def __init__(self, conf: Dict, word_batch: WordBatch,
char_batch: CharacterBatch, n_class: int):
super(Model, self).__init__(conf, word_batch, char_batch)
self.dropout = torch.nn.Dropout(conf['dropout'])
c = conf['classifier']
classify_layer_name = c['name'].lower()
if classify_layer_name == 'softmax':
self.classify_layer = SoftmaxLoss(self.output_dim, n_class)
elif classify_layer_name == 'cnn_softmax':
raise NotImplementedError('cnn_softmax is not ready.')
elif classify_layer_name == 'sampled_softmax':
sparse = conf['optimizer']['type'].lower() in ('sgd', 'adam',
'dense_sparse_adam')
self.classify_layer = SampledSoftmaxLoss(n_class,
self.output_dim,
c['n_samples'],
sparse=sparse)
elif classify_layer_name == 'window_sampled_softmax':
sparse = conf['optimizer']['type'].lower() in ('sgd', 'adam',
'dense_sparse_adam')
self.classify_layer = WindowSampledSoftmaxLoss(n_class,
self.output_dim,
c['n_samples'],
sparse=sparse)
else:
raise ValueError(
'Unknown classify_layer: {}'.format(classify_layer_name))
def test_sampled_softmax_can_run(self):
softmax = SampledSoftmaxLoss(num_words=1000, embedding_dim=12, num_samples=50)
# sequence_length, embedding_dim
embedding = torch.rand(100, 12)
targets = torch.randint(0, 1000, (100,)).long()
_ = softmax(embedding, targets)
def __init__(self,
vocab: Vocabulary,
seq_embedder: TextFieldEmbedder,
abstract_text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
calculate_recall: bool = False,
use_abstracts: bool = True,
use_node_vectors: bool = True,
num_samples: int = None,
dropout: float = None) -> None:
super().__init__(vocab)
self._abstract_text_field_embedder = abstract_text_field_embedder
self._use_abstracts = use_abstracts
self._use_node_vectors = use_node_vectors
self._seq_embedder = seq_embedder
self._calculate_recall = calculate_recall
# lstm encoder uses PytorchSeq2SeqWrapper for pytorch lstm
self._contextualizer = contextualizer
self._forward_dim = contextualizer.get_output_dim()
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=False)
else:
self._softmax_loss = _SoftmaxLoss(num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim)
self._n_list = range(1, 50)
self._recall_at_n = {}
for n in self._n_list:
self._recall_at_n[n] = RecallAtN(n)
self._perplexity = Perplexity()
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
def __init__(
self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
dropout: float = None,
num_samples: int = None,
sparse_embeddings: bool = False,
bidirectional: bool = False,
initializer: InitializerApplicator = None,
**kwargs,
) -> None:
super().__init__(vocab, **kwargs)
self._text_field_embedder = text_field_embedder
if contextualizer.is_bidirectional() is not bidirectional:
raise ConfigurationError(
"Bidirectionality of contextualizer must match bidirectionality of "
"language model. "
f"Contextualizer bidirectional: {contextualizer.is_bidirectional()}, "
f"language model bidirectional: {bidirectional}")
self._contextualizer = contextualizer
self._bidirectional = bidirectional
# The dimension for making predictions just in the forward
# (or backward) direction.
if self._bidirectional:
self._forward_dim = contextualizer.get_output_dim() // 2
else:
self._forward_dim = contextualizer.get_output_dim()
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size("transactions"),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=sparse_embeddings,
)
else:
self._softmax_loss = SoftmaxLoss(
num_words=vocab.get_vocab_size("transactions"),
embedding_dim=self._forward_dim,
)
