def test_monto_carlo_objective(self):
log_p, log_q = prepare_test_payload()
obj = monte_carlo_objective(log_p, log_q, axis=[0])
assert_allclose(
T.reduce_mean(obj),
monte_carlo_objective(log_p, log_q, axis=[0], reduction='mean'),
rtol=1e-4, atol=1e-6
)
assert_allclose(
T.reduce_sum(obj),
monte_carlo_objective(log_p, log_q, axis=[0], reduction='sum'),
rtol=1e-4, atol=1e-6
)
obj_shape = T.shape(obj)
assert_allclose(obj, T.log_mean_exp(log_p - log_q, axis=[0]))
obj_k = monte_carlo_objective(log_p, log_q, axis=[0], keepdims=True)
assert_allclose(
T.reduce_mean(obj_k),
monte_carlo_objective(log_p, log_q, axis=[0], keepdims=True, reduction='mean')
)
assert_allclose(
T.reduce_sum(obj_k),
monte_carlo_objective(log_p, log_q, axis=[0], keepdims=True, reduction='sum')
)
self.assertListEqual([1] + obj_shape, T.shape(obj_k))
assert_allclose(
obj_k,
T.log_mean_exp(log_p - log_q, axis=[0], keepdims=True)
)
def test_invertible_matrices(self):
for cls in (LooseInvertibleMatrix, StrictInvertibleMatrix):
for n in [1, 3, 5]:
m = cls(np.random.randn(n, n))
self.assertEqual(repr(m), f'{cls.__qualname__}(size={n})')
self.assertEqual(m.size, n)
m = tk.layers.jit_compile(m)
# check the initial value is an orthogonal matrix
matrix, _ = m(inverse=False, compute_log_det=False)
inv_matrix, _ = m(inverse=True, compute_log_det=False)
assert_allclose(np.eye(n), T.matmul(matrix, inv_matrix),
rtol=1e-4, atol=1e-6)
assert_allclose(np.eye(n), T.matmul(inv_matrix, matrix),
rtol=1e-4, atol=1e-6)
# check the invertibility
check_invertible_matrix(self, m, n)
# check the gradient
matrix, log_det = m(inverse=False, compute_log_det=True)
params = list(tk.layers.iter_parameters(m))
grads = T.grad(
[T.reduce_sum(matrix), T.reduce_sum(log_det)], params)
# update with gradient, then check the invertibility
if cls is StrictInvertibleMatrix:
for param, grad in zip(params, grads):
with T.no_grad():
T.assign(param, param + 0.001 * grad)
check_invertible_matrix(self, m, n)
def test_elbo(self):
log_p, log_q = prepare_test_payload()
obj = elbo_objective(log_p, log_q)
assert_allclose(
T.reduce_mean(obj),
elbo_objective(log_p, log_q, reduction='mean')
)
assert_allclose(
T.reduce_sum(obj),
elbo_objective(log_p, log_q, reduction='sum')
)
obj_shape = T.shape(obj)
assert_allclose(obj, log_p - log_q)
obj_r = elbo_objective(log_p, log_q, axis=[0])
self.assertListEqual(obj_shape[1:], T.shape(obj_r))
assert_allclose(obj_r, T.reduce_mean(log_p - log_q, axis=[0]))
obj_rk = elbo_objective(log_p, log_q, axis=[0], keepdims=True)
assert_allclose(
T.reduce_mean(obj_rk),
elbo_objective(log_p, log_q, axis=[0], keepdims=True, reduction='mean')
)
assert_allclose(
T.reduce_sum(obj_rk),
elbo_objective(log_p, log_q, axis=[0], keepdims=True, reduction='sum')
)
self.assertListEqual([1] + obj_shape[1:], T.shape(obj_rk))
assert_allclose(
obj_rk,
T.reduce_mean(log_p - log_q, axis=[0], keepdims=True)
)
def test_iwae(self):
assert_allclose_ = functools.partial(assert_allclose,
rtol=1e-5,
atol=1e-6)
x, y, z, f, log_f, log_q = prepare_test_payload(reparameterized=True)
