def load_parameters(uuid_map=None,
parameters_file=None,
variable_constants_file=None,
mxnet_constants_file=None,
context=None,
dtype=None,
current_params=None):
"""
Loads back a sest of InferenceParameters from files.
:param parameters_file: These are the parameters of the previous inference algorithm. These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants_file: file saved down with mx.nd.save(), so a {uuid: mx.nd.array} mapping saved in a binary format.
:param mxnet_constants_file: These are the constants in mxnet format from the previous inference algorithm. These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants_file: file saved down with mx.nd.save(), so a {uuid: mx.nd.array} mapping saved in a binary format.
:param variable_constants_file: These are the constants in primitive format from the previous inference algorithm.
:type variable_constants_file: json dict of {uuid: constant_primitive}
"""
def with_uuid_map(item, uuid_map):
if uuid_map is not None:
return uuid_map[item]
else:
return item
ip = InferenceParameters(context=context, dtype=dtype)
if parameters_file is not None:
old_params = ndarray.load(parameters_file)
mapped_params = {
with_uuid_map(k, uuid_map): v
for k, v in old_params.items()
}
new_paramdict = ParameterDict()
if current_params is not None:
new_paramdict.update(current_params)
# Do this because we need to map the uuids to the new Model
# before loading them into the ParamDict
for name, mapped_param in mapped_params.items():
new_paramdict[name]._load_init(mapped_param, ip.mxnet_context)
ip._params = new_paramdict
new_mxnet_constants = {}
new_variable_constants = {}
if variable_constants_file is not None:
import json
with open(variable_constants_file) as f:
old_constants = json.load(f)
new_variable_constants = {
with_uuid_map(k, uuid_map): v
for k, v in old_constants.items()
}
if mxnet_constants_file is not None:
new_mxnet_constants = {
with_uuid_map(k, uuid_map): v
for k, v in ndarray.load(mxnet_constants_file).items()
}
ip._constants = {}
ip._constants.update(new_variable_constants)
ip._constants.update(new_mxnet_constants)
return ip
def collect_internal_parameters(self):
"""
Return the parameters of the MXNet Gluon block that have *not* been set a prior distribution.
:returns: the parameters of the MXNet Gluon block without a prior distribution.
:rtype: MXNet.gluon.ParameterDict
"""
params = ParameterDict()
gluon_params = self.block.collect_params()
params.update({var_name: gluon_params[var_name] for var_name, var in self._gluon_parameters.items() if var.type == VariableType.PARAMETER})
return params
def __init__(self, input_channels, context, RF_in_units, conv_input_shape=(96,96), train_RF=False) -> None:
self._train_RF = train_RF
self._lossfun = Lossfun(alpha= 1, beta_vgg=100, beta_pix= 1, context=context)
self._rf_mapper = RFLayer(RF_in_units, conv_input_shape)
self._network = Network(3, input_channels)
params_to_train = ParameterDict()
if train_RF:
params_to_train.update(self._rf_mapper.collect_params())
params_to_train.update(self._network.collect_params())
self._trainer = Trainer(params_to_train, "adam", {"beta1": 0.5, "learning_rate": 0.0002})
def load_parameters(uuid_map=None,
mxnet_parameters=None,
variable_constants=None,
mxnet_constants=None,
context=None, dtype=None,
current_params=None):
"""
Loads back a set of InferenceParameters from files.
:param mxnet_parameters: These are the parameters of
the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_parameters: Dict of {uuid: mx.nd.array}
:param mxnet_constants: These are the constants in mxnet format
from the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants: Dict of {uuid: mx.nd.array}
:param variable_constants: These are the constants in
primitive format from the previous
inference algorithm.
