def __init__(self):
super().__init__()
self.embeddings = TransformerEmbeddings.from_pretrained_module(
pretrained)
self.transformer = TransformerStack.from_pretrained_module(
pretrained, num_hidden_layers=4)
def __init__(
self,
vocab: Vocabulary,
transformer_model: str = "roberta-large",
override_weights_file: Optional[str] = None,
**kwargs
) -> None:
super().__init__(vocab, **kwargs)
transformer_kwargs = {
"model_name": transformer_model,
"weights_path": override_weights_file,
}
self.embeddings = TransformerEmbeddings.from_pretrained_module(**transformer_kwargs)
self.transformer_stack = TransformerStack.from_pretrained_module(**transformer_kwargs)
self.pooler = TransformerPooler.from_pretrained_module(**transformer_kwargs)
self.pooler_dropout = Dropout(p=0.1)
self.linear_layer = torch.nn.Linear(self.pooler.get_output_dim(), 1)
self.linear_layer.weight.data.normal_(mean=0.0, std=0.02)
self.linear_layer.bias.data.zero_()
self.loss = torch.nn.CrossEntropyLoss()
from allennlp.training.metrics import CategoricalAccuracy
self.accuracy = CategoricalAccuracy()
def from_huggingface_model_name(
cls,
vocab: Vocabulary,
model_name: str,
image_feature_dim: int,
image_num_hidden_layers: int,
image_hidden_size: int,
image_num_attention_heads: int,
combined_hidden_size: int,
combined_num_attention_heads: int,
pooled_output_dim: int,
image_intermediate_size: int,
image_attention_dropout: float,
image_hidden_dropout: float,
image_biattention_id: List[int],
text_biattention_id: List[int],
text_fixed_layer: int,
image_fixed_layer: int,
pooled_dropout: float = 0.1,
fusion_method: str = "sum",
*,
ignore_text: bool = False,
ignore_image: bool = False,
):
text_embeddings = TransformerEmbeddings.from_pretrained_module(
model_name)
image_embeddings = ImageFeatureEmbeddings(
feature_size=image_feature_dim,
embedding_size=image_hidden_size,
dropout=image_hidden_dropout,
)
encoder = BiModalEncoder.from_pretrained_module(
model_name,
num_hidden_layers2=image_num_hidden_layers,
hidden_size2=image_hidden_size,
num_attention_heads2=image_num_attention_heads,
combined_hidden_size=combined_hidden_size,
combined_num_attention_heads=combined_num_attention_heads,
intermediate_size2=image_intermediate_size,
attention_dropout2=image_attention_dropout,
hidden_dropout2=image_hidden_dropout,
biattention_id1=text_biattention_id,
biattention_id2=image_biattention_id,
fixed_layer1=text_fixed_layer,
fixed_layer2=image_fixed_layer,
)
return cls(
vocab=vocab,
text_embeddings=text_embeddings,
image_embeddings=image_embeddings,
encoder=encoder,
pooled_output_dim=pooled_output_dim,
fusion_method=fusion_method,
dropout=pooled_dropout,
ignore_text=ignore_text,
ignore_image=ignore_image,
)
def __init__(self):
super().__init__()
self.embeddings = TransformerEmbeddings.from_pretrained_module(
pretrained, relevant_module="bert.embeddings")
self.transformer = TransformerStack.from_pretrained_module(
pretrained,
num_hidden_layers=4,
relevant_module="bert.encoder",
strict=False,
)
def __init__(self):
super().__init__()
self.embeddings = TransformerEmbeddings.from_pretrained_module(
"bert-base-uncased")
self.separate_transformer = TransformerStack.from_pretrained_module(
"bert-base-uncased", num_hidden_layers=range(0, 8))
self.combined_transformer = TransformerStack.from_pretrained_module(
"bert-base-uncased",
num_hidden_layers=range(8, 12),
)
def test_loading_from_pretrained_weights_using_model_name(self, pretrained_name):
pretrained_module = cached_transformers.get(pretrained_name, False).embeddings
module = TransformerEmbeddings.from_pretrained_module(pretrained_name)
mapping = {
val: key
for key, val in module._construct_default_mapping(
pretrained_module, "huggingface", {}
).items()
}
missing = assert_equal_parameters(pretrained_module, module, mapping=mapping)
assert len(missing) == 0
def test_loading_albert():
"""
Albert is a special case because it includes a Linear layer in the encoder
that maps the embeddings to the encoder hidden size, but we include this linear
layer within our embedding layer.