# This buffer is now unused and exists only for backwards compatibility reasons.
self.register_buffer("_last_average_loss", torch.zeros(1))
self._perplexity = Perplexity()
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
if initializer is not None:
initializer(self)
def test_sampled_equals_unsampled_during_eval(self):
sampled_softmax = SampledSoftmaxLoss(num_words=10000, embedding_dim=12, num_samples=40)
unsampled_softmax = _SoftmaxLoss(num_words=10000, embedding_dim=12)
sampled_softmax.eval()
unsampled_softmax.eval()
# set weights equal, use transpose because opposite shapes
sampled_softmax.softmax_w.data = unsampled_softmax.softmax_w.t()
sampled_softmax.softmax_b.data = unsampled_softmax.softmax_b
# sequence_length, embedding_dim
embedding = torch.rand(100, 12)
targets = torch.randint(0, 1000, (100,)).long()
full_loss = unsampled_softmax(embedding, targets).item()
sampled_loss = sampled_softmax(embedding, targets).item()
# Should be really close
np.testing.assert_almost_equal(sampled_loss, full_loss)
def test_sampled_equals_unsampled_when_biased_against_non_sampled_positions(
self):
sampled_softmax = SampledSoftmaxLoss(num_words=10000,
embedding_dim=12,
num_samples=10)
unsampled_softmax = SoftmaxLoss(num_words=10000, embedding_dim=12)
# fake out choice function
FAKE_SAMPLES = [100, 200, 300, 400, 500, 600, 700, 800, 900, 9999]
def fake_choice(num_words: int,
num_samples: int) -> Tuple[np.ndarray, int]:
assert (num_words, num_samples) == (10000, 10)
return np.array(FAKE_SAMPLES), 12
sampled_softmax.choice_func = fake_choice
# bias out the unsampled terms:
for i in range(10000):
if i not in FAKE_SAMPLES:
unsampled_softmax.softmax_b[i] = -10000
# set weights equal, use transpose because opposite shapes
sampled_softmax.softmax_w.data = unsampled_softmax.softmax_w.t()
sampled_softmax.softmax_b.data = unsampled_softmax.softmax_b
sampled_softmax.train()
unsampled_softmax.train()
# sequence_length, embedding_dim
embedding = torch.rand(100, 12)
targets = torch.randint(0, 1000, (100, )).long()
full_loss = unsampled_softmax(embedding, targets).item()
sampled_loss = sampled_softmax(embedding, targets).item()
# Should be close
pct_error = (sampled_loss - full_loss) / full_loss
assert abs(pct_error) < 0.001
def __init__(self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
dropout: float = None,
loss_scale: Union[float, str] = 1.0,
num_samples: int = None,
sparse_embeddings: bool = False,
bidirectional: bool = False,
initializer: InitializerApplicator = None) -> None:
super().__init__(vocab)
self._text_field_embedder = text_field_embedder
if contextualizer.is_bidirectional() is not bidirectional:
raise ConfigurationError(
"Bidirectionality of contextualizer must match bidirectionality of "
"language model. "
f"Contextualizer bidirectional: {contextualizer.is_bidirectional()}, "
f"language model bidirectional: {bidirectional}")
self._contextualizer = contextualizer
self._bidirectional = bidirectional
# The dimension for making predictions just in the forward
# (or backward) direction.
if self._bidirectional:
self._forward_dim = contextualizer.get_output_dim() // 2
else:
self._forward_dim = contextualizer.get_output_dim()
