def val_dataloader(self):
bs = BatchSampler(
RandomSampler(self.test_buffer,
replacement=True,
num_samples=self.hparams['num_val_batches'] *
self.hparams['batch_size']),
batch_size=self.hparams['batch_size'],
drop_last=False)
return DataLoader(self.test_buffer, batch_sampler=bs)
def train_dataloader(self):
bs = BatchSampler(
RandomSampler(self.train_buffer,
replacement=True,
num_samples=self.hparams['num_grad_steps'] *
self.hparams['batch_size']),
batch_size=self.hparams['batch_size'],
drop_last=False)
return DataLoader(self.train_buffer, batch_sampler=bs)
def mean_importance(model, dataset, loss, batch_size, bar=False):
'''
Calculate feature importance by measuring performance reduction when
features are imputed with their mean value.
Args:
model: sklearn model.
dataset: PyTorch dataset, such as data.utils.TabularDataset.
loss: string descriptor of loss function ('mse', 'cross entropy').
batch_size: number of examples to be processed at once.
bar: whether to display progress bar.
'''
# Add wrapper if necessary.
if isinstance(model, sklearn.base.ClassifierMixin):
model = SklearnClassifierWrapper(model)
# Setup.
input_size = dataset.input_size
loader = DataLoader(dataset,
batch_sampler=BatchSampler(SequentialSampler(dataset),
batch_size=batch_size,
drop_last=False))
loss_fn = utils.get_loss_np(loss, reduction='none')
scores = []
# Performance with all features.
base_loss = validate_sklearn(model, loader,
utils.get_loss_np(loss, reduction='mean'))
# For imputing with mean.
imputation = utils.ReferenceImputation(
torch.mean(torch.tensor(dataset.data), dim=0))
if bar:
bar = tqdm(total=len(dataset) * input_size)
for ind in range(input_size):
# Setup.
score = 0
N = 0
for x, y in loader:
# Impute with mean and make predictions.
n = len(x)
y_hat = model.predict(
imputation.impute_ind(x, ind).cpu().data.numpy())
# Measure loss and compute average.
loss = np.mean(loss_fn(y_hat, y.cpu().data.numpy()))
score = (score * N + loss * n) / (N + n)
N += n
if bar:
bar.update(n)
scores.append(score)
return np.stack(scores) - base_loss
def __init__(self,
dataset,
batch_size=1,
shuffle=False,
sampler=None,
batch_sampler=None,
num_workers=0,
collate_fn=default_collate,
pin_memory=False,
drop_last=False,
timeout=0,
worker_init_fn=None,
multiton_id=0):
self.dataset = dataset
self.batch_size = batch_size
self.num_workers = num_workers
self.collate_fn = collate_fn
self.pin_memory = pin_memory
self.drop_last = drop_last
self.timeout = timeout
self.worker_init_fn = worker_init_fn
self.multiton_id = multiton_id
if timeout < 0:
raise ValueError('timeout option should be non-negative')
if batch_sampler is not None:
if batch_size > 1 or shuffle or sampler is not None or drop_last:
raise ValueError('batch_sampler option is mutually exclusive '
'with batch_size, shuffle, sampler, and '
'drop_last')
self.batch_size = None
self.drop_last = None
if sampler is not None and shuffle:
raise ValueError('sampler option is mutually exclusive with '
'shuffle')
if self.num_workers < 0:
raise ValueError('num_workers option cannot be negative; '
'use num_workers=0 to disable multiprocessing.')
if batch_sampler is None:
if sampler is None:
if shuffle:
sampler = RandomSampler(dataset)
else:
sampler = SequentialSampler(dataset)
batch_sampler = BatchSampler(sampler, batch_size, drop_last)
self.sampler = sampler
self.batch_sampler = batch_sampler
self.dataiter = _DataLoaderIter(self.num_workers, self.pin_memory,
self.timeout, self.worker_init_fn,
self.multiton_id)
self.__initialized = True
def init_loaders(self, sample_keys=None):
"""
Method that converts data and labels to instances of class torch.utils.data.DataLoader
Returns:
a dictionary with the same keys as data_dict and label_dict.