:type variable_constants: dict of {uuid: constant primitive}
"""
def with_uuid_map(item, uuid_map):
if uuid_map is not None:
return uuid_map[item]
else:
return item
ip = InferenceParameters(context=context, dtype=dtype)
mapped_params = {with_uuid_map(k, uuid_map): v
for k, v in mxnet_parameters.items()}
new_paramdict = ParameterDict()
if current_params is not None:
new_paramdict.update(current_params)
# Do this because we need to map the uuids to the new Model
# before loading them into the ParamDict
for name, mapped_param in mapped_params.items():
new_paramdict[name]._load_init(mapped_param, ip.mxnet_context)
ip._params = new_paramdict
new_mxnet_constants = {}
new_variable_constants = {}
new_variable_constants = {with_uuid_map(k, uuid_map): v
for k, v in variable_constants.items()}
new_mxnet_constants = {with_uuid_map(k, uuid_map): v
for k, v in mxnet_constants.items()}
ip._constants = {}
ip._constants.update(new_variable_constants)
ip._constants.update(new_mxnet_constants)
return ip
def _get_decoder(self):
output = nn.HybridSequential()
with output.name_scope():
if self._tie_weights:
if self._shared_params is not None:
# self.embedding[0].params do not contain the bias, it
# may leave the decoder bias uninitialized. We resolve this
# issue by creating a new ParameterDict and stuffing
# every shared params into the ParameterDict.
shared_params = self.embedding[0].params
shared_params = ParameterDict(shared_params.prefix)
shared_params.update(self._shared_params)
output.add(nn.Dense(self._vocab_size, flatten=False,
params=shared_params))
else:
output.add(nn.Dense(self._vocab_size, flatten=False,
params=self.embedding[0].params))
else:
output.add(nn.Dense(self._vocab_size, flatten=False))
return output
def collect_pparams(self, select=None):
self._check_container_with_block()
ret = ParameterDict(self.pparams.prefix)
if not select:
ret.update(self.pparams)
else:
pattern = re.compile(select)
ret.update({
name: value
for name, value in self.pparams.items() if pattern.match(name)
})
for cld in self._children.values():
try:
ret.update(cld.collect_pparams(select=select))
except AttributeError:
pass
return ret
class InferenceParameters(object):
"""
The parameters and outcomes of an inference method.
InferenceParameters is a pool of memory that contains a mapping from uuid to two types of memories
(MXNet ParameterDict and Constants).
:param constants: Specify a list of model variables as constants
:type constants: {ModelComponent.uuid : mxnet.ndarray}
:param dtype: data type for internal numerical representation
:type dtype: {numpy.float64, numpy.float32, 'float64', 'float32'}
:param context: The MXNet context
:type context: {mxnet.cpu or mxnet.gpu}
"""
def __init__(self, constants=None, dtype=None, context=None):
self.dtype = dtype if dtype is not None else get_default_dtype()
self.mxnet_context = context if context is not None else get_default_device(
)
self._constants = {}
self._var_ties = {}
if constants is not None:
constant_uuids = {(k.uuid if isinstance(k, ModelComponent) else k):
v
for k, v in constants.items()}
self._constants.update(constant_uuids)
self._params = ParameterDict()
def update_constants(self, constants):
"""
Update the constants.
:param constants: The constants to be updated.
:type constants: {Variable: float or MXNet NDArray}
"""
self.constants.update({
(k.uuid if isinstance(k, ModelComponent) else k): v
for k, v in constants.items()
})
def initialize_params(self, graphs, observed_uuid):
"""
:param graphs: a list of graphs in which the parameters will be optimized.
:type graphs: a list of FactorGraph
:param observed_uuid: Parameter Variables that are passed in directly as data, not to be inferred.
:type observed_uuid: list, set
"""
if self._params is not None:
warnings.warn(
"InferenceParameters has already been initialized. The existing one will be overwritten."
)
self._params = ParameterDict()
for g in graphs:
# load in parameterdict from external gluon blocks.
for f in g.functions.values():
if isinstance(f, GluonFunctionEvaluation):
self._params.update(f.function.collect_gluon_parameters())
for var in g.get_constants():
self._constants[var.uuid] = var.constant
excluded = set(self._constants.keys()).union(observed_uuid)
for var in g.get_parameters(excluded=excluded,
include_inherited=False):
var_shape = realize_shape(var.shape, self._constants)
init = initializer.Constant(var.initial_value_before_transformation) \
if var.initial_value is not None else None
self._params.get(name=var.uuid,
shape=var_shape,
dtype=self.dtype,
allow_deferred_init=True,
init=init)
for m in g.modules.values():
m.initialize_hidden_parameters(self._params, excluded,
self._constants)
self._params.initialize(ctx=self.mxnet_context)
def initialize_with_carryover_params(self, graphs, observed_uuid, var_ties,
carryover_params):
"""
:param graphs: a list of graphs in which the parameters will be optimized.