# TODO(joelgrus): more sampled softmax configuration options, as needed.
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=sparse_embeddings)
else:
self._softmax_loss = _SoftmaxLoss(num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim)
# TODO(brendanr): Output perplexity here. e^loss
self.register_buffer('_last_average_loss', torch.zeros(1))
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
self._loss_scale = loss_scale
if initializer is not None:
initializer(self)
def test_sampled_almost_equals_unsampled_when_num_samples_is_almost_all(self):
sampled_softmax = SampledSoftmaxLoss(num_words=10000, embedding_dim=12, num_samples=9999)
unsampled_softmax = _SoftmaxLoss(num_words=10000, embedding_dim=12)
# sequence_length, embedding_dim
embedding = torch.rand(100, 12)
targets = torch.randint(0, 1000, (100,)).long()
full_loss = unsampled_softmax(embedding, targets).item()
sampled_loss = sampled_softmax(embedding, targets).item()
# Should be really close
pct_error = (sampled_loss - full_loss) / full_loss
assert abs(pct_error) < 0.02
def __init__(self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
forward_segmental_contextualizer: Seq2SeqEncoder,
backward_segmental_contextualizer: Seq2SeqEncoder,
label_feature_dim: int,
softmax_projection_dim: int,
label_namespace: str = "labels",
dropout: float = None,
num_samples: int = None,
sparse_embeddings: bool = False,
bidirectional: bool = True,
initializer: InitializerApplicator = None) -> None:
super().__init__(vocab=vocab,
text_field_embedder=text_field_embedder,
contextualizer=contextualizer,
dropout=dropout,
num_samples=num_samples,
sparse_embeddings=sparse_embeddings,
bidirectional=bidirectional,
initializer=initializer)
self._forward_segmental_contextualizer = forward_segmental_contextualizer
self._backward_segmental_contextualizer = backward_segmental_contextualizer
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=softmax_projection_dim,
num_samples=num_samples,
sparse=sparse_embeddings)
else:
self._softmax_loss = _SoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=softmax_projection_dim)
self.num_classes = self.vocab.get_vocab_size(label_namespace)
self.label_feature_embedding = Embedding(self.num_classes,
label_feature_dim)
base_dim = contextualizer.get_output_dim() // 2
seg_dim = base_dim + label_feature_dim
self._forward_dim = softmax_projection_dim
self.pre_segmental_layer = TimeDistributed(
Linear(seg_dim, softmax_projection_dim))
self.projection_layer = TimeDistributed(
Linear(base_dim * 2, softmax_projection_dim))
def __init__(
self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
hyperbolic_embedder: TextFieldEmbedder,
hyperbolic_encoder: Seq2VecEncoder,
hyperbolic_weight: float,
is_baseline: bool = False,
dropout: float = None,
num_samples: int = None,
sparse_embeddings: bool = False,
bidirectional: bool = False,
initializer: InitializerApplicator = None,
) -> None:
super().__init__(
vocab,
text_field_embedder,
contextualizer,
dropout,
num_samples,
sparse_embeddings,
bidirectional,
initializer
)
# reinitialize self._softmax_loss to change default namespace 'token'
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(namespace='euclidean'),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=sparse_embeddings,
)
else:
self._softmax_loss = SoftmaxLoss(
num_words=vocab.get_vocab_size(namespace='euclidean'),
embedding_dim=self._forward_dim
)
# initialize hyperbolic components
self._hyperbolic_embedder = hyperbolic_embedder
self._hyperbolic_encoder = hyperbolic_encoder
self._hyperbolic_encoding_loss = HyperbolicL1()
self._hyperbolic_weight = hyperbolic_weight
# vanila language mode
self.is_baseline = is_baseline
def test_sampled_softmax_has_greater_loss_in_train_mode(self):
sampled_softmax = SampledSoftmaxLoss(num_words=10000, embedding_dim=12, num_samples=10)
# sequence_length, embedding_dim
embedding = torch.rand(100, 12)
targets = torch.randint(0, 1000, (100,)).long()
sampled_softmax.train()
train_loss = sampled_softmax(embedding, targets).item()
sampled_softmax.eval()
eval_loss = sampled_softmax(embedding, targets).item()
assert eval_loss > train_loss
def __init__(self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
layer_norm: Optional[MaskedLayerNorm] = None,
dropout: float = None,
loss_scale: Union[float, str] = 1.0,
remove_bos_eos: bool = True,
num_samples: int = None,
sparse_embeddings: bool = False) -> None:
super().__init__(vocab)
self._text_field_embedder = text_field_embedder
self._layer_norm = layer_norm or (lambda x: x)
if not contextualizer.is_bidirectional():
raise ConfigurationError("contextualizer must be bidirectional")
