def random_module(name, nn_module, prior, *args, **kwargs):
"""
Places a prior over the parameters of the module `nn_module`.
Returns a distribution (callable) over `nn.Module`s, which
upon calling returns a sampled `nn.Module`.
See the `Bayesian Regression tutorial <http://pyro.ai/examples/bayesian_regression.html>`_
for an example.
:param name: name of pyro module
:type name: str
:param nn_module: the module to be registered with pyro
:type nn_module: torch.nn.Module
:param prior: pyro distribution, stochastic function, or python dict with parameter names
as keys and respective distributions/stochastic functions as values.
:returns: a callable which returns a sampled module
"""
assert hasattr(nn_module, "parameters"), "Module is not a NN module."
# register params in param store
lifted_fn = poutine.lift(module, prior)
def _fn():
nn_copy = copy.deepcopy(nn_module)
# update_module_params must be True or the lifted module will not update local params
return lifted_fn(name,
nn_copy,
update_module_params=True,
*args,
**kwargs)
return _fn
def random_module(name, nn_module, prior, *args, **kwargs):
"""
Places a prior over the parameters of the module `nn_module`.
Returns a distribution (callable) over `nn.Module`s, which
upon calling returns a sampled `nn.Module`.
See the `Bayesian Regression tutorial <http://pyro.ai/examples/bayesian_regression.html>`_
for an example.
:param name: name of pyro module
:type name: str
:param nn_module: the module to be registered with pyro
:type nn_module: torch.nn.Module
:param prior: pyro distribution, stochastic function, or python dict with parameter names
as keys and respective distributions/stochastic functions as values.
:returns: a callable which returns a sampled module
"""
assert hasattr(nn_module, "parameters"), "Module is not a NN module."
# register params in param store
lifted_fn = poutine.lift(module, prior)
def _fn():
nn_copy = copy.deepcopy(nn_module)
# update_module_params must be True or the lifted module will not update local params
return lifted_fn(name, nn_copy, update_module_params=True, *args, **kwargs)
return _fn
def random_module(name, nn_module, prior, *args, **kwargs):
"""
Places a prior over the parameters of the module `nn_module`.
See the `Bayesian Regression <http://pyro.ai/examples/bayesian_regression.html>`_
tutorial for an example.
:param name: name of pyro module
:type name: str
:param nn_module: the module to be registered with pyro
:type nn_module: torch.nn.Module
:param prior: prior distribution or iterable over distributions
:returns: a callable which returns a sampled module
"""
assert hasattr(nn_module, "parameters"), "Module is not a NN module."
# register params in param store
lifted_fn = poutine.lift(module, prior)
def _fn():
nn_copy = copy.deepcopy(nn_module)
# update_module_params must be True or the lifted module will not update local params
return lifted_fn(name,
nn_copy,
update_module_params=True,
*args,
**kwargs)
return _fn
def test_splice(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior)).get_trace()
for name in tr.nodes.keys():
if name in ('loc1', 'loc2', 'scale1', 'scale2'):
assert name not in lifted_tr
else:
assert name in lifted_tr
def test_splice(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior)).get_trace()
for name in tr.nodes.keys():
if name in ('mu1', 'mu2', 'sigma1', 'sigma2'):
self.assertFalse(name in lifted_tr)
else:
self.assertTrue(name in lifted_tr)
def test_splice(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior)).get_trace()
for name in tr.nodes.keys():
if name in ('loc1', 'loc2', 'scale1', 'scale2'):
assert name not in lifted_tr
else:
assert name in lifted_tr