wk_hat = f / T.reduce_sum(f, axis=[0], keepdims=True)
cost = iwae_estimator(log_f, axis=[0])
assert_allclose_(-cost, iwae_estimator(log_f, axis=[0], negative=True))
assert_allclose_(T.reduce_mean(cost),
iwae_estimator(log_f, axis=[0], reduction='mean'))
assert_allclose_(T.reduce_sum(cost),
iwae_estimator(log_f, axis=[0], reduction='sum'))
cost_shape = T.shape(cost)
assert_allclose_(
T.grad([T.reduce_sum(cost)], [y])[0],
T.reduce_sum(wk_hat * (2 * x * y), axis=[0]))
x, y, z, f, log_f, log_q = prepare_test_payload(reparameterized=True)
wk_hat = f / T.reduce_sum(f, axis=[0], keepdims=True)
cost_k = iwae_estimator(log_f, axis=[0], keepdims=True)
assert_allclose_(
T.reduce_mean(cost_k),
iwae_estimator(log_f, axis=[0], keepdims=True, reduction='mean'))
assert_allclose_(
T.reduce_sum(cost_k),
iwae_estimator(log_f, axis=[0], keepdims=True, reduction='sum'))
assert_allclose_(
-cost_k,
T.to_numpy(
iwae_estimator(log_f, axis=[0], keepdims=True, negative=True)))
self.assertListEqual([1] + cost_shape, T.shape(cost_k))
assert_allclose_(
T.grad([T.reduce_sum(cost_k)], [y])[0],
T.reduce_sum(wk_hat * (2 * x * y), axis=[0]))
def test_monto_carlo_objective(self):
log_p, log_q = prepare_test_payload()
ll = importance_sampling_log_likelihood(log_p, log_q, axis=[0])
ll_shape = T.shape(ll)
assert_allclose_(ll, T.log_mean_exp(log_p - log_q, axis=[0]))
assert_allclose_(
T.reduce_mean(ll),
importance_sampling_log_likelihood(log_p,
log_q,
axis=[0],
reduction='mean'))
assert_allclose_(
T.reduce_sum(ll),
importance_sampling_log_likelihood(log_p,
log_q,
axis=[0],
reduction='sum'))
ll_k = importance_sampling_log_likelihood(log_p,
log_q,
axis=[0],
keepdims=True)
self.assertListEqual([1] + ll_shape, T.shape(ll_k))
assert_allclose_(
ll_k, T.log_mean_exp(log_p - log_q, axis=[0], keepdims=True))
def log_prob_fn(t):
log_px = distribution.log_prob(t.transform_origin.tensor,
group_ndims=0)
y, log_det = flow(t.transform_origin.tensor) # y and log |dy/dx|
assert_allclose(y, t.tensor, atol=1e-4, rtol=1e-6)
ctx.assertEqual(
T.rank(log_det),
T.rank(log_px) -
(flow.get_x_event_ndims() - distribution.event_ndims))
return -log_det + T.reduce_sum(
log_px,
T.int_range(
-(flow.get_x_event_ndims() - distribution.event_ndims), 0))
def test_sgvb(self):
assert_allclose_ = functools.partial(assert_allclose,
rtol=1e-5,
atol=1e-6)
# default
x, y, z, f, log_f, log_q = prepare_test_payload(reparameterized=True)
cost = sgvb_estimator(f)
assert_allclose_(-cost, sgvb_estimator(f, negative=True))
assert_allclose_(T.reduce_mean(cost),
sgvb_estimator(f, reduction='mean'))
assert_allclose_(T.reduce_sum(cost), sgvb_estimator(f,
reduction='sum'))
cost_shape = T.shape(cost)
assert_allclose_(
T.grad([T.reduce_sum(cost)], [y])[0],
T.reduce_sum(2 * x * y * f, axis=[0]))
x, y, z, f, log_f, log_q = prepare_test_payload(reparameterized=True)
cost_r = sgvb_estimator(f, axis=[0])
assert_allclose_(-cost_r, sgvb_estimator(f, axis=[0], negative=True))
self.assertListEqual(cost_shape[1:], T.shape(cost_r))
assert_allclose_(
T.grad([T.reduce_sum(cost_r)], [y])[0],
T.reduce_sum(2 * x * y * f, axis=[0]) / 7)