:type graphs: a list of FactorGraph
:param observed_uuid: Parameter Variables that are passed in directly as data, not to be inferred.
:type observed_uuid: {UUID : mx.ndarray}
:param var_ties: A dictionary of variable maps that are tied together and use the MXNet Parameter of the dict
value's uuid.
:type var_ties: { UUID to tie from : UUID to tie to }
:param carryover_params: list of InferenceParameters containing the outcomes of previous inference algorithms.
:type carryover_params: [InferenceParameters]
"""
# TODO: var_ties is discarded at the moment.
var_uuid = set()
for g in graphs:
var_uuid = var_uuid.union(set(g.variables.keys()))
for m in g.modules.values():
var_uuid = var_uuid.union(set(m.hidden_parameters))
carryover_pairs = {}
for carryover in carryover_params:
for uuid, v in carryover.param_dict.items():
if uuid in var_uuid:
if uuid in carryover_pairs:
warnings.warn(
'The variable with UUID ' + uuid +
' exists in multiple carryover parameter sets.')
carryover_pairs[uuid] = v
# self._var_ties = var_ties.copy()
# for g in graphs:
# # TODO: check the behavior of var_ties in graph
# self._var_ties.update(g.var_ties)
# for v_uuid in self.constants:
# if v_uuid in self._var_ties:
# del self._var_ties[v_uuid]
observed_uuid = set(observed_uuid).union(carryover_pairs.keys())
self.initialize_params(graphs, observed_uuid)
# carryover_pairs = {
# to_var_uuid: carryover.param_dict[to_var_uuid]
# for from_var_uuid, to_var_uuid in self._var_ties.items()
# for carryover in carryover_params
# if to_var_uuid in carryover.param_dict}
self._params.update(carryover_pairs)
@property
def param_dict(self):
return self._params
@property
def constants(self):
return self._constants
@property
def var_ties(self):
return self._var_ties
def __getitem__(self, key, ctx=None):
if not isinstance(key, Variable):
raise KeyError(
"The access key of inference parameter needs to be Variable, but got "
+ str(type(key)) + ".")
pkey = key.inherited_name if key.isInherited else key.uuid
val = self._params.get(pkey).data(ctx)
if key.transformation is not None:
val = key.transformation.transform(val)
return val
def __setitem__(self, key, item):
if not isinstance(key, Variable):
raise KeyError(
"The access key of inference parameter needs to be Variable, but get "
+ str(type(key)) + ".")
if key.type == VariableType.PARAMETER:
if key.transformation is not None:
item = key.transformation.inverseTransform(item)
self._params.get(key.uuid).set_data(item)
elif key.type == VariableType.CONSTANT:
self._params.get(key.uuid)._value = item
# Override contains so that it doesn't use the __getitem__ method.
def __contains__(self, k):
return k in self.__dict__
@staticmethod
def load_parameters(uuid_map=None,
parameters_file=None,
variable_constants_file=None,
mxnet_constants_file=None,
context=None,
dtype=None,
current_params=None):
"""
Loads back a sest of InferenceParameters from files.
:param parameters_file: These are the parameters of the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants_file: file saved down with mx.nd.save(), so a {uuid: mx.nd.array} mapping saved
in a binary format.
:param mxnet_constants_file: These are the constants in mxnet format from the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants_file: file saved down with mx.nd.save(), so a {uuid: mx.nd.array} mapping saved
in a binary format.
:param variable_constants_file: These are the constants in primitive format from the previous
inference algorithm.
