, "use.*transform_with_state"):
init_fn(None)
def test_without_state_raises_if_state_used(self):
init_fn, _ = transform.without_state(
transform.transform_with_state(lambda: CountingModule()())) # pylint: disable=unnecessary-lambda
with self.assertRaisesRegex(ValueError, "use.*transform_with_state"):
init_fn(None)
def test_without_state(self):
init_fn, apply_fn = transform.without_state(
transform.transform_with_state(lambda: ScalarModule()())) # pylint: disable=unnecessary-lambda
params = init_fn(None)
out = apply_fn(params, None)
self.assertEqual(out, 0)
class TransformTest(parameterized.TestCase):
@test_utils.transform_and_run
def test_parameter_reuse(self):
w1 = base.get_parameter("w", [], init=jnp.zeros)
w2 = base.get_parameter("w", [], init=jnp.zeros)
self.assertIs(w1, w2)
def test_params(self):
def f():
w = base.get_parameter("w", [], init=jnp.zeros)
return w
init_fn, _ = transform.transform(f)
params = init_fn(None)
self.assertEqual(params, {"~": {"w": jnp.zeros([])}})
@test_utils.transform_and_run
def test_naked_get_parameter(self):
w1 = base.get_parameter("w", [], init=jnp.zeros)
w2 = base.get_parameter("w", [], init=jnp.zeros)
self.assertIs(w1, w2)
def test_naked_parameter_in_tilde_collection(self):
def net():
w1 = base.get_parameter("w1", [], init=jnp.zeros)
w2 = base.get_parameter("w2", [], init=jnp.ones)
self.assertIsNot(w1, w2)
init_fn, _ = transform.transform(net)
params = init_fn(None)
self.assertEqual(params,
{"~": {
"w1": jnp.zeros([]),
"w2": jnp.ones([])
}})
@parameterized.parameters((None, ), ({}, ), ({"~": {}}, ))
def test_parameter_in_apply(self, params):
_, apply_fn = transform.transform(
lambda: base.get_parameter("w", [], init=jnp.zeros))
with self.assertRaisesRegex(
ValueError, "parameters must be created as part of `init`"):
apply_fn(params, None)
@test_utils.transform_and_run(seed=None)
def test_no_rng(self):
with self.assertRaisesRegex(ValueError,
"must pass a non-None PRNGKey"):
base.next_rng_key()
def test_invalid_rng(self):
f = transform.transform(lambda: None)
with self.assertRaisesRegex(
ValueError,
"Init must be called with an RNG as the first argument"):
f.init("nonsense")
with self.assertRaisesRegex(
ValueError,
"Apply must be called with an RNG as the second argument"):
f.apply({}, "nonsense")
def test_invalid_rng_state(self):
f = transform.transform_with_state(lambda: None)
with self.assertRaisesRegex(
ValueError,
"Init must be called with an RNG as the first argument"):
f.init("nonsense")
with self.assertRaisesRegex(
ValueError,
"Apply must be called with an RNG as the third argument"):
f.apply({}, {"x": {}}, "nonsense")
@parameterized.parameters(transform.transform,
transform.transform_with_state)
def test_invalid_rng_none_ignored(self, transform_fn):
f = transform_fn(lambda: None)
args = f.init(None)
if not isinstance(args, tuple):
args = (args, )
f.apply(*args, None)
def test_invalid_params(self):
f = transform.transform_with_state(lambda: None)
with self.assertRaisesRegex(TypeError,
"params argument does not appear valid"):
f.apply("z", {}, None)
def test_invalid_state(self):
f = transform.transform_with_state(lambda: None)
with self.assertRaisesRegex(TypeError,
"state argument does not appear valid"):
f.apply({}, "z", None)
def test_maybe_rng_no_transform(self):
with self.assertRaisesRegex(
ValueError, "must be used as part of an `hk.transform`"):
base.maybe_next_rng_key()
@test_utils.transform_and_run(seed=None)
def test_maybe_no_rng(self):
self.assertIsNone(base.maybe_next_rng_key())
def test_maybe_rng_vs_not(self):
"""If we have an rng, then next_rng_key() == maybe_next_rng_key()."""