self._contextualizer = contextualizer
# The dimension for making predictions just in the forward
# (or backward) direction.
self._forward_dim = contextualizer.get_output_dim() // 2
# TODO(joelgrus): more sampled softmax configuration options, as needed.
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=sparse_embeddings)
else:
self._softmax_loss = _SoftmaxLoss(num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim)
self.register_buffer('_last_average_loss', torch.zeros(1))
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
self._loss_scale = loss_scale
self._remove_bos_eos = remove_bos_eos
def __init__(self,
vocab: Vocabulary,
embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
dropout: float = None,
tie_embeddings: bool = True,
num_samples: int = None,
use_variational_dropout: bool = False):
super().__init__(vocab)
self._embedder = embedder
self._contextualizer = contextualizer
self._context_dim = contextualizer.get_output_dim()
if use_variational_dropout:
self._dropout = InputVariationalDropout(
dropout) if dropout else lambda x: x
else:
self._dropout = Dropout(dropout) if dropout else lambda x: x
vocab_size = self.vocab.get_vocab_size()
padding_index = self.vocab.get_token_index(DEFAULT_PADDING_TOKEN)
if num_samples:
self._softmax_loss = SampledSoftmaxLoss(vocab_size,
self._context_dim,
num_samples)
else:
self._softmax_loss = SoftmaxLoss(vocab_size, self._context_dim,
padding_index)
self._tie_embeddings = tie_embeddings
if self._tie_embeddings:
embedder_children = dict(self._embedder.named_children())
word_embedder = embedder_children["token_embedder_tokens"]
assert self._softmax_loss.softmax_w.size(
) == word_embedder.weight.size()
self._softmax_loss.softmax_w = word_embedder.weight
def __init__(
self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
aux_contextualizer: Seq2SeqEncoder,
dropout: float = None,
num_samples: int = None,
sparse_embeddings: bool = False,
bidirectional: bool = False,
initializer: InitializerApplicator = None,
regularizer: Optional[RegularizerApplicator] = None,
) -> None:
super().__init__(vocab, regularizer)
self._text_field_embedder = text_field_embedder
if contextualizer.is_bidirectional() is not bidirectional:
raise ConfigurationError(
"Bidirectionality of contextualizer must match bidirectionality of "
"language model. "
f"Contextualizer bidirectional: {contextualizer.is_bidirectional()}, "
f"language model bidirectional: {bidirectional}")
self._contextualizer_lang1 = aux_contextualizer
self._contextualizer_lang2 = copy.deepcopy(aux_contextualizer)
self._contextualizer = contextualizer
self._bidirectional = bidirectional
self._bidirectional_aux = aux_contextualizer.is_bidirectional()
# The dimension for making predictions just in the forward
# (or backward) direction.
# main contextualizer forward dim
if self._bidirectional:
self._forward_dim = contextualizer.get_output_dim() // 2
else:
self._forward_dim = contextualizer.get_output_dim()
# aux contextualizer forward dim
if self._bidirectional_aux:
self._forward_dim_aux = aux_contextualizer.get_output_dim() // 2
else:
self._forward_dim_aux = aux_contextualizer.get_output_dim()
# TODO(joelgrus): more sampled softmax configuration options, as needed.
if num_samples is not None:
self._lang1_softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim_aux,
num_samples=num_samples,
sparse=sparse_embeddings,
)
self._lang2_softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim_aux,
num_samples=num_samples,
sparse=sparse_embeddings,
)
self._cm_softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=sparse_embeddings,
)
else:
self._lang1_softmax_loss = _SoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim_aux)
self._lang2_softmax_loss = _SoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim_aux)
self._cm_loss = _SoftmaxLoss(num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim)
