def assert_ok(model, guide=None, max_plate_nesting=None, **kwargs):
"""
Assert that enumeration runs...
"""
with pyro_backend("pyro"):
pyro.clear_param_store()
if guide is None:
guide = lambda **kwargs: None # noqa: E731
q_pyro, q_funsor = LifoQueue(), LifoQueue()
q_pyro.put(Trace())
q_funsor.put(Trace())
while not q_pyro.empty() and not q_funsor.empty():
with pyro_backend("pyro"):
with handlers.enum(first_available_dim=-max_plate_nesting - 1):
guide_tr_pyro = handlers.trace(
handlers.queue(
guide,
q_pyro,
escape_fn=iter_discrete_escape,
extend_fn=iter_discrete_extend,
)).get_trace(**kwargs)
tr_pyro = handlers.trace(
handlers.replay(model,
trace=guide_tr_pyro)).get_trace(**kwargs)
with pyro_backend("contrib.funsor"):
with handlers.enum(first_available_dim=-max_plate_nesting - 1):
guide_tr_funsor = handlers.trace(
handlers.queue(
guide,
q_funsor,
escape_fn=iter_discrete_escape,
extend_fn=iter_discrete_extend,
)).get_trace(**kwargs)
tr_funsor = handlers.trace(
handlers.replay(model,
trace=guide_tr_funsor)).get_trace(**kwargs)
# make sure all dimensions were cleaned up
assert _DIM_STACK.local_frame is _DIM_STACK.global_frame
assert (not _DIM_STACK.global_frame.name_to_dim
and not _DIM_STACK.global_frame.dim_to_name)
assert _DIM_STACK.outermost is None
tr_pyro = prune_subsample_sites(tr_pyro.copy())
tr_funsor = prune_subsample_sites(tr_funsor.copy())
_check_traces(tr_pyro, tr_funsor)
def test_not_implemented(backend):
pytest.importorskip(PACKAGE_NAME[backend])
with pyro_backend(backend):
pyro.sample # should be implemented
pyro.param # should be implemented
with pytest.raises(NotImplementedError):
pyro.nonexistent_primitive
def test_nesting():
def testing():
with pyro.markov():
v1 = pyro.to_data(Tensor(torch.ones(2), OrderedDict([(str(1), funsor.Bint[2])]), 'real'))
print(1, v1.shape) # shapes should alternate
assert v1.shape == (2,)
with pyro.markov():
v2 = pyro.to_data(Tensor(torch.ones(2), OrderedDict([(str(2), funsor.Bint[2])]), 'real'))
print(2, v2.shape) # shapes should alternate
assert v2.shape == (2, 1)
with pyro.markov():
v3 = pyro.to_data(Tensor(torch.ones(2), OrderedDict([(str(3), funsor.Bint[2])]), 'real'))
print(3, v3.shape) # shapes should alternate
assert v3.shape == (2,)
with pyro.markov():
v4 = pyro.to_data(Tensor(torch.ones(2), OrderedDict([(str(4), funsor.Bint[2])]), 'real'))
print(4, v4.shape) # shapes should alternate
assert v4.shape == (2, 1)
with pyro_backend("contrib.funsor"), NamedMessenger(first_available_dim=-1):
testing()
def test_trace_handler(model, backend):
pytest.importorskip(PACKAGE_NAME[backend])
with pyro_backend(backend), handlers.seed(rng_seed=2):
f = MODELS[model]()
model, model_args, model_kwargs = f['model'], f.get('model_args', ()), f.get('model_kwargs', {})
# should be implemented
handlers.trace(model).get_trace(*model_args, **model_kwargs)
def test_model_sample(model, backend):
pytest.importorskip(PACKAGE_NAME[backend])
with pyro_backend(backend), handlers.seed(rng_seed=2):
f = MODELS[model]()
model, model_args, model_kwargs = f['model'], f.get(
'model_args', ()), f.get('model_kwargs', {})
model(*model_args, **model_kwargs)
def test_model_enumerated_elbo(model, guide, data, history):
pyro.clear_param_store()
with pyro_backend("contrib.funsor"):
if history > 1:
pytest.xfail(
reason="TraceMarkovEnum_ELBO does not yet support history > 1")
model = infer.config_enumerate(model, default="parallel")
elbo = infer.TraceEnum_ELBO(max_plate_nesting=4)
expected_loss = elbo.loss_and_grads(model, guide, data, history, False)
expected_grads = (
value.grad
for name, value in pyro.get_param_store().named_parameters())
vectorized_elbo = infer.TraceMarkovEnum_ELBO(max_plate_nesting=4)
actual_loss = vectorized_elbo.loss_and_grads(model, guide, data,