rngs = []
maybes = []
@test_utils.transform_and_run
def three():
for _ in range(3):
rngs.append(base.next_rng_key())
@test_utils.transform_and_run
def maybe_three():
for _ in range(3):
maybes.append(base.maybe_next_rng_key())
three()
maybe_three()
self.assertLen(rngs, 6)
self.assertTrue(jnp.all(jnp.array(rngs) == jnp.array(maybes)))
def test_init_custom_creator(self):
def zeros_creator(next_creator, shape, dtype, init, context):
self.assertEqual(context.full_name, "~/w")
self.assertEqual(shape, [])
self.assertEqual(dtype, jnp.float32)
self.assertEqual(init, jnp.ones)
return next_creator(shape, dtype, jnp.zeros)
def f():
with base.custom_creator(zeros_creator):
return base.get_parameter("w", [], init=jnp.ones)
params = transform.transform(f).init(None)
self.assertEqual(params, {"~": {"w": jnp.zeros([])}})
def test_not_triggered_in_apply(self):
log = []
def counting_creator(next_creator, shape, dtype, init, context):
log.append(context.full_name)
return next_creator(shape, dtype, init)
def net():
with base.custom_creator(counting_creator):
for i in range(4):
base.get_parameter("w{}".format(i), [], init=jnp.zeros)
init_fn, apply_fn = transform.transform(net)
params = init_fn(None)
self.assertEqual(log, ["~/w0", "~/w1", "~/w2", "~/w3"])
del log[:]
apply_fn(params, None)
self.assertEmpty(log)
def test_nested_creators(self):
log = []
def logging_creator(log_msg):
def _logging_creator(next_creator, shape, dtype, init, context):
del context
log.append(log_msg)
return next_creator(shape, dtype, init)
return _logging_creator
def f():
a, b, c = map(logging_creator, ["a", "b", "c"])
with base.custom_creator(a), \
base.custom_creator(b), \
base.custom_creator(c):
return base.get_parameter("w", [], init=jnp.ones)
transform.transform(f).init(None)
self.assertEqual(log, ["a", "b", "c"])
def test_argspec(self):
init_fn, apply_fn = transform.transform_with_state(lambda: None)
init_fn_spec = inspect.getfullargspec(init_fn)
apply_fn_spec = inspect.getfullargspec(apply_fn)
self.assertEqual(init_fn_spec.args, ["rng"])
self.assertEqual(apply_fn_spec.args, ["params", "state", "rng"])
def test_get_state_no_init_raises(self):
init_fn, apply_fn = transform.transform_with_state(
lambda: base.get_state("i"))
with self.assertRaisesRegex(ValueError, "set an init function"):
init_fn(None)
state = params = {"~": {}}
with self.assertRaisesRegex(ValueError, "set an init function"):
apply_fn(params, state, None)
def test_get_state_no_shape_raises(self):
init_fn, apply_fn = transform.transform_with_state(
lambda: base.get_state("i", init=jnp.zeros))
with self.assertRaisesRegex(ValueError, "provide shape and dtype"):
init_fn(None)
state = params = {"~": {}}
with self.assertRaisesRegex(ValueError, "provide shape and dtype"):
apply_fn(params, state, None)
def test_get_state_no_init(self):
_, apply_fn = transform.transform_with_state(
lambda: base.get_state("i"))
for i in range(10):
state_in = {"~": {"i": i}}
_, state_out = apply_fn({}, state_in, None)
self.assertEqual(state_in, state_out)
def test_set_then_get(self):
def net():
base.set_state("i", 1)
return base.get_state("i")
init_fn, apply_fn = transform.transform_with_state(net)
params, state = init_fn(None)
self.assertEqual(state, {"~": {"i": 1}})
for i in range(10):
state_in = {"~": {"i": i}}
y, state_out = apply_fn(params, state_in, None)
self.assertEqual(y, 1)
self.assertEqual(state_out, {"~": {"i": 1}})
def test_stateful(self):
def f():
for _ in range(10):
count = base.get_state("count", (), jnp.int32, jnp.zeros)
base.set_state("count", count + 1)
return count
init_fn, apply_fn = transform.transform_with_state(f)
params, state = init_fn(None)
self.assertEqual(state, {"~": {"count": 0}})
_, state = apply_fn(params, state, None)
self.assertEqual(state, {"~": {"count": 10}})
def test_without_state(self):
def f():
w = base.get_parameter("w", [], init=jnp.zeros)
return w
init_fn, apply_fn = transform.without_state(
transform.transform_with_state(f))
params = init_fn(None)
out = apply_fn(params, None)
self.assertEqual(out, 0)
def test_without_state_raises_if_state_used(self):
def f():
for _ in range(10):
count = base.get_state("count", (), jnp.int32, jnp.zeros)
base.set_state("count", count + 1)
return count
init_fn, _ = transform.without_state(transform.transform_with_state(f))
with self.assertRaisesRegex(ValueError, "use.*transform_with_state"):
init_fn(None)
def test_inline_use(self):
def f():
w = base.get_parameter("w", [], init=jnp.zeros)
return w
f = transform.transform(f)
rng = jax.random.PRNGKey(42)
params = f.init(rng)
w = f.apply(params, None)
self.assertEqual(w, 0)
def test_method(self):
obj = ObjectWithTransform()
x = jnp.ones([])
params = obj.forward.init(None, x)
obj_out, y = obj.forward.apply(params, None, x)
self.assertEqual(y, 1)
self.assertIs(obj, obj_out)
params = jax.tree_map(lambda v: v + 1, params)
obj_out, y = obj.forward.apply(params, None, x)
self.assertEqual(y, 2)
self.assertIs(obj, obj_out)
def test_trampoline(self):
obj = ObjectWithTransform()
x = jnp.ones([])
params = obj.trampoline.init(None, x)
obj_out, y = obj.trampoline.apply(params, None, x)
self.assertEqual(y, 1)
self.assertIs(obj, obj_out)
@parameterized.parameters((42, True), (42, False), (28, True), (28, False))
def test_prng_sequence(self, seed, wrap_seed):