x, y, z, f, log_f, log_q = prepare_test_payload(reparameterized=True)
cost_rk = sgvb_estimator(f, axis=[0], keepdims=True)
assert_allclose_(T.reduce_mean(cost_rk),
sgvb_estimator(f, axis=[0], reduction='mean'))
assert_allclose_(T.reduce_sum(cost_rk),
sgvb_estimator(f, axis=[0], reduction='sum'))
assert_allclose_(
-cost_rk, sgvb_estimator(f, axis=[0], keepdims=True,
negative=True))
self.assertListEqual([1] + cost_shape[1:], T.shape(cost_rk))
assert_allclose_(
T.grad([T.reduce_sum(cost_rk)], [y])[0],
T.reduce_sum(2 * x * y * f, axis=[0]) / 7)
def check_invertible_linear(ctx,
spatial_ndims: int,
invertible_linear_factory,
linear_factory,
strict: bool,):
batch_shape = [2]
num_features = 4
spatial_shape = [5, 6, 7][:spatial_ndims]
x = T.random.randn(make_conv_shape(
batch_shape, num_features, spatial_shape))
# construct the layer
flow = invertible_linear_factory(num_features, strict=strict)
ctx.assertIn(f'num_features={num_features}', repr(flow))
flow = tk.layers.jit_compile(flow)
# derive the expected answer
weight, log_det = flow.invertible_matrix(
inverse=False, compute_log_det=True)
linear_kwargs = {}
if spatial_ndims > 0:
linear_kwargs['kernel_size'] = 1
linear = linear_factory(
num_features, num_features,
weight_init=T.reshape(weight, T.shape(weight) + [1] * spatial_ndims),
use_bias=False,
**linear_kwargs
)
x_flatten, front_shape = T.flatten_to_ndims(x, spatial_ndims + 2)
expected_y = T.unflatten_from_ndims(linear(x_flatten), front_shape)
expected_log_det = T.expand(
T.reduce_sum(T.expand(log_det, spatial_shape)), batch_shape)
# check the invertible layer
flow_standard_check(ctx, flow, x, expected_y, expected_log_det,
T.random.randn(batch_shape))
def check_scale(ctx,
scale: Scale,
x,
pre_scale,
expected_y,
expected_log_det):
assert(T.shape(x) == T.shape(expected_log_det))
# dimension error
with pytest.raises(Exception,
match=r'`rank\(input\) >= event_ndims` does not hold'):
_ = scale(T.random.randn([1]), T.random.randn([1]), event_ndims=2)
with pytest.raises(Exception,
match=r'`rank\(input\) >= rank\(pre_scale\)` does not hold'):
_ = scale(T.random.randn([1]), T.random.randn([1, 2]), event_ndims=1)
with pytest.raises(Exception,
match=r'The shape of `input_log_det` is not expected'):
_ = scale(T.random.randn([2, 3]),
T.random.randn([2, 3]),
event_ndims=1,
input_log_det=T.random.randn([3]))
with pytest.raises(Exception,
match=r'The shape of `input_log_det` is not expected'):
_ = scale(T.random.randn([2, 3]),
T.random.randn([2, 3]),
event_ndims=2,
input_log_det=T.random.randn([2]))
# check call
for event_ndims in range(T.rank(pre_scale), T.rank(x)):
this_expected_log_det = T.reduce_sum(
expected_log_det, axis=T.int_range(-event_ndims, 0))
input_log_det = T.random.randn(T.shape(this_expected_log_det))
# check no compute log_det
y, log_det = scale(x, pre_scale, event_ndims=event_ndims,
compute_log_det=False)
assert_allclose(y, expected_y, rtol=1e-4, atol=1e-6)
ctx.assertIsNone(log_det)
# check compute log_det
y, log_det = scale(x, pre_scale, event_ndims=event_ndims)