# This buffer is now unused and exists only for backwards compatibility reasons.
self.register_buffer("_last_average_loss", torch.zeros(1))
self._lang1_perplexity = Perplexity()
self._lang2_perplexity = Perplexity()
self._cm_perplexity = Perplexity()
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
if initializer is not None:
initializer(self)
def __init__(self,
vocab: Vocabulary,
text_field_embedder: TextFieldEmbedder,
encoder: Seq2SeqEncoder,
spellchecker_namespace: str = 'target_tokens',
punct_namespace: str = 'punct_labels',
feedforward: Optional[FeedForward] = None,
punct_hidden: int = 256,
embedding_dropout: Optional[float] = None,
encoded_dropout: Optional[float] = None,
punct_dropout: Optional[float] = None,
punct_weight: Optional[Dict[str, float]] = None,
num_samples: Optional[int] = None,
initializer: InitializerApplicator = InitializerApplicator(),
regularizer: Optional[RegularizerApplicator] = None) -> None:
super().__init__(vocab, regularizer)
self.label_namespace = punct_namespace
self.text_field_embedder = text_field_embedder
self.token_vocab_size = self.vocab.get_vocab_size(
spellchecker_namespace)
self.punct_vocab_size = self.vocab.get_vocab_size(punct_namespace)
self.encoder = encoder
self.embedding_dropout = Dropout(
embedding_dropout) if embedding_dropout is not None else None
self.encoded_dropout = Dropout(
encoded_dropout) if encoded_dropout is not None else None
self.feedforward = feedforward
if feedforward is not None:
self.output_dim = feedforward.get_output_dim()
else:
self.output_dim = self.encoder.get_output_dim()
if punct_dropout is not None:
self.punct_projection = Sequential(
Linear(self.output_dim, punct_hidden), Dropout(punct_dropout),
Linear(punct_hidden, self.punct_vocab_size))
else:
self.punct_projection = Sequential(
Linear(self.output_dim, punct_hidden),
Linear(punct_hidden, self.punct_vocab_size))
self.losses = {
'spellchecker':
SoftmaxLoss(num_words=self.token_vocab_size,
embedding_dim=self.output_dim +
1) if num_samples is None else SampledSoftmaxLoss(
num_words=self.token_vocab_size,
embedding_dim=self.output_dim + 1,
num_samples=num_samples),
'punct':
CrossEntropyLoss(weight=self.__get_weight_tensor(punct_weight),
reduction='sum',
ignore_index=-1)
}
self.add_module('spellchecker_loss', self.losses['spellchecker'])
self.add_module('punct_loss', self.losses['punct'])
self.metrics = {'punct_accuracy': CategoricalAccuracy()}
self.metrics.update({
f'f1_score_{name}': F1Measure(
self.vocab.get_token_index(name, namespace=punct_namespace))
for name in self.vocab.get_token_to_index_vocabulary(
namespace=punct_namespace)
})
initializer(self)
class AclSequenceModel(Model):
def __init__(self,
vocab: Vocabulary,
seq_embedder: TextFieldEmbedder,
abstract_text_field_embedder: TextFieldEmbedder,
contextualizer: Seq2SeqEncoder,
calculate_recall: bool = False,
use_abstracts: bool = True,
use_node_vectors: bool = True,
num_samples: int = None,
dropout: float = None) -> None:
super().__init__(vocab)
self._abstract_text_field_embedder = abstract_text_field_embedder
self._use_abstracts = use_abstracts
self._use_node_vectors = use_node_vectors
self._seq_embedder = seq_embedder
self._calculate_recall = calculate_recall
# lstm encoder uses PytorchSeq2SeqWrapper for pytorch lstm
self._contextualizer = contextualizer
self._forward_dim = contextualizer.get_output_dim()
if num_samples is not None:
self._softmax_loss = SampledSoftmaxLoss(
num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim,
num_samples=num_samples,
sparse=False)
else:
self._softmax_loss = _SoftmaxLoss(num_words=vocab.get_vocab_size(),
embedding_dim=self._forward_dim)
self._n_list = range(1, 50)
self._recall_at_n = {}
for n in self._n_list:
self._recall_at_n[n] = RecallAtN(n)
self._perplexity = Perplexity()
if dropout:
self._dropout = torch.nn.Dropout(dropout)
else:
self._dropout = lambda x: x
def _compute_loss(self, lm_embeddings: torch.Tensor,
targets: torch.Tensor) -> torch.Tensor:
# Because the targets are offset by 1, we re-mask to
# remove the final 0 in the targets
mask = targets > 0
non_masked_targets = targets.masked_select(mask) - 1
non_masked_embeddings = lm_embeddings.masked_select(
mask.unsqueeze(-1)).view(-1, self._forward_dim)
return self._softmax_loss(non_masked_embeddings, non_masked_targets)
def _compute_probs(self, lm_embeddings: torch.Tensor,
targets: torch.Tensor) -> torch.Tensor:
# Because the targets are offset by 1, we re-mask to
# remove the final 0 in the targets
mask = targets > 0
non_masked_targets = targets.masked_select(mask) - 1
non_masked_embeddings = lm_embeddings.masked_select(
mask.unsqueeze(-1)).view(-1, self._forward_dim)
return self._softmax_loss.probs(non_masked_embeddings)
def num_layers(self) -> int:
return self_contextualizer.num_layers + 1
def forward(
self, abstracts: Dict[str, torch.LongTensor],
paper_ids: Dict[str, torch.LongTensor]) -> Dict[str, torch.Tensor]:
"""
Computes the loss from the batch.