:type variable_constants_file: json dict of {uuid: constant_primitive}
"""
def with_uuid_map(item, uuid_map):
if uuid_map is not None:
return uuid_map[item]
else:
return item
ip = InferenceParameters(context=context, dtype=dtype)
if parameters_file is not None:
old_params = ndarray.load(parameters_file)
mapped_params = {
with_uuid_map(k, uuid_map): v
for k, v in old_params.items()
}
new_paramdict = ParameterDict()
if current_params is not None:
new_paramdict.update(current_params)
# Do this because we need to map the uuids to the new Model
# before loading them into the ParamDict
for name, mapped_param in mapped_params.items():
new_paramdict[name]._load_init(mapped_param, ip.mxnet_context)
ip._params = new_paramdict
new_mxnet_constants = {}
new_variable_constants = {}
if variable_constants_file is not None:
import json
with open(variable_constants_file) as f:
old_constants = json.load(f)
new_variable_constants = {
with_uuid_map(k, uuid_map): v
for k, v in old_constants.items()
}
if mxnet_constants_file is not None:
mxnet_constants = ndarray.load(mxnet_constants_file)
if isinstance(mxnet_constants, dict):
new_mxnet_constants = {
with_uuid_map(k, uuid_map): v
for k, v in mxnet_constants.items()
}
else:
new_mxnet_constants = {}
ip._constants = {}
ip._constants.update(new_variable_constants)
ip._constants.update(new_mxnet_constants)
return ip
def save(self, prefix):
"""
Saves the parameters and constants down to json files as maps from {uuid : value},
where value is an mx.ndarray for parameters and either primitive number types or mx.ndarray for constants.
Saves up to 3 files: prefix+["_params.json", "_variable_constants.json", "_mxnet_constants.json"]
:param prefix: The directory and any appending tag for the files to save this Inference as.
:type prefix: str , ex. "../saved_inferences/experiment_1"
"""
param_file = prefix + "_params.json"
variable_constants_file = prefix + "_variable_constants.json"
mxnet_constants_file = prefix + "_mxnet_constants.json"
to_save = {key: value._reduce() for key, value in self._params.items()}
ndarray.save(param_file, to_save)
mxnet_constants = {
uuid: value
for uuid, value in self._constants.items()
if isinstance(value, mx.ndarray.ndarray.NDArray)
}
ndarray.save(mxnet_constants_file, mxnet_constants)
variable_constants = {
uuid: value
for uuid, value in self._constants.items()
if uuid not in mxnet_constants
}
import json
with open(variable_constants_file, 'w') as f:
json.dump(variable_constants, f, ensure_ascii=False)
def train_pcbrpp(cfg, logprint=print):
cfg.ctx = mx.Context(cfg.device_type, cfg.device_id)
# ==========================================================================
# define train dataset, query dataset and test dataset
# ==========================================================================
traintransformer = ListTransformer(datasetroot=cfg.trainIMpath,
resize_size=cfg.resize_size,
crop_size=cfg.crop_size,
istrain=True)
querytransformer = Market1501_Transformer(datasetroot=cfg.queryIMpath,
resize_size=cfg.resize_size,
crop_size=cfg.crop_size,
istrain=False)
gallerytransformer = Market1501_Transformer(datasetroot=cfg.queryIMpath,
resize_size=cfg.resize_size,
crop_size=cfg.crop_size,