Each element of the dictionary is an instance of torch.utils.data.DataLoader
that yields paired elements of data and labels
"""
# Convert the data to Dataset
dataset_dict = self.init_datasets()
# If the Dataset implements collate_fn, that is used. Otherwise, default_collate is used
if hasattr(dataset_dict["train"], "collate_fn") and callable(
getattr(dataset_dict["train"], "collate_fn")):
collate_fn = dataset_dict["train"].collate_fn
else:
collate_fn = default_collate
# If 'iters_per_epoch' is defined, then a fixed number of random sample batches from the training set
# are drawn per epoch.
# Otherwise, an epoch is defined by a full run through all of the data in the dataloader.
if self.config_dict.get("iters_per_epoch") is not None:
num_samples = (self.config_dict["iters_per_epoch"] *
self.config_dict["batch_size"])
if sample_keys is None:
sample_keys = ["train"]
else:
if sample_keys is None:
sample_keys = []
loaders_dict = {}
for key in dataset_dict.keys():
if key in sample_keys:
loaders_dict[key] = DataLoader(
dataset_dict[key],
batch_sampler=BatchSampler(
RandomSampler(dataset_dict[key],
replacement=True,
num_samples=num_samples),
batch_size=self.config_dict["batch_size"],
drop_last=False,
),
collate_fn=collate_fn,
num_workers=self.num_workers,
pin_memory=True,
)
else:
loaders_dict[key] = DataLoader(
dataset_dict[key],
batch_size=self.config_dict["batch_size"],
collate_fn=collate_fn,
num_workers=self.num_workers,
pin_memory=True,
)
return loaders_dict
def init_dataloader(dataset, batch_size=32, random=True):
sampler = RandomSampler(dataset) if random else SequentialSampler(dataset)
batch_sampler = BatchSampler(sampler,
batch_size=batch_size,
drop_last=False)
loader = DataLoader(dataset,
batch_sampler=batch_sampler,
collate_fn=dataset.collater,
num_workers=4)
return loader
def build_dataloader(dataset:Dataset, batch_size:int, sequential:bool=True) -> DataLoader:
if sequential:
sampler = SequentialSampler(dataset)
else:
sampler = RandomSampler(dataset, replacement=True)
batch_sampler = BatchSampler(sampler, batch_size, drop_last=False)
dataloader = DataLoader(dataset, batch_sampler=batch_sampler)
return dataloader
def __call__(self, inputs: List[List[str or int]]
or List[Tuple[List[str or int], Any]], *args):
dataset = MapStyleDataset(inputs, self.min_seq_len, self.max_seq_len)
batch_sampler = BatchSampler(self.sampler(dataset),
batch_size=self.batch_size,
drop_last=self.drop_last)
loader = DataLoader(dataset,
batch_sampler=batch_sampler,
collate_fn=dataset.batch_sequences)
return loader
def __iter__(self):
if self.generator is None:
self.generator = torch.Generator().manual_seed(self.initial_seed)
self.sample_task_indices()
self.create_sampler()
self.batch_sampler = BatchSampler(self.sampler, batch_size=self.batch_size, drop_last=self.drop_last)
self.iter_sampler = iter(self.batch_sampler)
self.is_first_batch = True
self.current_task_iteration += 1
return self
def __iter__(self):
smp = RandomSampler(torch.arange(self.n_chunks))
for top in BatchSampler(smp, self.batch_size,
False): # don't drop last!