history, True)
actual_grads = (
value.grad
for name, value in pyro.get_param_store().named_parameters())
assert_close(actual_loss, expected_loss)
for actual_grad, expected_grad in zip(actual_grads, expected_grads):
assert_close(actual_grad, expected_grad)
def test_guide_enumerated_elbo(model, guide, data, history):
pyro.clear_param_store()
with pyro_backend("contrib.funsor"), \
pytest.raises(
NotImplementedError,
match="TraceMarkovEnum_ELBO does not yet support guide side Markov enumeration"):
if history > 1:
pytest.xfail(
reason="TraceMarkovEnum_ELBO does not yet support history > 1")
elbo = infer.TraceEnum_ELBO(max_plate_nesting=4)
expected_loss = elbo.loss_and_grads(model, guide, data, history, False)
expected_grads = (
value.grad
for name, value in pyro.get_param_store().named_parameters())
vectorized_elbo = infer.TraceMarkovEnum_ELBO(max_plate_nesting=4)
actual_loss = vectorized_elbo.loss_and_grads(model, guide, data,
history, True)
actual_grads = (
value.grad
for name, value in pyro.get_param_store().named_parameters())
assert_close(actual_loss, expected_loss)
for actual_grad, expected_grad in zip(actual_grads, expected_grads):
assert_close(actual_grad, expected_grad)
def _guide_from_model(model):
try:
with pyro_backend("contrib.funsor"):
return handlers.block(
infer.config_enumerate(model, default="parallel"),
lambda msg: msg.get("is_observed", False))
except KeyError: # for test collection without funsor
return model
def test_mcmc_interface(model, backend):
pytest.importorskip(PACKAGE_NAME[backend])
with pyro_backend(backend), handlers.seed(rng_seed=20):
f = MODELS[model]()
model, args, kwargs = f['model'], f.get('model_args', ()), f.get('model_kwargs', {})
nuts_kernel = infer.NUTS(model=model)
mcmc = infer.MCMC(nuts_kernel, num_samples=10, warmup_steps=10)
mcmc.run(*args, **kwargs)
mcmc.summary()
def test_fresh_inputs_to_funsor():
def testing():
x = pyro.to_funsor(torch.tensor([0., 1.]), funsor.Real, dim_to_name={-1: "x"})
assert set(x.inputs) == {"x"}
px = pyro.to_funsor(torch.ones(2, 3), funsor.Real, dim_to_name={-2: "x", -1: "y"})
assert px.inputs["x"].dtype == 2 and px.inputs["y"].dtype == 3
with pyro_backend("contrib.funsor"), NamedMessenger():
testing()
def test_rng_seed(backend):
def model():
return pyro.sample("x", dist.Normal(0, 1))
with pyro_backend(backend):
with handlers.seed(rng_seed=0):
expected = model()
with handlers.seed(rng_seed=0):
actual = model()
assert ops.allclose(actual, expected)
def test_generate_data(backend):
def model():
loc = pyro.param("loc", torch.tensor(2.0))
scale = pyro.param("scale", torch.tensor(1.0))
x = pyro.sample("x", dist.Normal(loc, scale))
return x
with pyro_backend(backend):
data = model()
data = data.data
assert data.shape == ()
def test_register_backend(model):
pytest.importorskip("pyro")
register_backend("foo", {
"infer": "pyro.contrib.minipyro",
"optim": "pyro.contrib.minipyro",
"pyro": "pyro.contrib.minipyro",
})
with pyro_backend("foo"):
f = MODELS[model]()
model, model_args, model_kwargs = f['model'], f.get('model_args', ()), f.get('model_kwargs', {})
handlers.trace(model).get_trace(*model_args, **model_kwargs)
def test_staggered_fresh():
def testing():
for i in pyro.markov(range(12)):
if i % 4 == 0:
fv2 = pyro.to_funsor(torch.zeros(2), funsor.Real, dim_to_name={-1: "a"})
v2 = pyro.to_data(fv2)
assert v2.shape == (2,)
print("a", v2.shape)
print("a", fv2.inputs)
with pyro_backend("contrib.funsor"), NamedMessenger(first_available_dim=-1):
testing()
def test_nonempty_model_empty_guide_ok(backend, jit):
def model(data):
loc = pyro.param("loc", torch.tensor(0.0))
pyro.sample("x", dist.Normal(loc, 1.), obs=data)
def guide(data):
pass
data = torch.tensor(2.)