istrain=False)
traindataset = TextDataset(txtfilepath=cfg.trainList,
transform=traintransformer)
querydataset = TextDataset(txtfilepath=cfg.queryList,
transform=querytransformer)
gallerydataset = TextDataset(txtfilepath=cfg.galleryList,
transform=gallerytransformer)
train_iterator = DataLoader(traindataset,
num_workers=1,
shuffle=True,
last_batch='discard',
batch_size=cfg.batchsize)
query_iterator = DataLoader(querydataset,
num_workers=1,
shuffle=True,
last_batch='keep',
batch_size=cfg.batchsize)
gallery_iterator = DataLoader(gallerydataset,
num_workers=1,
shuffle=True,
last_batch='keep',
batch_size=cfg.batchsize)
def test_iterator():
for data in tqdm(query_iterator, ncols=80):
if isinstance(data, (tuple, list)):
data.append('query')
else:
data = (data, 'query')
yield data
for data in tqdm(gallery_iterator, ncols=80):
if isinstance(data, (tuple, list)):
data.append('gallery')
else:
data = (data, 'gallery')
yield data
# ==========================================================================
# ==========================================================================
# define model and trainer list, lr_scheduler
# ==========================================================================
Net = PCBRPPNet(basenetwork=cfg.basenet,
pretrained=cfg.base_pretrained,
feature_channels=cfg.feature_channels,
classes=cfg.classes_num,
laststride=cfg.laststride,
withpcb=cfg.withpcb,
partnum=cfg.partnum,
feature_weight_share=cfg.feature_weight_share,
withrpp=cfg.withrpp)
if cfg.pretrain_path is not None:
Net.load_params(cfg.pretrain_path,
ctx=mx.cpu(),
allow_missing=True,
ignore_extra=True)
Net.collect_params().reset_ctx(cfg.ctx)
trainers = []
if cfg.base_train:
base_params = Net.conv.collect_params()
base_optimizer_params = {
'learning_rate': cfg.base_learning_rate,
'wd': cfg.weight_decay,
'momentum': cfg.momentum,
'multi_precision': True
}
basetrainer = Trainer(base_params,
optimizer=cfg.optim,
optimizer_params=base_optimizer_params)
trainers.append(basetrainer)
if cfg.tail_train:
tail_params = ParameterDict()
if (not cfg.withpcb) or cfg.feature_weight_share:
tail_params.update(Net.feature.collect_params())
# tail_params.update(Net.feature_.collect_params())
tail_params.update(Net.classifier.collect_params())
else:
for pn in range(cfg.partnum):
tail_params.update(
getattr(Net, 'feature%d' % (pn + 1)).collect_params())
# tail_params.update(
# getattr(Net, 'feature%d_' % (pn+1)).collect_params())
tail_params.update(
getattr(Net, 'classifier%d' % (pn + 1)).collect_params())
tail_optimizer_params = {
'learning_rate': cfg.tail_learning_rate,
'wd': cfg.weight_decay,
'momentum': cfg.momentum,
'multi_precision': True
}
tailtrainer = Trainer(tail_params,
optimizer=cfg.optim,
optimizer_params=tail_optimizer_params)
trainers.append(tailtrainer)
if cfg.withrpp and cfg.rpp_train:
rpp_params = Net.rppscore.collect_params()
rpp_optimizer_params = {
'learning_rate': cfg.rpp_learning_rate,
'wd': cfg.weight_decay,
'momentum': cfg.momentum,
'multi_precision': True
}
rpptrainer = Trainer(rpp_params,
optimizer=cfg.optim,
optimizer_params=rpp_optimizer_params)
trainers.append(rpptrainer)
if len(trainers) == 0:
raise "There is no params for training."