assert_allclose(y, expected_y, rtol=1e-4, atol=1e-6)
assert_allclose(log_det, this_expected_log_det, rtol=1e-4, atol=1e-6)
# check compute log_det with input_log_det
y, log_det = scale(
x, pre_scale, event_ndims=event_ndims, input_log_det=input_log_det)
assert_allclose(y, expected_y, rtol=1e-4, atol=1e-6)
assert_allclose(log_det, input_log_det + this_expected_log_det,
rtol=1e-4, atol=1e-6)
# check inverse, no compute log_det
inv_x, log_det = scale(expected_y, pre_scale, event_ndims=event_ndims,
inverse=True, compute_log_det=False)
assert_allclose(inv_x, x, rtol=1e-4, atol=1e-6)
ctx.assertIsNone(log_det)
# check inverse, compute log_det
inv_x, log_det = scale(expected_y, pre_scale, event_ndims=event_ndims,
inverse=True)
assert_allclose(inv_x, x, rtol=1e-4, atol=1e-6)
assert_allclose(log_det, -this_expected_log_det, rtol=1e-4, atol=1e-6)
# check inverse, compute log_det with input_log_det
inv_x, log_det = scale(expected_y, pre_scale, event_ndims=event_ndims,
inverse=True, input_log_det=input_log_det)
assert_allclose(inv_x, x, rtol=1e-4, atol=1e-6)
assert_allclose(log_det, input_log_det - this_expected_log_det,
rtol=1e-4, atol=1e-6)
def test_sample_and_log_prob(self):
array_low = np.random.randn(2, 1)
array_high = np.exp(np.random.randn(1, 3)) + 1.
log_zero = -1e6
def log_prob(x, low, high, group_ndims=0):
if low is None and high is None:
low, high = 0., 1.
log_pdf = -np.log(np.ones_like(x) * (high - low))
log_pdf = np.where(np.logical_and(low <= x, x <= high), log_pdf,
log_zero)
log_pdf = np.sum(log_pdf, axis=tuple(range(-group_ndims, 0)))
return log_pdf
for shape, dtype, (low, high), event_ndims in product(
[None, [], [5, 4]], float_dtypes, [(None, None), (-1., 2.),
(array_low, array_high)],
range(5)):
low_rank = len(np.shape(low)) if low is not None else 0
if event_ndims > len(shape or []) + low_rank:
continue
if isinstance(low, np.ndarray):
low_t = T.as_tensor(low, dtype=dtype)
high_t = T.as_tensor(high, dtype=dtype)
uniform = Uniform(shape=shape,
low=low_t,
high=high_t,
event_ndims=event_ndims,
log_zero=log_zero)
value_shape = (shape or []) + [2, 3]
self.assertIs(uniform.low, low_t)
self.assertIs(uniform.high, high_t)
else:
uniform = Uniform(shape=shape,
low=low,
high=high,
dtype=dtype,
event_ndims=event_ndims,
log_zero=log_zero)
value_shape = shape or []
self.assertEqual(uniform.low, low)
self.assertEqual(uniform.high, high)
self.assertEqual(uniform.log_zero, log_zero)
self.assertEqual(uniform.value_shape, value_shape)
# sample(n_samples=None)
t = uniform.sample()
x = T.to_numpy(t.tensor)
sample_shape = value_shape
self.assertIsInstance(t, StochasticTensor)
self.assertIs(t.distribution, uniform)
self.assertEqual(T.get_dtype(t.tensor), dtype)
self.assertEqual(t.n_samples, None)
self.assertEqual(t.group_ndims, 0)
self.assertEqual(t.reparameterized, True)
self.assertIsInstance(t.tensor, T.Tensor)
self.assertEqual(T.shape(t.tensor), sample_shape)
for log_pdf in [t.log_prob(), uniform.log_prob(t)]:
self.assertEqual(T.get_dtype(log_pdf), dtype)
assert_allclose(log_pdf,
log_prob(x, low, high, event_ndims),
rtol=1e-4)