with pyro_backend(backend):
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
assert_ok(model, guide, elbo, data)
def test_staggered():
def testing():
for i in pyro.markov(range(12)):
if i % 4 == 0:
v2 = pyro.to_data(Tensor(torch.zeros(2), OrderedDict([('a', funsor.Bint[2])]), 'real'))
fv2 = pyro.to_funsor(v2, funsor.Real)
assert v2.shape == (2,)
print('a', v2.shape)
print('a', fv2.inputs)
with pyro_backend("contrib.funsor"), NamedMessenger(first_available_dim=-1):
testing()
def test_mean_field_warn(backend):
def model():
x = pyro.sample("x", dist.Normal(0., 1.))
pyro.sample("y", dist.Normal(x, 1.))
def guide():
loc = pyro.param("loc", torch.tensor(0.))
y = pyro.sample("y", dist.Normal(loc, 1.))
pyro.sample("x", dist.Normal(y, 1.))
with pyro_backend(backend):
elbo = infer.TraceMeanField_ELBO()
assert_warning(model, guide, elbo)
def test_gaussian_probit_hmm_smoke(exact, jit):
def model(data):
T, N, D = data.shape # time steps, individuals, features
# Gaussian initial distribution.
init_loc = pyro.param("init_loc", torch.zeros(D))
init_scale = pyro.param("init_scale",
1e-2 * torch.eye(D),
constraint=constraints.lower_cholesky)
# Linear dynamics with Gaussian noise.
trans_const = pyro.param("trans_const", torch.zeros(D))
trans_coeff = pyro.param("trans_coeff", torch.eye(D))
noise = pyro.param("noise",
1e-2 * torch.eye(D),
constraint=constraints.lower_cholesky)
obs_plate = pyro.plate("channel", D, dim=-1)
with pyro.plate("data", N, dim=-2):
state = None
for t in range(T):
# Transition.
if t == 0:
loc = init_loc
scale_tril = init_scale
else:
loc = trans_const + funsor.torch.torch_tensordot(
trans_coeff, state, 1)
scale_tril = noise
state = pyro.sample("state_{}".format(t),
dist.MultivariateNormal(loc, scale_tril),
infer={"exact": exact})
# Factorial probit likelihood model.
with obs_plate:
pyro.sample("obs_{}".format(t),
dist.Bernoulli(logits=state["channel"]),
obs=data[t])
def guide(data):
pass
data = torch.distributions.Bernoulli(0.5).sample((3, 4, 2))
with pyro_backend("funsor"):
Elbo = infer.JitTraceEnum_ELBO if jit else infer.TraceEnum_ELBO
elbo = Elbo()
adam = optim.Adam({"lr": 1e-3})
svi = infer.SVI(model, guide, adam, elbo)
svi.step(data)
def main(args):
funsor.set_backend("torch")
# Define a basic model with a single Normal latent random variable `loc`
# and a batch of Normally distributed observations.
def model(data):
loc = pyro.sample("loc", dist.Normal(0., 1.))