offsets = torch.randint(0, self.remainder, (self.batch_size, ))
top = tuple(o + (t * self.chunk_length)
for t, o in zip(top, offsets))
for start in range(self.n_per_chunk):
# start indices of the batch
yield tuple(t + (start * self.seq_len) for t in top)
def __init__(self,
dataset,
batch_size,
negative_sampling=False,
num_sampling_users=0,
num_workers=0,
collate_fn=None):
self.dataset = dataset # type: RecommendationDataset
self.num_sampling_users = num_sampling_users
self.num_workers = num_workers
self.batch_size = batch_size
self.negative_sampling = negative_sampling
if self.num_sampling_users == 0:
self.num_sampling_users = batch_size
assert self.num_sampling_users >= batch_size, 'num_sampling_users should be at least equal to the batch_size'
self.batch_collator = BatchCollator(
batch_size=self.batch_size,
negative_sampling=self.negative_sampling)
# Wrapping a BatchSampler within a BatchSampler
# in order to fetch the whole mini-batch at once
# from the dataset instead of fetching each sample on its own
batch_sampler = BatchSampler(BatchSampler(
RandomSampler(dataset),
batch_size=self.num_sampling_users,
drop_last=False),
batch_size=1,
drop_last=False)
if collate_fn is None:
self._collate_fn = self.batch_collator.collate
self._use_default_data_generator = True
else:
self._collate_fn = collate_fn
self._use_default_data_generator = False
self._dataloader = DataLoader(dataset,
batch_sampler=batch_sampler,
num_workers=num_workers,
collate_fn=self._collate)
def test_batch_up_image_loader_with_batch_sampler(image):
batch_size = 3
dataset = ()
batch_sampler = BatchSampler(SequentialSampler(dataset),
batch_size,
drop_last=False)
loader = DataLoader(dataset, batch_sampler=batch_sampler)
batched_up_image = utils.batch_up_image(image, loader=loader)
assert extract_batch_size(batched_up_image) == batch_size
def __init__(self, samplers, batch_size):
for sampler in samplers:
if not isinstance(sampler, Sampler):
raise ValueError("sampler should be an instance of torch.utils.data.Sampler, but got sampler={}".format(sampler))
if not isinstance(batch_size, _int_classes) or isinstance(batch_size, bool) or batch_size <= 0:
raise ValueError("batch_size should be a positive integeral value, but got batch_size={}".format(batch_size))
self.samplers = samplers
self.batch_size = batch_size
self.batch_samplers = [BatchSampler(sampler, self.batch_size, True) for sampler in self.samplers]
def get_val_dataloader(source='scientsbank', origin='answer'):
dataset = ds.SemEvalDataset('data/flat_semeval5way_test.csv')
dataset.to_val_mode(source, origin)
sampler = SequentialSampler(dataset)
batch_sampler = BatchSampler(sampler, batch_size=1, drop_last=False)
loader = DataLoader(dataset,
batch_sampler=batch_sampler,
collate_fn=dataset.collater,
num_workers=4)
return loader
def __init__(self,
sampler,
batch_size,
shuffle_batches=False,
drop_incomplete=False):
batches = [
batch
for batch in BatchSampler(sampler, batch_size, drop_incomplete)
]
super().__init__(batches, shuffle_batches)
def load_data(pkl_paths,
use_attr,
no_img,
batch_size,
uncertain_label=False,
n_class_attr=2,
image_dir='images',
resampling=False,
resol=299):
"""
Note: Inception needs (299,299,3) images with inputs scaled between -1 and 1
Loads data with transformations applied, and upsample the minority class if there is class imbalance and weighted loss is not used
NOTE: resampling is customized for first attribute only, so change sampler.py if necessary
"""
resized_resol = int(resol * 256 / 224)
is_training = any(['train.pkl' in f for f in pkl_paths])
if is_training:
transform = transforms.Compose([
#transforms.Resize((resized_resol, resized_resol)),
#transforms.RandomSizedCrop(resol),
transforms.ColorJitter(brightness=32 / 255, saturation=(0.5, 1.5)),
transforms.RandomResizedCrop(resol),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(), #implicitly divides by 255
transforms.Normalize(mean=[0.5, 0.5, 0.5], std=[2, 2, 2])
#transforms.Normalize(mean = [ 0.485, 0.456, 0.406 ], std = [ 0.229, 0.224, 0.225 ]),
])
else:
transform = transforms.Compose([
#transforms.Resize((resized_resol, resized_resol)),
transforms.CenterCrop(resol),
transforms.ToTensor(), #implicitly divides by 255
transforms.Normalize(mean=[0.5, 0.5, 0.5], std=[2, 2, 2])
#transforms.Normalize(mean = [ 0.485, 0.456, 0.406 ], std = [ 0.229, 0.224, 0.225 ]),
])
dataset = CUBDataset(pkl_paths, use_attr, no_img, uncertain_label,
image_dir, n_class_attr, transform)
if is_training:
drop_last = True
shuffle = True
else:
drop_last = False
shuffle = False
if resampling:
sampler = BatchSampler(ImbalancedDatasetSampler(dataset),
batch_size=batch_size,
drop_last=drop_last)
loader = DataLoader(dataset, batch_sampler=sampler)
else:
loader = DataLoader(dataset,
batch_size=batch_size,
shuffle=shuffle,
drop_last=drop_last)
return loader
def unsupervised_dataloaders(seed=123,
val_portion=0.1,
test_portion=0.1,
device=None,
mean_adjustment=False,
normalization=False):
'''
Create dataloaders with no label information (for self reconstruction).