"""
transformer_embedding = TransformerEmbeddings.from_pretrained_module(
"albert-base-v2", )
albert = AutoModel.from_pretrained("albert-base-v2")
assert_allclose(
transformer_embedding.embeddings.word_embeddings.weight.data,
albert.embeddings.word_embeddings.weight.data,
)
assert_allclose(
transformer_embedding.linear_transform.weight.data,
albert.encoder.embedding_hidden_mapping_in.weight.data,
)
def __init__(self):
super().__init__()
self.embeddings = TransformerEmbeddings.from_pretrained_module(
"bert-base-cased", relevant_module="bert.embeddings")
self.separate_transformer = TransformerStack.from_pretrained_module(
"bert-base-cased",
relevant_module="bert.encoder",
num_hidden_layers=8,
strict=False,
)
self.combined_transformer = TransformerStack.from_pretrained_module(
"bert-base-cased",
relevant_module="bert.encoder",
num_hidden_layers=4,
mapping={
f"layer.{l}": f"layers.{i}"
for (i, l) in enumerate(range(8, 12))
},
strict=False,
)
def test_forward_against_huggingface_output(self, module_name, hf_module):
input_ids = torch.tensor([[1, 2]])
token_type_ids = torch.tensor([[1, 0]], dtype=torch.long)
position_ids = torch.tensor([[0, 1]])
torch.manual_seed(1234)
embeddings = TransformerEmbeddings.from_pretrained_module(hf_module)
torch.manual_seed(1234)
embeddings = embeddings.eval() # setting to eval mode to avoid non-deterministic dropout.
output = embeddings.forward(
input_ids=input_ids, token_type_ids=token_type_ids, position_ids=position_ids
)
torch.manual_seed(1234)
hf_module = hf_module.eval() # setting to eval mode to avoid non-deterministic dropout.
hf_output = hf_module.forward(
input_ids=input_ids, token_type_ids=token_type_ids, position_ids=position_ids
)
assert torch.allclose(output, hf_output)
def test_end_to_end(self, model_name: str):
data = [
("I'm against picketing", "but I don't know how to show it."),
("I saw a human pyramid once.", "It was very unnecessary."),
]
tokenizer = cached_transformers.get_tokenizer(model_name)
batch = tokenizer.batch_encode_plus(data,
padding=True,
return_tensors="pt")
with torch.no_grad():
huggingface_model = cached_transformers.get(
model_name, make_copy=False).eval()
huggingface_output = huggingface_model(**batch)
embeddings = TransformerEmbeddings.from_pretrained_module(
model_name).eval()
transformer_stack = TransformerStack.from_pretrained_module(
model_name).eval()
pooler = TransformerPooler.from_pretrained_module(
model_name).eval()
batch["attention_mask"] = batch["attention_mask"].to(torch.bool)
output = embeddings(**batch)
output = transformer_stack(output, batch["attention_mask"])
assert_allclose(
output.final_hidden_states,
huggingface_output.last_hidden_state,
rtol=0.0001,
atol=1e-4,
)
output = pooler(output.final_hidden_states)
assert_allclose(output,
huggingface_output.pooler_output,
rtol=0.0001,
atol=1e-4)
def __init__(
self,
vocab: Vocabulary,
transformer_model: str = "roberta-large",
num_labels: Optional[int] = None,
label_namespace: str = "labels",
override_weights_file: Optional[str] = None,
**kwargs,
) -> None:
super().__init__(vocab, **kwargs)
transformer_kwargs = {
"model_name": transformer_model,
"weights_path": override_weights_file,
}
self.embeddings = TransformerEmbeddings.from_pretrained_module(
**transformer_kwargs)
self.transformer_stack = TransformerStack.from_pretrained_module(