# test log-prob on out-of-range values
assert_allclose(
uniform.log_prob(t.tensor * 10.),
log_prob(x * 10., low, high, event_ndims),
rtol=1e-4,
)
# sample(n_samples=7)
if event_ndims >= 1:
t = uniform.sample(n_samples=7,
group_ndims=-1,
reparameterized=False)
x = T.to_numpy(t.tensor)
sample_shape = [7] + value_shape
self.assertIsInstance(t, StochasticTensor)
self.assertIs(t.distribution, uniform)
self.assertEqual(T.get_dtype(t.tensor), dtype)
self.assertEqual(t.n_samples, 7)
self.assertEqual(t.group_ndims, -1)
self.assertEqual(t.reparameterized, False)
self.assertIsInstance(t.tensor, T.Tensor)
self.assertEqual(T.shape(t.tensor), sample_shape)
reduce_ndims = event_ndims - 1
for log_pdf in [
t.log_prob(),
uniform.log_prob(t, group_ndims=-1)
]:
self.assertEqual(T.get_dtype(log_pdf), dtype)
assert_allclose(log_pdf,
log_prob(x, low, high, reduce_ndims),
rtol=1e-4)
# test reparameterized
low_t = T.requires_grad(T.as_tensor(array_low))
high_t = T.requires_grad(T.as_tensor(array_high))
uniform = Uniform(low=low_t, high=high_t)
t = uniform.sample()
self.assertTrue(t.reparameterized)
u = (T.to_numpy(t.tensor) - array_low) / (array_high - array_low)
[low_grad, high_grad] = T.grad([T.reduce_sum(t.tensor)],
[low_t, high_t])
assert_allclose(low_grad,
np.sum(1. - u, axis=-1, keepdims=True),
rtol=1e-4)
assert_allclose(high_grad, np.sum(u, axis=0, keepdims=True), rtol=1e-4)
t = uniform.sample(reparameterized=False)
w_t = T.requires_grad(T.as_tensor(np.random.randn(2, 3)))
self.assertFalse(t.reparameterized)
[low_grad, high_grad] = T.grad([T.reduce_sum(w_t * t.tensor)],
[low_t, high_t],
allow_unused=True)
self.assertTrue(T.is_null_grad(low_t, low_grad))
self.assertTrue(T.is_null_grad(high_t, high_grad))
def check_distribution_instance(ctx,
d,
event_ndims,
batch_shape,
min_event_ndims,
max_event_ndims,
log_prob_fn,
transform_origin_distribution=None,
transform_origin_group_ndims=None,
**expected_attrs):
ctx.assertLessEqual(max_event_ndims - event_ndims, d.batch_ndims)
event_shape = expected_attrs.get('event_shape', None)
ctx.assertEqual(d.min_event_ndims, min_event_ndims)
ctx.assertEqual(d.value_ndims, len(batch_shape) + event_ndims)
if event_shape is not None:
ctx.assertEqual(d.value_shape, batch_shape + event_shape)
ctx.assertEqual(d.batch_shape, batch_shape)
ctx.assertEqual(d.batch_ndims, len(batch_shape))
ctx.assertEqual(d.event_ndims, event_ndims)
ctx.assertEqual(d.event_shape, event_shape)
for attr, val in expected_attrs.items():
ctx.assertEqual(getattr(d, attr), val)
ctx.assertEqual(
d.validate_tensors,
expected_attrs.get('validate_tensors', settings.validate_tensors))
# check sample
for n_samples in (None, 5):
for group_ndims in (None, 0, -(event_ndims - min_event_ndims),
max_event_ndims - event_ndims):
for reparameterized2 in (None, True, False):
if reparameterized2 and not d.reparameterized:
continue
# sample()
sample_kwargs = {}
if n_samples is not None:
sample_kwargs['n_samples'] = n_samples
sample_shape = [n_samples]
else:
sample_shape = []
if group_ndims is not None:
sample_kwargs['group_ndims'] = group_ndims