Args:
seed: for shuffling dataset.
val_portion: portion for validation.
test_portion: portion for test.
mean_adjustment: whether to adjust x for mean.
normalization: whether to adjust x for standard deviation.
device: device for torch.Tensors.
'''
# Load data.
data = sio.loadmat('Mouse-V1-ALM-20180520_thr_7-5.mat')
lopge = data['lOPGE']
# Split data.
train, val, test = split_data(lopge,
seed=seed,
val_portion=val_portion,
test_portion=test_portion)
# Calculate mean and std from training data.
train_mean = np.mean(train, axis=0)
train_std = np.std(train, axis=0)
mean = train_mean if mean_adjustment else 0
std = train_std if normalization else 1
train_mean = torch.tensor(train_mean, device=device, dtype=torch.float32)
train_std = torch.tensor(train_std, device=device, dtype=torch.float32)
# Calculate total variance.
full_mean = np.mean(lopge, axis=0, keepdims=True)
total_variance = np.mean(np.sum((lopge - full_mean)**2, axis=1))
# Create datasets.
train_set = RNASeq(train, mean=mean, std=std, device=device)
val_set = RNASeq(val, mean=mean, std=std, device=device)
test_set = RNASeq(test, mean=mean, std=std, device=device)
# Create data loaders.
random_sampler = RandomSampler(train_set, replacement=True)
batch_sampler = BatchSampler(random_sampler,
batch_size=512,
drop_last=True)
train_loader = DataLoader(train_set, batch_sampler=batch_sampler)
val_loader = DataLoader(val_set, batch_size=len(val))
test_loader = DataLoader(test_set, batch_size=len(test))
return (train_loader, val_loader, test_loader, train_mean, train_std,
total_variance)
def eval_model(self, gen, batch_size):
n = len(gen.playids)
batches = BatchSampler(SequentialSampler(range(n)), batch_size=batch_size, drop_last=False)
l = 0
for batch in batches:
xbatch, ybatch = gen.get_features(batch)
self.eval()
loss = self.compute_loss(xbatch, ybatch)
l += len(batch)*loss
l /= n
return l
def train_epochs(self, nepochs, gen):
for _ in range(nepochs):
len(gen.playids)
batches = BatchSampler(RandomSampler(range(len(gen.playids))), batch_size=self.batch_size, drop_last=False)
for batch in batches:
self.train()
xbatch, ybatch = gen.get_features(batch)
loss = self.compute_loss(xbatch, ybatch)
self.optimizer.zero_grad()
loss.backward()
self.optimizer.step()
def __init__(self,
sampler,
batch_size,
drop_last,
sort_key,
bucket_size_multiplier=100):
super().__init__(sampler, batch_size, drop_last)
self.sort_key = sort_key
self.bucket_sampler = BatchSampler(
sampler, min(batch_size * bucket_size_multiplier, len(sampler)),
False)
def test_index_batch_sampler(tmpdir):
"""Test `IndexBatchSampler` properly extracts indices."""