with pyro.plate("data", len(data), dim=-1):
pyro.sample("obs", dist.Normal(loc, 1.), obs=data)
# Define a guide (i.e. variational distribution) with a Normal
# distribution over the latent random variable `loc`.
def guide(data):
guide_loc = pyro.param("guide_loc", torch.tensor(0.))
guide_scale = pyro.param("guide_scale", torch.tensor(1.),
constraint=constraints.positive)
pyro.sample("loc", dist.Normal(guide_loc, guide_scale))
# Generate some data.
torch.manual_seed(0)
data = torch.randn(100) + 3.0
# Because the API in minipyro matches that of Pyro proper,
# training code works with generic Pyro implementations.
with pyro_backend(args.backend), interpretation(MonteCarlo()):
# Construct an SVI object so we can do variational inference on our
# model/guide pair.
Elbo = infer.JitTrace_ELBO if args.jit else infer.Trace_ELBO
elbo = Elbo()
adam = optim.Adam({"lr": args.learning_rate})
svi = infer.SVI(model, guide, adam, elbo)
# Basic training loop
pyro.get_param_store().clear()
for step in range(args.num_steps):
loss = svi.step(data)
if args.verbose and step % 100 == 0:
print("step {} loss = {}".format(step, loss))
# Report the final values of the variational parameters
# in the guide after training.
if args.verbose:
for name in pyro.get_param_store():
value = pyro.param(name).data
print("{} = {}".format(name, value.detach().cpu().numpy()))
# For this simple (conjugate) model we know the exact posterior. In
# particular we know that the variational distribution should be
# centered near 3.0. So let's check this explicitly.
assert (pyro.param("guide_loc") - 3.0).abs() < 0.1
def test_elbo_plate_plate(backend, outer_dim, inner_dim):
with pyro_backend(backend):
pyro.get_param_store().clear()
num_particles = 1
q = pyro.param("q", torch.tensor([0.75, 0.25], requires_grad=True))
p = 0.2693204236205713 # for which kl(Categorical(q), Categorical(p)) = 0.5
p = torch.tensor([p, 1 - p])
def model():
d = dist.Categorical(p)
context1 = pyro.plate("outer", outer_dim, dim=-1)
context2 = pyro.plate("inner", inner_dim, dim=-2)
pyro.sample("w", d)
with context1:
pyro.sample("x", d)
with context2:
pyro.sample("y", d)
with context1, context2:
pyro.sample("z", d)
def guide():
d = dist.Categorical(pyro.param("q"))
context1 = pyro.plate("outer", outer_dim, dim=-1)
context2 = pyro.plate("inner", inner_dim, dim=-2)
pyro.sample("w", d, infer={"enumerate": "parallel"})
with context1:
pyro.sample("x", d, infer={"enumerate": "parallel"})
with context2:
pyro.sample("y", d, infer={"enumerate": "parallel"})
with context1, context2:
pyro.sample("z", d, infer={"enumerate": "parallel"})
kl_node = kl_divergence(
torch.distributions.Categorical(funsor.to_data(q)),
torch.distributions.Categorical(funsor.to_data(p)))
kl = (1 + outer_dim + inner_dim + outer_dim * inner_dim) * kl_node
expected_loss = kl
expected_grad = grad(kl, [funsor.to_data(q)])[0]
elbo = infer.TraceEnum_ELBO(num_particles=num_particles,
vectorize_particles=True,
strict_enumeration_warning=True)
elbo = elbo.differentiable_loss if backend == "pyro" else elbo
actual_loss = funsor.to_data(elbo(model, guide))
actual_loss.backward()
actual_grad = funsor.to_data(pyro.param('q')).grad
assert ops.allclose(actual_loss, expected_loss, atol=1e-5)
assert ops.allclose(actual_grad, expected_grad, atol=1e-5)
def test_generate_data_plate(backend):
num_points = 1000
def model(data=None):
loc = pyro.param("loc", torch.tensor(2.0))
scale = pyro.param("scale", torch.tensor(1.0))
with pyro.plate("data", 1000, dim=-1):
x = pyro.sample("x", dist.Normal(loc, scale), obs=data)
return x
with pyro_backend(backend):
data = model().data
assert data.shape == (num_points, )
mean = data.sum().item() / num_points
assert 1.9 <= mean <= 2.1
def test_optimizer(backend, optim_name, jit):
def model(data):
p = pyro.param("p", torch.tensor(0.5))
pyro.sample("x", dist.Bernoulli(p), obs=data)
def guide(data):
pass
data = torch.tensor(0.)