"""
if self._use_abstracts and self._use_node_vectors:
embeddings = torch.cat([
self._abstract_text_field_embedder(abstracts)[:, :, 0, :],
self._seq_embedder(paper_ids)
],
dim=-1)
mask = get_text_field_mask(abstracts, num_wrapping_dims=1)
mask = mask.sum(dim=-1) > 0
elif self._use_abstracts:
embeddings = self._abstract_text_field_embedder(abstracts)[:, :,
0, :]
mask = get_text_field_mask(abstracts, num_wrapping_dims=1)
mask = mask.sum(dim=-1) > 0
elif self._use_node_vectors:
embeddings = self._seq_embedder(paper_ids)
mask = get_text_field_mask(paper_ids)
else:
# When use_node_vectors is false, the embedder should be configured
# to initialize random embeddings. The redundant else condition
# makes this difference in behavior a little more explicit, even
# though the content of the block is identical.
embeddings = self._seq_embedder(paper_ids)
mask = get_text_field_mask(paper_ids)
contextual_embeddings: Union[
torch.Tensor,
List[torch.Tensor]] = self._contextualizer(embeddings, mask.long())
contextual_embeddings_with_dropout = self._dropout(
contextual_embeddings)
return_dict = {}
assert isinstance(contextual_embeddings_with_dropout, torch.Tensor)
# targets is like paper ids, but offset forward by 1 in the second
# dimension.
targets = torch.zeros_like(paper_ids['tokens'])
targets[:, 0:targets.size()[1] - 1] = paper_ids['tokens'][:, 1:]
loss = self._compute_loss(contextual_embeddings_with_dropout, targets)
num_targets = torch.sum((targets > 0).long())
if num_targets > 0:
average_loss = loss / num_targets.float()
else:
average_loss = torch.tensor(0.0).to(targets.device)
perplexity = self._perplexity(average_loss)
if self._calculate_recall:
top_k = self.get_recall_at_n(contextual_embeddings, targets)
return_dict.update({'top_k': top_k})
if num_targets > 0:
return_dict.update({
'loss': average_loss,
'batch_weight': num_targets.float()
})
else:
return_dict.update({'loss': average_loss})
return_dict.update({
'lm_embeddings': contextual_embeddings,
'lm_targets': targets,
'noncontextual_embeddings': embeddings,
})
return return_dict
def get_recall_at_n(self, embeddings, targets):
top_n = []
# iterate over batches:
for embeddings, targets in zip(embeddings.detach(), targets.detach()):
# (sequence_length, #targets)
probs = self._compute_probs(embeddings, targets)
top_probs, top_indices = probs.topk(k=max(self._n_list), dim=-1)
top_ids = [[
self.vocab.get_token_from_index(int(i)) for i in top_n
] for top_n in top_indices]
top_n.append(top_ids)
mask = targets > 0
non_masked_targets = targets.masked_select(mask) - 1
for n in self._n_list:
self._recall_at_n[n](non_masked_targets, top_indices)
return top_n
def get_metrics(self, reset: bool = False):
metrics = {"perplexity": self._perplexity.get_metric(reset=reset)}
if self._calculate_recall:
for n in self._n_list:
recall = self._recall_at_n[n].get_metric(reset=reset)
metrics.update({"recall_at_{}".format(n): recall})
return metrics