dataset = range(15)
sampler = SequentialSampler(dataset)
batch_sampler = BatchSampler(sampler, 3, False)
index_batch_sampler = IndexBatchSamplerWrapper(batch_sampler)
assert batch_sampler.batch_size == index_batch_sampler.batch_size
assert batch_sampler.drop_last == index_batch_sampler.drop_last
assert batch_sampler.sampler is sampler
assert list(index_batch_sampler) == index_batch_sampler.seen_batch_indices
def __init__(self, dataset, batch_size):
super().__init__(None)
self.epoch = 0
self.dataset = dataset
self.batch_size = batch_size
# Assume that data in dataset is sorted w.r. to duration
self.batches = list(
BatchSampler(SequentialSampler(self.dataset),
batch_size=self.batch_size,
drop_last=False))
def train_valid_loader(self, mnist_dataset):
batch_size = 100
train_indices, valid_indices = mnist_dataset.get_train_and_validation_set_indices(
train_valid_split_ratio=0.8, seed=2)
train_loader = DatasetLoader(
mnist_dataset,
batch_sampler=BatchSampler(
sampler=SubsetRandomSampler(train_indices),
batch_size=batch_size,
drop_last=False),
collate_fn=DatasetLoader.square_matrix_collate_fn)
valid_loader = DatasetLoader(
mnist_dataset,
batch_sampler=BatchSampler(
sampler=SubsetRandomSampler(valid_indices),
batch_size=batch_size,
drop_last=False),
collate_fn=DatasetLoader.square_matrix_collate_fn)
yield train_loader, valid_loader
def __init__(self, X, Y, kern, minibatch_size=None, n_filters=256, name: str = None):
super(ConvNet, self).__init__(name=name)
if not hasattr(kern, 'W_'):
# Create W_ and b_ as attributes in kernel
X_zeros = np.zeros([1] + kern.input_shape)
_ = kern.equivalent_BNN(
X=torch.zeros([1] + kern.input_shape),
n_samples=1,
n_filters=n_filters)
self._kern = kern
# Make MiniBatches if necessary
if minibatch_size is None:
self.train_inputs = X
self.train_targets = Y
self.scale_factor = 1.
else:
self.train_inputs = torch.Tensor(list(BatchSampler(SequentialSampler(X), batch_size=minibatch_siz, drop_last=False)))
self.train_targets = torch.Tensor(list(BatchSampler(SequentialSampler(Y), batch_size=minibatch_siz, drop_last=False)))
self.scale_factor = X.shape[0] / minibatch_size
self.n_labels = int(np.max(Y)+1)
# Create GPFlow parameters with the relevant size of the network
Ws, bs = [], []
for i, (W, b) in enumerate(zip(kern._W, kern._b)):
if i == kern.n_layers:
W_shape = [int(W.shape[1]), self.n_labels]
b_shape = [self.n_labels]
else:
W_shape = list(map(int, W.shape[1:]))
b_shape = [n_filters]
W_var = kern.var_weight.read_value()/W_shape[-2]
b_var = kern.var_bias.read_value()
W_init = np.sqrt(W_var) * np.random.randn(*W_shape)
b_init = np.sqrt(b_var) * np.random.randn(*b_shape)
Ws.append(W_init) #, prior=ZeroMeanGauss(W_var)))
bs.append(b_init) #, prior=ZeroMeanGauss(b_var)))
# self.Ws = gpflow.params.ParamList(Ws)
# self.bs = gpflow.params.ParamList(bs)
self.register_parameter(name='Ws',parameter=torch.nn.Parameter(Ws),prior=None)
self.register_parameter(name='bs',parameter=torch.nn.Parameter(bs),prior=None)
def __init__(
self,
dataset,
batch_size=1,
shuffle=False,
sampler=None,
batch_sampler=None,
num_workers=0,
collate_fn=default_collate,
pin_memory=False,
drop_last=False,
timeout=0,
worker_init_fn=None,
):
self.dataset = dataset
self.batch_size = batch_size
self.num_workers = num_workers
self.collate_fn = collate_fn
self.pin_memory = pin_memory
self.drop_last = drop_last
self.timeout = timeout
self.worker_init_fn = worker_init_fn
if timeout < 0:
raise ValueError("timeout option should be non-negative")
if batch_sampler is not None:
if batch_size > 1 or shuffle or sampler is not None or drop_last:
raise ValueError("batch_sampler option is mutually exclusive "
"with batch_size, shuffle, sampler, and "
"drop_last")
self.batch_size = None
self.drop_last = None
if sampler is not None and shuffle:
raise ValueError("sampler option is mutually exclusive with "
"shuffle")
if self.num_workers < 0:
raise ValueError("num_workers option cannot be negative; "
"use num_workers=0 to disable multiprocessing.")