# Values using our sequence.
key_or_seed = jax.random.PRNGKey(seed) if wrap_seed else seed
key_seq = base.PRNGSequence(key_or_seed)
seq_v1 = jax.random.normal(next(key_seq), [])
seq_v2 = jax.random.normal(next(key_seq), [])
# Generate values using manual splitting.
key = jax.random.PRNGKey(seed)
key, temp_key = jax.random.split(key)
raw_v1 = jax.random.normal(temp_key, [])
_, temp_key = jax.random.split(key)
raw_v2 = jax.random.normal(temp_key, [])
self.assertEqual(raw_v1, seq_v1)
self.assertEqual(raw_v2, seq_v2)
def test_prng_sequence_invalid_input(self):
with self.assertRaisesRegex(ValueError, "not a JAX PRNGKey"):
base.PRNGSequence("nonsense")
def test_prng_sequence_wrong_shape(self):
with self.assertRaisesRegex(
ValueError, "key did not have expected shape and/or dtype"):
base.PRNGSequence(jax.random.split(jax.random.PRNGKey(42), 2))
@parameterized.parameters(42, 28)
def test_with_rng(self, seed):
key = jax.random.PRNGKey(seed)
unrelated_key = jax.random.PRNGKey(seed * 2 + 1)
_, next_key = jax.random.split(key)
expected_output = jax.random.uniform(next_key, ())
def without_decorator():
return jax.random.uniform(base.next_rng_key(), ())
without_decorator = transform.transform(without_decorator)
without_decorator_out = without_decorator.apply(None,
unrelated_key).item()
def with_decorator():
with base.with_rng(key):
return jax.random.uniform(base.next_rng_key(), ())
with_decorator = transform.transform(with_decorator)
with_decorator_out = with_decorator.apply(None, unrelated_key).item()
self.assertNotEqual(without_decorator_out, expected_output)
self.assertEqual(with_decorator_out, expected_output)
def test_new_context(self):
with base.new_context() as ctx:
pass
self.assertEmpty(ctx.collect_params())
self.assertEmpty(ctx.collect_initial_state())
self.assertEmpty(ctx.collect_state())
def test_context_copies_input(self):
before = {"~": {"w": jnp.array(1.)}}
with base.new_context(params=before, state=before) as ctx:
base.get_parameter("w", [], init=jnp.ones)
base.set_state("w", jnp.array(2.))
self.assertEqual(ctx.collect_params(), {"~": {"w": jnp.array(1.)}})
self.assertIsNot(ctx.collect_initial_state(), before)
self.assertEqual(ctx.collect_initial_state(), before)
self.assertEqual(ctx.collect_state(), {"~": {"w": jnp.array(2.)}})
self.assertEqual(before, {"~": {"w": jnp.array(1.)}})
def test_without_state_raises_if_state_used_on_apply(self):
f = lambda: base.set_state("~", 1)
f = transform.without_state(transform.transform_with_state(f))
rng = jax.random.PRNGKey(42)
with self.assertRaisesRegex(ValueError, "use.*transform_with_state"):
params = f.init(rng)
f.apply(params, rng)
def test_running_init(self):
l = []
f = transform.transform(lambda: l.append(transform.running_init()))
f.init(None)
f.apply({}, None)
init_value, apply_value = l # pylint: disable=unbalanced-tuple-unpacking
self.assertEqual(init_value, True)
self.assertEqual(apply_value, False)
def test_running_init_outside_transform(self):
with self.assertRaisesRegex(
ValueError, "running_init.*used as part of.*transform"):
transform.running_init()
@parameterized.parameters(
None, transform.without_apply_rng, transform.without_state,
lambda f: transform.without_state(transform.without_apply_rng(f)))
def test_persists_original_fn(self, without):
orig_f = lambda: None
f = transform.transform(orig_f)
if without is not None:
f = without(f)
self.assertIs(transform.get_original_fn(f), orig_f)
self.assertIs(transform.get_original_fn(f.init), orig_f)
self.assertIs(transform.get_original_fn(f.apply), orig_f)
