modeling¶
-
class
TinyBertModel
(vocab_size, hidden_size=768, num_hidden_layers=12, num_attention_heads=12, intermediate_size=3072, hidden_act='gelu', hidden_dropout_prob=0.1, attention_probs_dropout_prob=0.1, max_position_embeddings=512, type_vocab_size=16, initializer_range=0.02, pad_token_id=0, fit_size=768)[source]¶ Bases:
paddlenlp.transformers.tinybert.modeling.TinyBertPretrainedModel
The bare TinyBERT Model transformer outputting raw hidden-states.
This model inherits from
PretrainedModel
. Refer to the superclass documentation for the generic methods.This model is also a Paddle paddle.nn.Layer subclass. Use it as a regular Paddle Layer and refer to the Paddle documentation for all matter related to general usage and behavior.
- Parameters
vocab_size (int) – Vocabulary size of
inputs_ids
inTinyBertModel
. Defines the number of different tokens that can be represented by theinputs_ids
passed when callingTinyBertModel
.hidden_size (int, optional) – Dimensionality of the embedding layer, encoder layers and pooler layer. Defaults to
768
.num_hidden_layers (int, optional) – Number of hidden layers in the Transformer encoder. Defaults to
12
.num_attention_heads (int, optional) – Number of attention heads for each attention layer in the Transformer encoder. Defaults to
12
.intermediate_size (int, optional) – Dimensionality of the feed-forward (ff) layer in the encoder. Input tensors to ff layers are firstly projected from
hidden_size
tointermediate_size
, and then projected back tohidden_size
. Typicallyintermediate_size
is larger thanhidden_size
. Defaults to3072
.hidden_act (str, optional) – The non-linear activation function in the feed-forward layer.
"gelu"
,"relu"
and any other paddle supported activation functions are supported. Defaults to"gelu"
.hidden_dropout_prob (float, optional) – The dropout probability for all fully connected layers in the embeddings and encoder. Defaults to
0.1
.attention_probs_dropout_prob (float, optional) – The dropout probability used in MultiHeadAttention in all encoder layers to drop some attention target. Defaults to
0.1
.max_position_embeddings (int, optional) – The maximum value of the dimensionality of position encoding. The dimensionality of position encoding is the dimensionality of the sequence in
TinyBertModel
. Defaults to512
.type_vocab_size (int, optional) – The vocabulary size of
token_type_ids
passed when callingTinyBertModel
. Defaults to16
.initializer_range (float, optional) –
The standard deviation of the normal initializer. Defaults to
0.02
.Note
A normal_initializer initializes weight matrices as normal distributions. See
TinyBertPretrainedModel.init_weights()
for how weights are initialized inTinyBertModel
.pad_token_id (int, optional) – The index of padding token in the token vocabulary. Defaults to
0
.fit_size (int, optional) – Dimensionality of the output layer of
fit_dense(s)
, which is the hidden size of the teacher model.fit_dense(s)
means a hidden states’ transformation from student to teacher.fit_dense(s)
will be generated when bert model is distilled during the training, and will not be generated during the prediction process.fit_denses
is used in v2 models and it hasnum_hidden_layers+1
layers.fit_dense
is used in other pretraining models and it has one linear layer. Defaults to768
.
-
forward
(input_ids, token_type_ids=None, attention_mask=None)[source]¶ The TinyBertModel forward method, overrides the
__call__()
special method.- Parameters
input_ids (Tensor) – Indices of input sequence tokens in the vocabulary. They are numerical representations of tokens that build the input sequence. Its data type should be
int64
and it has a shape of [batch_size, sequence_length].token_type_ids (Tensor, optional) –
Segment token indices to indicate different portions of the inputs. Selected in the range
[0, type_vocab_size - 1]
. Iftype_vocab_size
is 2, which means the inputs have two portions. Indices can either be 0 or 1:0 corresponds to a sentence A token,
1 corresponds to a sentence B token.