with pyro_backend(backend):
pyro.get_param_store().clear()
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
optimizer = getattr(optim, optim_name)({"lr": 1e-6})
inference = infer.SVI(model, guide, optimizer, elbo)
for i in range(2):
inference.step(data)
def test_constraints(backend, jit):
data = torch.tensor(0.5)
def model():
locs = pyro.param("locs", torch.randn(3), constraint=constraints.real)
scales = pyro.param("scales", torch.randn(3).exp(), constraint=constraints.positive)
p = torch.tensor([0.5, 0.3, 0.2])
x = pyro.sample("x", dist.Categorical(p))
pyro.sample("obs", dist.Normal(locs[x], scales[x]), obs=data)
def guide():
q = pyro.param("q", torch.randn(3).exp(), constraint=constraints.simplex)
pyro.sample("x", dist.Categorical(q))
with pyro_backend(backend):
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
assert_ok(model, guide, elbo)
def test_iteration_fresh():
def testing():
for i in pyro.markov(range(5)):
fv1 = pyro.to_funsor(torch.zeros(2), funsor.Real, dim_to_name={-1: str(i)})
fv2 = pyro.to_funsor(torch.ones(2), funsor.Real, dim_to_name={-1: "a"})
v1 = pyro.to_data(fv1)
v2 = pyro.to_data(fv2)
print(i, v1.shape) # shapes should alternate
if i % 2 == 0:
assert v1.shape == (2,)
else:
assert v1.shape == (2, 1, 1)
assert v2.shape == (2, 1)
print(i, fv1.inputs)
print("a", v2.shape) # shapes should stay the same
print("a", fv2.inputs)
with pyro_backend("contrib.funsor"), NamedMessenger(first_available_dim=-1):
testing()
def test_plate_ok(backend, jit):
data = torch.randn(10)
def model():
locs = pyro.param("locs", torch.tensor([0.2, 0.3, 0.5]))
p = torch.tensor([0.2, 0.3, 0.5])
with pyro.plate("plate", len(data), dim=-1):
x = pyro.sample("x", dist.Categorical(p))
pyro.sample("obs", dist.Normal(locs[x], 1.), obs=data)
def guide():
p = pyro.param("p", torch.tensor([0.5, 0.3, 0.2]))
with pyro.plate("plate", len(data), dim=-1):
pyro.sample("x", dist.Categorical(p))
with pyro_backend(backend):
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
assert_ok(model, guide, elbo)
def test_nested_plate_plate_ok(backend, jit):
data = torch.randn(2, 3)
def model():
loc = torch.tensor(3.0)
with pyro.plate("plate_outer", data.size(-1), dim=-1):
x = pyro.sample("x", dist.Normal(loc, 1.))
with pyro.plate("plate_inner", data.size(-2), dim=-2):
pyro.sample("y", dist.Normal(x, 1.), obs=data)
def guide():
loc = pyro.param("loc", torch.tensor(0.))
scale = pyro.param("scale", torch.tensor(1.))