if batch_sampler is None:
if sampler is None:
if shuffle:
sampler = RandomSampler(dataset)
else:
sampler = SequentialSampler(dataset)
batch_sampler = BatchSampler(sampler, batch_size, drop_last)
self.sampler = sampler
self.batch_sampler = batch_sampler
self.__initialized = True
def __init__(self, config, lmdb_path, train=True):
self.config = config
transform = transforms.Compose([transforms.ToTensor()])
augmentation_methods = []
if train:
if self.config.noise_augmentation:
augmentation_methods.append(augmentation.add_noise)
if self.config.contrast_augmentation:
augmentation_methods.append(augmentation.change_contrast)
if self.config.pose_mean is not None:
pose_label_transform = self.normalize_pose_labels
else:
pose_label_transform = None
self._dataset = LMDB(config, lmdb_path, transform,
pose_label_transform, augmentation_methods)
if not train and config.distributed:
batch_size = 1
else:
batch_size = config.batch_size
if config.distributed:
self._sampler = DistributedSampler(self._dataset)
if train:
self._sampler = BatchSampler(self._sampler,
batch_size,
drop_last=True)
super(LMDBDataLoader, self).__init__(
self._dataset,
batch_sampler=self._sampler,
pin_memory=config.pin_memory,
num_workers=config.workers,
collate_fn=collate_fn,
)
else:
super(LMDBDataLoader, self).__init__(
self._dataset,
batch_size=batch_size,
shuffle=train,
pin_memory=config.pin_memory,
num_workers=config.workers,
drop_last=True,
collate_fn=collate_fn,
)
def fit(self, zeta, xu, nb_iter=100, batch_size=None, lr=1.e-3):
self.optim = Adam(self.parameters(), lr=lr)
batch_size = xu.shape[0] if batch_size is None else batch_size
batches = list(BatchSampler(SubsetRandomSampler(range(xu.shape[0])), batch_size, False))
for n in range(nb_iter):
for batch in batches:
self.optim.zero_grad()
loss = - self.elbo(zeta[batch], xu[batch])
loss.backward()
self.optim.step()
def return_dataloaders(self, batch_size, num_workers = 0): #Perhaps rewrite this using return_dataloader method
from torch.utils.data import BatchSampler, DataLoader, SequentialSampler, RandomSampler
if self.reweighter:
N_targets = len(self.targets.split(', '))
def collate(batch):
batch = Batch.from_data_list(batch[0])
batch.weight = self.reweighter(batch)#torch.tensor(self.reweighter.predict_weights(batch.y.view(-1,N_targets))).view(-1,1)
return batch
else:
def collate(batch):
return Batch.from_data_list(batch[0])
train_loader = DataLoader(dataset = self.train(),
collate_fn = collate,
num_workers = num_workers,
# persistent_workers=True,
pin_memory = True,
sampler = BatchSampler(RandomSampler(self.train()),
batch_size=batch_size,
drop_last=False))
test_loader = DataLoader(dataset = self.test(extra_targets = ', energy_log10'),
collate_fn = collate,
num_workers = num_workers,
# persistent_workers=True,
pin_memory = True,
sampler = BatchSampler(SequentialSampler(self.test(extra_targets = ', energy_log10')),
batch_size=batch_size,
drop_last=False))
val_loader = DataLoader(dataset = self.val(),
collate_fn = collate,
num_workers = num_workers,
# persistent_workers=True,
pin_memory = True,
sampler = BatchSampler(RandomSampler(self.val()),