lr_scheduler = MultiStepListScheduler(trainers,
milestones=cfg.milestones,
gamma=cfg.gamma)
# ==========================================================================
# ==========================================================================
# metric, loss, saver define
# ==========================================================================
softmax_cross_entropy = gluon.loss.SoftmaxCrossEntropyLoss()
loss_metric = Loss()
if cfg.partnum is not None:
train_accuracy_metrics = [Accuracy() for _ in range(cfg.partnum)]
else:
train_accuracy_metric = Accuracy()
reid_metric = ReID_Metric(isnorm=True)
save_name = ""
if not cfg.withpcb:
save_name = "IDE"
elif not cfg.withrpp:
save_name = "NORPP_%dPart" % (cfg.partnum)
else:
if not cfg.tail_train and not cfg.base_train:
save_name = "WITHRPP_%dPart" % (cfg.partnum)
if cfg.withpcb and cfg.feature_weight_share:
save_name += "_FEASHARE"
net_saver = Best_Evaluation_Saver(save_dir=cfg.snapdir,
save_name=save_name,
reverse=False)
# ==========================================================================
logprint(Net)
# ==========================================================================
# process functions
# ==========================================================================
def reset_metrics():
loss_metric.reset()
if cfg.partnum is not None:
for metric in train_accuracy_metrics:
metric.reset()
else:
train_accuracy_metric.reset()
reid_metric.reset()
def on_start(state):
pass
if state['train']:
state['store_iterator'] = state['iterator']
def on_start_epoch(state):
lr_scheduler.step()
reset_metrics()
if state['train']:
state['iterator'] = tqdm(state['store_iterator'], ncols=80)
def on_sample(state):
pass
def test_process(sample):
img, cam, label, ds = sample
img = img.as_in_context(cfg.ctx)
ID1, Fea1 = Net(img)
if cfg.partnum is not None:
Fea1 = ndarray.concat(*Fea1, dim=-1)
img = img.flip(axis=3)
ID2, Fea2 = Net(img)
if cfg.partnum is not None:
Fea2 = ndarray.concat(*Fea2, dim=-1)
return None, Fea1 + Fea2
def train_process(sample):
data, label = sample
data = data.as_in_context(cfg.ctx)
label = label.as_in_context(cfg.ctx)
with autograd.record():
with autograd.record(train_mode=cfg.base_train):
x = Net.base_forward(data)
if cfg.withpcb:
with autograd.record(train_mode=cfg.rpp_train):
x = Net.split_forward(x)
with autograd.record(train_mode=cfg.tail_train):
ID, Fea = Net.tail_forward(x)
# ID, Fea = Net(data)
if isinstance(ID, list):
losses = [softmax_cross_entropy(id_, label) for id_ in ID]
loss = ndarray.stack(*losses, axis=0).mean(axis=0)
else:
loss = softmax_cross_entropy(ID, label)
loss.backward()
for trainer in trainers:
trainer.step(data.shape[0])
return loss, ID
def on_forward(state):
if state['train']:
img, label = state['sample']
loss_metric.update(None, state['loss'])
if cfg.partnum is not None:
for metric, id_ in zip(train_accuracy_metrics,
state['output']):
metric.update(preds=id_, labels=label)
else:
train_accuracy_metric.update(preds=state['output'],
labels=label)
else:
img, cam, label, ds = state['sample']
if cfg.feature_norm:
fnorm = ndarray.power(state['output'], 2)
fnorm = ndarray.sqrt(ndarray.sum(fnorm, axis=-1,
keepdims=True))
state['output'] = state['output'] / fnorm
reid_metric.update(state['output'], cam, label, ds)
def on_end_iter(state):
pass
def on_end_epoch(state):
if state['train']:
logprint("[Epoch %d] train loss: %.6f" %
(state['epoch'], loss_metric.get()[1]))
if cfg.partnum is not None:
for idx, metric in enumerate(train_accuracy_metrics):
logprint("[Epoch %d] part No.%d train accuracy: %.2f%%" %
(state['epoch'], idx + 1, metric.get()[1] * 100))
else:
logprint(
"[Epoch %d] train accuracy: %.2f%%" %
(state['epoch'], train_accuracy_metric.get()[1] * 100))
if state['epoch'] % cfg.val_epochs == 0:
reset_metrics()
processor.test(test_process, test_iterator())
CMC, mAP = reid_metric.get()[1]
logprint(
"[Epoch %d] CMC1: %.2f%% CMC5: %.2f%% CMC10: %.2f%% CMC20: %.2f%% mAP: %.2f%%"
% (state['epoch'], CMC[0] * 100, CMC[4] * 100,
CMC[9] * 100, CMC[19] * 100, mAP * 100))
if state['epoch'] % cfg.snap_epochs == 0:
net_saver.save(Net, CMC[0])
def on_end(state):
pass
processor = EpochProcessor()
processor.hooks['on_start'] = on_start
processor.hooks['on_start_epoch'] = on_start_epoch
processor.hooks['on_sample'] = on_sample
processor.hooks['on_forward'] = on_forward
processor.hooks['on_end_iter'] = on_end_iter
processor.hooks['on_end_epoch'] = on_end_epoch
processor.hooks['on_end'] = on_end
processor.train(train_process, train_iterator, cfg.max_epochs)
class InferenceParameters(object):
"""
The parameters and outcomes of an inference method.