Its data type should be
int64
and it has a shape of [batch_size, sequence_length]. Defaults toNone
, which means we don’t add segment embeddings.attention_mask (Tensor, optional) – Mask used in multi-head attention to avoid performing attention to some unwanted positions, usually the paddings or the subsequent positions. Its data type can be int, float and bool. When the data type is bool, the
masked
tokens haveFalse
values and the others haveTrue
values. When the data type is int, themasked
tokens have0
values and the others have1
values. When the data type is float, themasked
tokens have-INF
values and the others have0
values. It is a tensor with shape broadcasted to[batch_size, num_attention_heads, sequence_length, sequence_length]
. For example, its shape can be [batch_size, sequence_length], [batch_size, sequence_length, sequence_length], [batch_size, num_attention_heads, sequence_length, sequence_length]. Defaults toNone
, which means nothing needed to be prevented attention to.
- Returns
Returns tuple (
encoder_output
,pooled_output
).With the fields:
encoder_output
(Tensor):Sequence of hidden-states at the last layer of the model. It’s data type should be float32 and its shape is [batch_size, sequence_length, hidden_size].
pooled_output
(Tensor):The output of first token (
[CLS]
) in sequence. We “pool” the model by simply taking the hidden state corresponding to the first token. Its data type should be float32 and its shape is [batch_size, hidden_size].
- Return type
tuple
Example
import paddle from paddlenlp.transformers import TinyBertModel, TinyBertTokenizer tokenizer = TinyBertTokenizer.from_pretrained('tinybert-4l-312d') model = TinyBertModel.from_pretrained('tinybert-4l-312d') inputs = tokenizer("Welcome to use PaddlePaddle and PaddleNLP! ") inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()} output = model(**inputs)
-
class
TinyBertPretrainedModel
(name_scope=None, dtype='float32')[source]¶ Bases:
paddlenlp.transformers.model_utils.PretrainedModel
An abstract class for pretrained TinyBERT models. It provides TinyBERT related
model_config_file
,resource_files_names
,pretrained_resource_files_map
,pretrained_init_configuration
,base_model_prefix
for downloading and loading pretrained models. SeePretrainedModel
for more details.-
base_model_class
¶ alias of
paddlenlp.transformers.tinybert.modeling.TinyBertModel
-
-
class
TinyBertForPretraining
(tinybert)[source]¶ Bases:
paddlenlp.transformers.tinybert.modeling.TinyBertPretrainedModel
TinyBert Model with pretraining tasks on top.
- Parameters
tinybert (
TinyBertModel
) – An instance ofTinyBertModel
.
-
forward
(input_ids, token_type_ids=None, attention_mask=None)[source]¶ The TinyBertForPretraining forward method, overrides the __call__() special method.
- Parameters
input_ids (Tensor) – See
TinyBertModel
.token_tycpe_ids (Tensor, optional) – See
TinyBertModel
.attention_mask (Tensor, optional) – See
TinyBertModel
.
- Returns
Returns tensor
sequence_output
, sequence of hidden-states at the last layer of the model. It’s data type should be float32 and its shape is [batch_size, sequence_length, hidden_size].- Return type
Tensor
Example
import paddle from paddlenlp.transformers.tinybert.modeling import TinyBertForPretraining from paddlenlp.transformers.tinybert.tokenizer import TinyBertTokenizer tokenizer = TinyBertTokenizer.from_pretrained('tinybert-4l-312d') model = TinyBertForPretraining.from_pretrained('tinybert-4l-312d') inputs = tokenizer("Welcome to use PaddlePaddle and PaddleNLP! ") inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()} outputs = model(**inputs) logits = outputs[0]
-
class
TinyBertForSequenceClassification
(tinybert, num_classes=2, dropout=None)[source]¶ Bases:
paddlenlp.transformers.tinybert.modeling.TinyBertPretrainedModel
TinyBert Model with a linear layer on top of the output layer, designed for sequence classification/regression tasks like GLUE tasks.
- Parameters
tinybert (
TinyBertModel
) – An instance of TinyBertModel.num_classes (int, optional) – The number of classes. Defaults to
2
.dropout (float, optional) – The dropout probability for output of TinyBert. If None, use the same value as
hidden_dropout_prob
ofTinyBertModel
instancetinybert
. Defaults toNone
.