else:
group_ndims = 0
if reparameterized2 is not None:
sample_kwargs['reparameterized'] = reparameterized2
else:
reparameterized2 = d.reparameterized
t = d.sample(**sample_kwargs)
ctx.assertEqual(t.group_ndims, group_ndims)
ctx.assertEqual(t.reparameterized, reparameterized2)
ctx.assertEqual(T.rank(t.tensor),
d.value_ndims + len(sample_shape))
ctx.assertEqual(
T.shape(t.tensor)[:(d.batch_ndims + len(sample_shape))],
sample_shape + d.batch_shape)
if transform_origin_distribution is not None:
ctx.assertIsInstance(t.transform_origin, StochasticTensor)
ctx.assertIs(t.transform_origin.distribution,
transform_origin_distribution)
ctx.assertIs(t.transform_origin.group_ndims,
transform_origin_group_ndims)
# log_prob()
expected_log_prob = log_prob_fn(t)
for group_ndims2 in (None, 0, -(event_ndims - min_event_ndims),
max_event_ndims - event_ndims):
if group_ndims2 is not None:
log_prob_kwargs = {'group_ndims': group_ndims2}
else:
log_prob_kwargs = {}
group_ndims2 = group_ndims
log_prob = t.log_prob(**log_prob_kwargs)
ctx.assertEqual(
T.shape(log_prob),
T.shape(t.tensor)[:T.rank(t.tensor) -
(group_ndims2 + event_ndims)])
assert_allclose(
log_prob,
T.reduce_sum(
expected_log_prob,
T.int_range(
-(group_ndims2 +
(event_ndims - min_event_ndims)), 0)),
rtol=1e-4,
atol=1e-6,
)
prob = t.prob(**log_prob_kwargs)
assert_allclose(prob,
T.exp(log_prob),
rtol=1e-4,
atol=1e-6)
if transform_origin_distribution is not None:
for p in (log_prob, prob):
ctx.assertIsInstance(p.transform_origin,
StochasticTensor)
ctx.assertIs(p.transform_origin.distribution,
transform_origin_distribution)
ctx.assertIs(p.transform_origin.group_ndims,
transform_origin_group_ndims)
def test_embedding(self):
n_channels = 3
n_embeddings = n_samples
for spatial_ndims in (0, 1, 2, 3):
w_shape = make_conv_shape([], n_channels, [4, 5,
6][:spatial_ndims])
w_size = int(np.prod(w_shape))
layer = getattr(tk.layers,
(f'Embedding{spatial_ndims}d' if spatial_ndims > 0
else 'Embedding'))(n_embeddings, w_shape)
weight = layer.weight
# check the weight
self.assertEqual(T.shape(weight), [n_embeddings] + w_shape)
reduce_axis = list(range(len(w_shape) + 1))
reduce_axis.pop(-1 if T.IS_CHANNEL_LAST else 1)
w_mean = np.average(T.to_numpy(weight), axis=tuple(reduce_axis))
np.testing.assert_array_less(
w_mean, 3. / np.sqrt(n_samples * w_size / n_channels))
# check the output
layer = jit_compile(layer)
weight_array = T.to_numpy(weight)
for in_shape in ([7], [7, 8]):
indices = T.random.randint(0, n_samples, in_shape)
indices = T.concat([indices, indices[:3]], axis=0)
# check the output
output = layer(indices)
assert_allclose(output, T.embedding(weight, indices))
# check the grad
if spatial_ndims in (0, 1):
out_sum = T.reduce_sum(output**2)
[grad] = T.grad([out_sum], [weight])
expected_grad = np.zeros(T.shape(weight))
for idx in T.to_numpy(indices).reshape([-1]):
expected_grad[idx] += 2. * weight_array[idx]
assert_allclose(grad, expected_grad)
# test the constructor error
if spatial_ndims > 0:
with pytest.raises(
ValueError,
match=f'`embedding_size` must be a int list '