def test_splice(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide,
prior=self.prior)).get_trace()
for name in tr.nodes.keys():
if name in ('mu1', 'mu2', 'sigma1', 'sigma2'):
self.assertFalse(name in lifted_tr)
else:
self.assertTrue(name in lifted_tr)
def test_prior_dict(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior_dict)).get_trace()
for name in tr.nodes.keys():
assert name in lifted_tr
if name in {'scale1', 'loc1', 'scale2', 'loc2'}:
assert name + "_prior" == lifted_tr.nodes[name]['fn'].__name__
if tr.nodes[name]["type"] == "param":
assert lifted_tr.nodes[name]["type"] == "sample"
assert not lifted_tr.nodes[name]["is_observed"]
def test_prior_dict(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior_dict)).get_trace()
for name in tr.nodes.keys():
assert name in lifted_tr
if name in {'scale1', 'loc1', 'scale2', 'loc2'}:
assert name + "_prior" == lifted_tr.nodes[name]['fn'].__name__
if tr.nodes[name]["type"] == "param":
assert lifted_tr.nodes[name]["type"] == "sample"
assert not lifted_tr.nodes[name]["is_observed"]
def test_prior_dict(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.prior_dict)).get_trace()
for name in tr.nodes.keys():
self.assertTrue(name in lifted_tr)
if name in {'sigma1', 'mu1', 'sigma2', 'mu2'}:
self.assertTrue(name + "_prior" == lifted_tr.nodes[name]['fn'].__name__)
if tr.nodes[name]["type"] == "param":
self.assertTrue(lifted_tr.nodes[name]["type"] == "sample" and
not lifted_tr.nodes[name]["is_observed"])
def _traces(self, *args, **kwargs):
# find good initial trace
model_trace = poutine.trace(self.model).get_trace(*args, **kwargs)
best_log_prob = model_trace.log_prob_sum()
for i in range(20):
trace = poutine.trace(self.model).get_trace(*args, **kwargs)
log_prob = trace.log_prob_sum()
if log_prob > best_log_prob:
best_log_prob = log_prob
model_trace = trace
# lift model
prior, unpacked = {}, {}
param_constraints = pyro.get_param_store().get_state()["constraints"]
for name, node in model_trace.nodes.items():
if node["type"] == "param":
if param_constraints[name] is constraints.positive:
prior[name] = dist.HalfCauchy(2)
else:
prior[name] = dist.Normal(0, 10)
unpacked[name] = pyro.param(name).unconstrained()
elif name in self.start:
unpacked[name] = self.start[name]
elif node["type"] == "sample" and not node["is_observed"]:
unpacked[name] = transform_to(node["fn"].support).inv(
node["value"])
lifted_model = poutine.lift(self.model, prior)
# define guide
packed = torch.cat(
[v.clone().detach().reshape(-1) for v in unpacked.values()])
pyro.param("auto_loc", packed)
delta_guide = AutoLaplaceApproximation(lifted_model)
# train guide
optimizer = torch.optim.LBFGS(
(pyro.param("auto_loc").unconstrained(), ), lr=0.1, max_iter=500)
loss_and_grads = Trace_ELBO().loss_and_grads
def closure():
optimizer.zero_grad()
return loss_and_grads(lifted_model, delta_guide, *args, **kwargs)
optimizer.step(closure)
guide = delta_guide.laplace_approximation(*args, **kwargs)
# get posterior
for i in range(self.num_samples):
guide_trace = poutine.trace(guide).get_trace(*args, **kwargs)
model_poutine = poutine.trace(
poutine.replay(lifted_model, trace=guide_trace))
yield model_poutine.get_trace(*args, **kwargs), 1.0
pyro.clear_param_store()
def test_unlifted_param(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(poutine.lift(self.guide, prior=self.partial_dict)).get_trace()
for name in tr.nodes.keys():
assert name in lifted_tr
if name in ('sigma1', 'mu1'):
assert name + "_prior" == lifted_tr.nodes[name]['fn'].__name__
assert lifted_tr.nodes[name]["type"] == "sample"
assert not lifted_tr.nodes[name]["is_observed"]
if name in ('sigma2', 'mu2'):
assert lifted_tr.nodes[name]["type"] == "param"