InferenceParameters is a pool of memory that contains a mapping from uuid to two types of memories
(MXNet ParameterDict and Constants).
:param constants: Specify a list of model variables as constants
:type constants: {ModelComponent.uuid : mxnet.ndarray}
:param dtype: data type for internal numerical representation
:type dtype: {numpy.float64, numpy.float32, 'float64', 'float32'}
:param context: The MXNet context
:type context: {mxnet.cpu or mxnet.gpu}
"""
def __init__(self, constants=None, dtype=None, context=None):
self.dtype = dtype if dtype is not None else get_default_dtype()
self.mxnet_context = context if context is not None else get_default_device()
self._constants = {}
self._var_ties = {}
if constants is not None:
constant_uuids = {
(k.uuid if isinstance(k, ModelComponent) else k): v
for k, v in constants.items()}
self._constants.update(constant_uuids)
self._params = ParameterDict()
def update_constants(self, constants):
"""
Update the constants.
:param constants: The constants to be updated.
:type constants: {Variable: float or MXNet NDArray}
"""
self.constants.update({
(k.uuid if isinstance(k, ModelComponent) else k): v
for k, v in constants.items()})
def initialize_params(self, graphs, observed_uuid):
"""
:param graphs: a list of graphs in which the parameters will be optimized.
:type graphs: a list of FactorGraph
:param observed_uuid: Parameter Variables that are passed in directly as data, not to be inferred.
:type observed_uuid: list, set
"""
if self._params is not None:
warnings.warn("InferenceParameters has already been initialized. The existing one will be overwritten.")
self._params = ParameterDict()
for g in graphs:
for var in g.get_constants():
self._constants[var.uuid] = var.constant
excluded = set(self._constants.keys()).union(observed_uuid)
for var in g.get_parameters(excluded=excluded):
var_shape = realize_shape(var.shape, self._constants)
init = initializer.Constant(var.initial_value_before_transformation) \
if var.initial_value is not None else None
self._params.get(name=var.uuid, shape=var_shape,
dtype=self.dtype,
allow_deferred_init=True, init=init)
for m in g.modules.values():
m.initialize_hidden_parameters(self._params, excluded, self._constants)
self._params.initialize(ctx=self.mxnet_context)
def initialize_with_carryover_params(self, graphs, observed_uuid, var_ties,
carryover_params):
"""
:param graphs: a list of graphs in which the parameters will be optimized.
:type graphs: a list of FactorGraph
:param observed_uuid: Parameter Variables that are passed in directly as data, not to be inferred.
:type observed_uuid: {UUID : mx.ndarray}
:param var_ties: A dictionary of variable maps that are tied together and use the MXNet Parameter of the dict
value's uuid.
:type var_ties: { UUID to tie from : UUID to tie to }
:param carryover_params: list of InferenceParameters containing the outcomes of previous inference algorithms.
:type carryover_params: [InferenceParameters]
"""
# TODO: var_ties is discarded at the moment.
var_uuid = set()
for g in graphs:
var_uuid = var_uuid.union(set(g.variables.keys()))
for m in g.modules.values():
var_uuid = var_uuid.union(set(m.hidden_parameters))
carryover_pairs = {}
for carryover in carryover_params:
for uuid, v in carryover.param_dict.items():
if uuid in var_uuid:
if uuid in carryover_pairs:
warnings.warn('The variable with UUID '+uuid+' exists in multiple carryover parameter sets.')