with pyro.plate("plate_outer", data.size(-1), dim=-1):
pyro.sample("x", dist.Normal(loc, scale))
with pyro_backend(backend):
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
assert_ok(model, guide, elbo)
def test_iteration():
def testing():
for i in pyro.markov(range(5)):
v1 = pyro.to_data(Tensor(torch.ones(2), OrderedDict([(str(i), funsor.Bint[2])]), 'real'))
v2 = pyro.to_data(Tensor(torch.zeros(2), OrderedDict([('a', funsor.Bint[2])]), 'real'))
fv1 = pyro.to_funsor(v1, funsor.Real)
fv2 = pyro.to_funsor(v2, funsor.Real)
print(i, v1.shape) # shapes should alternate
if i % 2 == 0:
assert v1.shape == (2,)
else:
assert v1.shape == (2, 1, 1)
assert v2.shape == (2, 1)
print(i, fv1.inputs)
print('a', v2.shape) # shapes should stay the same
print('a', fv2.inputs)
with pyro_backend("contrib.funsor"), NamedMessenger(first_available_dim=-1):
testing()
def test_local_param_ok(backend, jit):
data = torch.randn(10)
def model():
locs = pyro.param("locs", torch.tensor([-1., 0., 1.]))
with pyro.plate("plate", len(data), dim=-1):
x = pyro.sample("x", dist.Categorical(torch.ones(3) / 3))
pyro.sample("obs", dist.Normal(locs[x], 1.), obs=data)
def guide():
with pyro.plate("plate", len(data), dim=-1):
p = pyro.param("p", torch.ones(len(data), 3) / 3, event_dim=1)
pyro.sample("x", dist.Categorical(p))
return p
with pyro_backend(backend):
Elbo = infer.JitTrace_ELBO if jit else infer.Trace_ELBO
elbo = Elbo(ignore_jit_warnings=True)
assert_ok(model, guide, elbo)
# Check that pyro.param() can be called without init_value.
expected = guide()
actual = pyro.param("p")
assert ops.allclose(actual, expected)
def backend(request):
with pyro_backend(request.param):
yield
def test_tmc_categoricals(depth, max_plate_nesting, num_samples, tmc_strategy):
def model():
x = pyro.sample("x0", dist.Categorical(pyro.param("q0")))
with pyro.plate("local", 3):
for i in range(1, depth):
x = pyro.sample(
"x{}".format(i),
dist.Categorical(pyro.param("q{}".format(i))[..., x, :]))
with pyro.plate("data", 4):
pyro.sample("y",
dist.Bernoulli(pyro.param("qy")[..., x]),
obs=data)
with pyro_backend("pyro"):
# initialize
qs = [pyro.param("q0", torch.tensor([0.4, 0.6], requires_grad=True))]
for i in range(1, depth):
qs.append(
pyro.param("q{}".format(i),
torch.randn(2, 2).abs().detach().requires_grad_(),
constraint=constraints.simplex))
qs.append(
pyro.param("qy", torch.tensor([0.75, 0.25], requires_grad=True)))
qs = [q.unconstrained() for q in qs]
data = (torch.rand(4, 3) > 0.5).to(dtype=qs[-1].dtype,
device=qs[-1].device)
with pyro_backend("pyro"):
elbo = infer.TraceTMC_ELBO(max_plate_nesting=max_plate_nesting)
enum_model = infer.config_enumerate(model,
default="parallel",
expand=False,
num_samples=num_samples,
tmc=tmc_strategy)
expected_loss = (
-elbo.differentiable_loss(enum_model, lambda: None)).exp()
expected_grads = grad(expected_loss, qs)
with pyro_backend("contrib.funsor"):
tmc = infer.TraceTMC_ELBO(max_plate_nesting=max_plate_nesting)
tmc_model = infer.config_enumerate(model,
default="parallel",
expand=False,
num_samples=num_samples,
tmc=tmc_strategy)
actual_loss = (-tmc.differentiable_loss(tmc_model, lambda: None)).exp()
actual_grads = grad(actual_loss, qs)
prec = 0.05
assert_equal(actual_loss,
expected_loss,
prec=prec,
msg="".join([
"\nexpected loss = {}".format(expected_loss),
"\n actual loss = {}".format(actual_loss),
]))
for actual_grad, expected_grad in zip(actual_grads, expected_grads):
assert_equal(actual_grad,
expected_grad,
prec=prec,
msg="".join([
"\nexpected grad = {}".format(
expected_grad.detach().cpu().numpy()),
"\n actual grad = {}".format(
actual_grad.detach().cpu().numpy()),
]))