def test_prior_dict(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(
poutine.lift(self.guide, prior=self.prior_dict)).get_trace()
for name in tr.nodes.keys():
self.assertTrue(name in lifted_tr)
if name in {'sigma1', 'mu1', 'sigma2', 'mu2'}:
self.assertTrue(
name + "_prior" == lifted_tr.nodes[name]['fn'].__name__)
if tr.nodes[name]["type"] == "param":
self.assertTrue(lifted_tr.nodes[name]["type"] == "sample"
and not lifted_tr.nodes[name]["is_observed"])
def test_unlifted_param(self):
tr = poutine.trace(self.guide).get_trace()
lifted_tr = poutine.trace(
poutine.lift(self.guide, prior=self.partial_dict)
).get_trace()
for name in tr.nodes.keys():
assert name in lifted_tr
if name in ("scale1", "loc1"):
assert name + "_prior" == lifted_tr.nodes[name]["fn"].__name__
assert lifted_tr.nodes[name]["type"] == "sample"
assert not lifted_tr.nodes[name]["is_observed"]
if name in ("scale2", "loc2"):
assert lifted_tr.nodes[name]["type"] == "param"
def sim(posterior, data=None, n=1000):
obs_node = posterior.exec_traces[0].observation_nodes[-1]
obs = []
if data is None:
for i in range(n):
idx = posterior._categorical.sample().item()
trace = posterior.exec_traces[idx]
obs.append(trace.nodes[obs_node]["fn"].sample())
else:
data[obs_node] = None
predictive = TracePredictive(
poutine.lift(posterior.model, lambda: None), posterior,
n).run(**data)
for trace in predictive.exec_traces:
obs.append(trace.nodes[obs_node]["value"])
return torch.stack(obs).detach()
def sim(posterior, data=None, n=1000):
obs_node = posterior.exec_traces[0].observation_nodes[-1]
obs = []
if data is None:
for i in range(n):
idx = posterior._categorical.sample().item()
trace = posterior.exec_traces[idx]
obs.append(trace.nodes[obs_node]["fn"].sample())
else:
data = {name: data[name] if name in data else None
for name in inspect.signature(posterior.model).parameters}
predictive = TracePredictive(poutine.lift(posterior.model, dist.Normal(0, 1)),
posterior, n).run(**data)
for trace in predictive.exec_traces:
obs.append(trace.nodes[obs_node]["value"])
return torch.stack(obs).detach()
def random_module(name, nn_module, prior, *args, **kwargs):
r"""
.. warning::
The `random_module` primitive is deprecated, and will be removed
in a future release. Use :class:`~pyro.nn.module.PyroModule` instead to
to create Bayesian modules from :class:`torch.nn.Module` instances.
See the `Bayesian Regression tutorial <http://pyro.ai/examples/bayesian_regression.html>`_
for an example.
DEPRECATED Places a prior over the parameters of the module `nn_module`.
Returns a distribution (callable) over `nn.Module`\s, which upon calling
returns a sampled `nn.Module`.
:param name: name of pyro module
:type name: str
:param nn_module: the module to be registered with pyro
:type nn_module: torch.nn.Module
:param prior: pyro distribution, stochastic function, or python dict with parameter names
as keys and respective distributions/stochastic functions as values.
:returns: a callable which returns a sampled module
"""
warnings.warn(
"The `random_module` primitive is deprecated, and will be removed "
"in a future release. Use `pyro.nn.Module` to create Bayesian "
"modules from `torch.nn.Module` instances.",
FutureWarning,
)
assert hasattr(nn_module, "parameters"), "Module is not a NN module."
# register params in param store
lifted_fn = poutine.lift(module, prior=prior)
def _fn():
nn_copy = copy.deepcopy(nn_module)
# update_module_params must be True or the lifted module will not update local params
return lifted_fn(name,
nn_copy,
update_module_params=True,
*args,
**kwargs)
return _fn
def test_memoize(self):
poutine.trace(
poutine.lift(self.dup_param_guide, prior=dist.Normal(0, 1)))()