carryover_pairs[uuid] = v
# self._var_ties = var_ties.copy()
# for g in graphs:
# # TODO: check the behavior of var_ties in graph
# self._var_ties.update(g.var_ties)
# for v_uuid in self.constants:
# if v_uuid in self._var_ties:
# del self._var_ties[v_uuid]
observed_uuid = set(observed_uuid).union(carryover_pairs.keys())
self.initialize_params(graphs, observed_uuid)
# carryover_pairs = {
# to_var_uuid: carryover.param_dict[to_var_uuid]
# for from_var_uuid, to_var_uuid in self._var_ties.items()
# for carryover in carryover_params
# if to_var_uuid in carryover.param_dict}
self._params.update(carryover_pairs)
def fix_all(self):
for p in self.param_dict.values():
p.grad_req = 'null'
@property
def param_dict(self):
return self._params
@property
def constants(self):
return self._constants
@property
def var_ties(self):
return self._var_ties
def __getitem__(self, key, ctx=None):
if not isinstance(key, Variable):
raise KeyError("The access key of inference parameter needs to be Variable, but got "+str(type(key))+".")
val = self._params.get(key.uuid).data(ctx)
if key.transformation is not None:
val = key.transformation.transform(val)
return val
def __setitem__(self, key, item):
if not isinstance(key, Variable):
raise KeyError("The access key of inference parameter needs to be Variable, but get "+str(type(key))+".")
if key.type == VariableType.PARAMETER:
if key.transformation is not None:
item = key.transformation.inverseTransform(item)
self._params.get(key.uuid).set_data(item)
elif key.type == VariableType.CONSTANT:
self._params.get(key.uuid)._value = item
# Override contains so that it doesn't use the __getitem__ method.
def __contains__(self, k):
return k in self.__dict__
@staticmethod
def load_parameters(uuid_map=None,
mxnet_parameters=None,
variable_constants=None,
mxnet_constants=None,
context=None, dtype=None,
current_params=None):
"""
Loads back a set of InferenceParameters from files.
:param mxnet_parameters: These are the parameters of
the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_parameters: Dict of {uuid: mx.nd.array}
:param mxnet_constants: These are the constants in mxnet format
from the previous inference algorithm.
These are in a {uuid: mx.nd.array} mapping.
:type mxnet_constants: Dict of {uuid: mx.nd.array}
:param variable_constants: These are the constants in
primitive format from the previous
inference algorithm.
:type variable_constants: dict of {uuid: constant primitive}
"""
def with_uuid_map(item, uuid_map):
if uuid_map is not None:
return uuid_map[item]
else:
return item
ip = InferenceParameters(context=context, dtype=dtype)
mapped_params = {with_uuid_map(k, uuid_map): v
for k, v in mxnet_parameters.items()}
new_paramdict = ParameterDict()
if current_params is not None:
new_paramdict.update(current_params)
# Do this because we need to map the uuids to the new Model
# before loading them into the ParamDict
for name, mapped_param in mapped_params.items():
new_paramdict[name]._load_init(mapped_param, ip.mxnet_context)
ip._params = new_paramdict
new_mxnet_constants = {}
new_variable_constants = {}
new_variable_constants = {with_uuid_map(k, uuid_map): v
for k, v in variable_constants.items()}
new_mxnet_constants = {with_uuid_map(k, uuid_map): v
for k, v in mxnet_constants.items()}
ip._constants = {}
ip._constants.update(new_variable_constants)
ip._constants.update(new_mxnet_constants)
return ip
def get_serializable(self):
"""
Returns three dicts:
1. MXNet parameters {uuid: mxnet parameters, mx.nd.array}.
2. MXNet constants {uuid: mxnet parameter (only constant types), mx.nd.array}
3. Other constants {uuid: primitive numeric types (int, float)}
:returns: Three dictionaries: MXNet parameters, MXNet constants, and other constants (in that order)
:rtypes: {uuid: mx.nd.array}, {uuid: mx.nd.array}, {uuid: primitive (int/float)}
"""
mxnet_parameters = {key: value._reduce() for key, value in self._params.items()}
mxnet_constants = {uuid: value
for uuid, value in self._constants.items()
if isinstance(value, mx.ndarray.ndarray.NDArray)}
variable_constants = {uuid: value
for uuid, value in self._constants.items()
if uuid not in mxnet_constants}
return mxnet_parameters, mxnet_constants, variable_constants