**transformer_kwargs)
self.pooler = TransformerPooler.from_pretrained_module(
**transformer_kwargs)
self.pooler_dropout = Dropout(p=0.1)
self.label_tokens = vocab.get_index_to_token_vocabulary(
label_namespace)
if num_labels is None:
num_labels = len(self.label_tokens)
self.linear_layer = torch.nn.Linear(self.pooler.get_output_dim(),
num_labels)
self.linear_layer.weight.data.normal_(mean=0.0, std=0.02)
self.linear_layer.bias.data.zero_()
from allennlp.training.metrics import CategoricalAccuracy, FBetaMeasure
self.loss = torch.nn.CrossEntropyLoss()
self.acc = CategoricalAccuracy()
self.f1 = FBetaMeasure()
def test_loading_from_pretrained_module(pretrained_name):
TransformerEmbeddings.from_pretrained_module(pretrained_name)
def from_huggingface_model_name(
cls,
vocab: Vocabulary,
model_name: str,
image_feature_dim: int,
image_num_hidden_layers: int,
image_hidden_size: int,
image_num_attention_heads: int,
combined_hidden_size: int,
combined_num_attention_heads: int,
pooled_output_dim: int,
image_intermediate_size: int,
image_attention_dropout: float,
image_hidden_dropout: float,
image_biattention_id: List[int],
text_biattention_id: List[int],
text_fixed_layer: int,
image_fixed_layer: int,
pooled_dropout: float = 0.1,
fusion_method: str = "sum",
*,
ignore_text: bool = False,
ignore_image: bool = False,
):
transformer = AutoModel.from_pretrained(model_name)
# Albert (and maybe others?) has this "embedding_size", that's different from "hidden_size".
# To get them to the same dimensionality, it uses a linear transform after the embedding
# layer, which we need to pull out and copy here.
if hasattr(transformer.config, "embedding_size"):
config = transformer.config
text_embeddings = TransformerEmbeddings.from_pretrained_module(
transformer.embeddings, output_size=config.hidden_dim
)
from transformers.models.albert.modeling_albert import AlbertModel
if isinstance(transformer, AlbertModel):
text_embeddings.linear_transform = deepcopy(
transformer.encoder.embedding_hidden_mapping_in
)
else:
logger.warning(
"Unknown model that uses separate embedding size; weights of the linear "
f"transform will not be initialized. Model type is: {transformer.__class__}"
)
else:
text_embeddings = TransformerEmbeddings.from_pretrained_module(transformer.embeddings)
image_embeddings = ImageFeatureEmbeddings(
feature_size=image_feature_dim,
embedding_size=image_hidden_size,
dropout=image_hidden_dropout,
)
encoder = BiModalEncoder.from_pretrained_module(
pretrained_module=transformer,
num_hidden_layers2=image_num_hidden_layers,
hidden_size2=image_hidden_size,
num_attention_heads2=image_num_attention_heads,
combined_hidden_size=combined_hidden_size,
combined_num_attention_heads=combined_num_attention_heads,
intermediate_size2=image_intermediate_size,
attention_dropout2=image_attention_dropout,
hidden_dropout2=image_hidden_dropout,
biattention_id1=text_biattention_id,
biattention_id2=image_biattention_id,
fixed_layer1=text_fixed_layer,
fixed_layer2=image_fixed_layer,
)
return cls(
vocab=vocab,
text_embeddings=text_embeddings,
image_embeddings=image_embeddings,
encoder=encoder,
pooled_output_dim=pooled_output_dim,
fusion_method=fusion_method,
dropout=pooled_dropout,
ignore_text=ignore_text,
ignore_image=ignore_image,
)