f'with {spatial_ndims + 1} elements'):
_ = getattr(tk.layers,
f'Embedding{spatial_ndims}d')(n_embeddings,
w_shape[:-1])
# test no grad
layer = Embedding(n_embeddings, n_channels, freeze=True)
weight = layer.weight
self.assertEqual(T.shape(weight), [n_embeddings, n_channels])
layer = jit_compile(layer)
indices = T.random.randint(0, n_samples, [7, 8])
output = layer(indices)
assert_allclose(output, T.embedding(weight, indices))
out_sum = T.reduce_sum(output**2)
try:
[grad] = T.grad([out_sum], [weight])
except Exception:
pass
else:
self.assertTrue(T.is_null_grad(weight, grad))
# test errors
with pytest.raises(ValueError,
match='`embedding_size` must not be empty'):
_ = Embedding(n_embeddings, [])
def test_basic_interface(self):
normal = UnitNormal(shape=[2, 3])
samples = normal.sample(n_samples=5)
samples_0 = samples.tensor[0]
samples_no_grad = T.stop_grad(samples.tensor)
log_prob = normal.log_prob(samples.tensor, group_ndims=0)
log_prob_reduce_1 = T.reduce_sum(log_prob, axis=[-1])
##
t = StochasticTensor(
tensor=samples_no_grad,
distribution=normal,
n_samples=5,
group_ndims=0,
reparameterized=False,
)
self.assertIs(t.tensor, samples_no_grad)
self.assertIs(t.distribution, normal)
self.assertEqual(t.n_samples, 5)
self.assertEqual(t.group_ndims, 0)
self.assertEqual(t.reparameterized, False)
self.assertIsNone(t.transform_origin)
self.assertIsNone(t._cached_log_prob)
self.assertIsNone(t._cached_prob)
self.assertEqual(repr(t), f'StochasticTensor({t.tensor!r})')
self.assertEqual(hash(t), hash(t))
self.assertEqual(t, t)
self.assertNotEqual(
t,
StochasticTensor(
tensor=samples_0,
distribution=normal,
n_samples=5,
group_ndims=0,
reparameterized=False,
))
self.assertEqual(t.continuous, True)
# log_prob()
this_log_prob = t.log_prob()
self.assertIs(t._cached_log_prob, this_log_prob)
self.assertIs(t.log_prob(), t._cached_log_prob)
self.assertIs(t.log_prob(group_ndims=0), t._cached_log_prob)
assert_allclose(this_log_prob, log_prob, rtol=1e-4)
this_log_prob = t.log_prob(group_ndims=1)
self.assertIsNot(this_log_prob, t._cached_log_prob)
assert_allclose(this_log_prob, log_prob_reduce_1, rtol=1e-4)
# prob()
this_prob = t.prob()
self.assertIs(t._cached_prob, this_prob)
self.assertIs(t.prob(), t._cached_prob)
self.assertIs(t.prob(group_ndims=0), t._cached_prob)
assert_allclose(this_prob, np.exp(T.to_numpy(log_prob)), rtol=1e-4)
this_prob = t.prob(group_ndims=1)
self.assertIsNot(this_prob, t._cached_prob)
assert_allclose(this_prob,
np.exp(T.to_numpy(log_prob_reduce_1)),
rtol=1e-4)
##
normal.continuous = False
t = StochasticTensor(
tensor=samples_0,
distribution=normal,
n_samples=None,
group_ndims=1,
reparameterized=True,
log_prob=log_prob_reduce_1,
transform_origin=samples,
)
self.assertEqual(t.continuous, False)
self.assertIs(t.tensor, samples_0)
self.assertIs(t.distribution, normal)
self.assertEqual(t.n_samples, None)
self.assertEqual(t.group_ndims, 1)
self.assertEqual(t.reparameterized, True)
self.assertIs(t.transform_origin, samples)
self.assertIs(t._cached_log_prob, log_prob_reduce_1)
self.assertIsNone(t._cached_prob)