batch_size=batch_size,
drop_last=False))
return train_loader, test_loader, val_loader
def train(self, memory: Memory):
# train over training data
obs, action, reward, done = memory.get('obs', 'action', 'reward',
'done')
old_mean, old_logstd, old_value = memory.get('mean', 'logstd', 'value')
# compute advantages
advantage = generalized_advantage_estimation(reward, old_value, done)
advantage = (advantage - advantage.mean()) / (advantage.std() + 1e-8)
# compute target values
target_value = discounted_reward(reward, done)
policy_losses = torch.zeros(self.NUM_TRAIN_EPOCHS)
entropies = torch.zeros(self.NUM_TRAIN_EPOCHS)
value_losses = torch.zeros(self.NUM_TRAIN_EPOCHS)
for i_epoch in range(self.NUM_TRAIN_EPOCHS):
for indices in BatchSampler(SubsetRandomSampler(range(
obs.shape[0])),
self.TRAIN_BATCH_SIZE,
drop_last=True):
new_mean, new_logstd, new_value = self.model(obs[indices])
policy_loss, entropy = ppo_loss(old_mean[indices],
old_logstd[indices], new_mean,
new_logstd, action[indices],
advantage[indices])
value_loss = (target_value[indices] - new_value).pow(2).mean()
loss = policy_loss - self.ENTROPY_COEF * entropy + value_loss
self.optimizer.zero_grad()
loss.backward()
self.optimizer.step()
policy_losses[i_epoch] += policy_loss
entropies[i_epoch] += entropy
value_losses[i_epoch] += value_loss
print(f'{self.world_rank} {self.rank} Rewards {reward.sum().item()}',
flush=True)
print(
f'{self.world_rank} {self.rank} Policy {policy_losses.detach().numpy()}',
flush=True)
print(
f'{self.world_rank} {self.rank} Value {value_losses.detach().numpy()}',
flush=True)
print(
f'{self.world_rank} {self.rank} Entropy {entropies.detach().numpy()}',
flush=True)
def train(self, batch_size=6):
# Unroll rewards
rewards = np.array(self.rewards)
reward = 0
for i in reversed(range(len(self.rewards))):
rewards[i] += self.gamma * reward
reward = rewards[i]
states = torch.tensor(self.states, dtype=torch.float)
actions = torch.tensor(self.actions, dtype=torch.long).view(-1, 1)
rewards = rewards.reshape(-1, 1)
losses = []
entropies = []
# Deprecated (LR is now fixed within the net)
if self._adapt_lr_on_ep_len:
self.episode_lengths.append(len(self.rewards))
# calcular LR
avg_length_window = np.mean(self.episode_lengths[-100:])
exp = -0.02 * avg_length_window - 2
learning_rate = 10**exp
else:
learning_rate = self.lr
for batch in BatchSampler(SubsetRandomSampler(range(len(self.states))),
batch_size,
drop_last=False):
states_batch = states[batch].numpy()
actions_batch = actions[batch].numpy()
rewards_batch = rewards[batch]
loss = []
entropy = []
for state, action, reward in zip(states_batch, actions_batch,
rewards_batch):
state = state.reshape((-1, 1))
probs = self.net.forward(state)
probs = probs.squeeze() + 1e-8
entropy.append(-np.sum(np.log(probs) * probs))
action_prob = probs[action]
loss.append(-(np.log(action_prob) * reward))
dLoss = 1 / action_prob * reward
self.net.backward(dLoss, action)
losses.append(np.mean(loss))
entropies.append(np.mean(entropy))
self.net.mean_grads(batch_size)
self.net.update()
self._clear_buffers()
return np.mean(losses), np.mean(entropies), self.lr