-
forward
(input_ids, token_type_ids=None, attention_mask=None)[source]¶ The TinyBertForSequenceClassification forward method, overrides the __call__() special method.
- Parameters
input_ids (Tensor) – See
TinyBertModel
.token_type_ids (Tensor, optional) – See
TinyBertModel
.attention_mask_list (list, optional) – See
TinyBertModel
.
- Returns
Returns tensor
logits
, a tensor of the input text classification logits. Shape as[batch_size, num_classes]
and dtype as float32.- Return type
Tensor
Example
import paddle from paddlenlp.transformers.tinybert.modeling import TinyBertForSequenceClassification from paddlenlp.transformers.tinybert.tokenizer import TinyBertTokenizer tokenizer = TinyBertTokenizer.from_pretrained('tinybert-4l-312d') model = TinyBertForSequenceClassification.from_pretrained('tinybert-4l-312d') inputs = tokenizer("Welcome to use PaddlePaddle and PaddleNLP! ") inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()} outputs = model(**inputs) logits = outputs[0]
-
class
TinyBertForQuestionAnswering
(tinybert)[source]¶ Bases:
paddlenlp.transformers.tinybert.modeling.TinyBertPretrainedModel
TinyBert Model with a linear layer on top of the hidden-states output to compute
span_start_logits
andspan_end_logits
, designed for question-answering tasks like SQuAD.- Parameters
tinybert (
TinyBertModel
) – An instance ofTinyBertModel
.
-
forward
(input_ids, token_type_ids=None, attention_mask=None)[source]¶ - Parameters
input_ids (Tensor) – See
TinyBertModel
.token_type_ids (Tensor, optional) – See
TinyBertModel
.attention_mask (Tensor, optional) – See
TinyBertModel
.
- Returns
Returns tuple (
start_logits
,end_logits
).With the fields:
start_logits
(Tensor):A tensor of the input token classification logits, indicates the start position of the labelled span. Its data type should be float32 and its shape is [batch_size, sequence_length].
end_logits
(Tensor):A tensor of the input token classification logits, indicates the end position of the labelled span. Its data type should be float32 and its shape is [batch_size, sequence_length].
- Return type
tuple
Example
import paddle from paddlenlp.transformers import TinyBertForQuestionAnswering, TinyBertTokenizer tokenizer = TinyBertTokenizer.from_pretrained('tinybert-6l-768d-zh') model = TinyBertForQuestionAnswering.from_pretrained('tinybert-6l-768d-zh') inputs = tokenizer("Welcome to use PaddlePaddle and PaddleNLP!") inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()} logits = model(**inputs)
-
class
TinyBertForMultipleChoice
(tinybert, num_choices=2, dropout=None)[source]¶ Bases:
paddlenlp.transformers.tinybert.modeling.TinyBertPretrainedModel
TinyBERT Model with a linear layer on top of the hidden-states output layer, designed for multiple choice tasks like RocStories/SWAG tasks.
- Parameters
tinybert (
TinyBertModel
) – An instance of TinyBertModel.num_choices (int, optional) – The number of choices. Defaults to
2
.dropout (float, optional) – The dropout probability for output of Tinybert. If None, use the same value as
hidden_dropout_prob
ofTinyBertModel
instancetinybert
. Defaults to None.
-
forward
(input_ids, token_type_ids=None, attention_mask=None)[source]¶ The TinyBertForMultipleChoice forward method, overrides the __call__() special method.
- Parameters
input_ids (Tensor) – See
TinyBertModel
and shape as [batch_size, num_choice, sequence_length].token_type_ids (Tensor, optional) – See
TinyBertModel
and shape as [batch_size, num_choice, sequence_length].attention_mask (list, optional) – See
TinyBertModel
and shape as [batch_size, num_choice, sequence_length].
- Returns
Returns tensor
reshaped_logits
, a tensor of the multiple choice classification logits. Shape as[batch_size, num_choice]
and dtype asfloat32
.- Return type
Tensor