modeling#

class TinyBertModel(config: TinyBertConfig)[source]#

Bases: 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:: config (TinyBertConfig) – An instance of TinyBertConfig used to construct TinyBertModel.

get_input_embeddings() → Embedding[source]#

get input embedding of TinyBert Pretrained Model

Returns:: the input embedding of tiny bert
Return type:: nn.Embedding

set_input_embeddings(embedding: Embedding) → None[source]#

set the input embedding with the new embedding value

Parameters:: embedding (nn.Embedding) – the new embedding value

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]. If type_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 to None, which means we don’t add segment embeddings.
position_ids (Tensor, optional) – Indices of positions of each input sequence tokens in the position embeddings. Selected in the range [0, max_position_embeddings - 1]. Shape as (batch_size, num_tokens) and dtype as int64. Defaults to None.
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 have False values and the others have True values. When the data type is int, the masked tokens have 0 values and the others have 1 values. When the data type is float, the masked tokens have -INF values and the others have 0 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 to None, which means nothing needed to be prevented attention to.
inputs_embeds (Tensor, optional) – If you want to control how to convert inputs_ids indices into associated vectors, you can pass an embedded representation directly instead of passing inputs_ids.
past_key_values (tuple(tuple(Tensor)), optional) – The length of tuple equals to the number of layers, and each inner tuple haves 4 tensors of shape (batch_size, num_heads, sequence_length - 1, embed_size_per_head)) which contains precomputed key and value hidden states of the attention blocks. If past_key_values are used, the user can optionally input only the last input_ids (those that don’t have their past key value states given to this model) of shape (batch_size, 1) instead of all input_ids of shape (batch_size, sequence_length).
use_cache (bool, optional) – If set to True, past_key_values key value states are returned. Defaults to None.
output_hidden_states (bool, optional) – Whether to return the hidden states of all layers. Defaults to False.
output_attentions (bool, optional) – Whether to return the attentions tensors of all attention layers. Defaults to False.
return_dict (bool, optional) – Whether to return a ModelOutput object. If False, the output will be a tuple of tensors. Defaults to False.

Returns:

An instance of BaseModelOutputWithPoolingAndCrossAttentions if return_dict=True. Otherwise it returns a tuple of tensors corresponding to ordered and not None (depending on the input arguments) fields of BaseModelOutputWithPoolingAndCrossAttentions.

tuple: 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].

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(*args, **kwargs)[source]#

Bases: 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. See PretrainedModel for more details.

config_class#: alias of TinyBertConfig

base_model_class#: alias of TinyBertModel

class TinyBertForPretraining(config: TinyBertConfig)[source]#

Bases: TinyBertPretrainedModel

TinyBert Model with pretraining tasks on top.

Parameters:: config (TinyBertConfig) – An instance of TinyBertConfig used to construct TinyBertForPretraining.

The TinyBertForPretraining forward method, overrides the __call__() special method.

Parameters:

input_ids (Tensor) – See TinyBertModel.
token_type_ids (Tensor, optional) – See TinyBertModel.
position_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(config: TinyBertConfig)[source]#

Bases: TinyBertPretrainedModel

TinyBert Model with a linear layer on top of the output layer, designed for sequence classification/regression tasks like GLUE tasks.

Parameters:: config (TinyBertConfig) – An instance of TinyBertConfig used to construct TinyBertForSequenceClassification.

The TinyBertForSequenceClassification forward method, overrides the __call__() special method.

Parameters:

input_ids (Tensor) – See TinyBertModel.
token_type_ids (Tensor, optional) – See TinyBertModel.
position_ids (Tensor, optional) – See TinyBertModel.
attention_mask_list (list, optional) – See TinyBertModel.
labels (Tensor of shape (batch_size,), optional) – Labels for computing the sequence classification/regression loss. Indices should be in [0, ..., num_labels - 1]. If num_labels == 1 a regression loss is computed (Mean-Square loss), If num_labels > 1 a classification loss is computed (Cross-Entropy).
output_hidden_states (bool, optional) – Whether to return the hidden states of all layers. Defaults to False.
output_attentions (bool, optional) – Whether to return the attentions tensors of all attention layers. Defaults to False.
return_dict (bool, optional) – Whether to return a SequenceClassifierOutput object. If False, the output will be a tuple of tensors. Defaults to False.

Returns:

An instance of SequenceClassifierOutput if return_dict=True. Otherwise it returns a tuple of tensors corresponding to ordered and not None (depending on the input arguments) fields of SequenceClassifierOutput.

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(config: TinyBertConfig)[source]#

Bases: TinyBertPretrainedModel

TinyBert Model with a linear layer on top of the hidden-states output to compute span_start_logits and span_end_logits, designed for question-answering tasks like SQuAD.

Args: :param config: An instance of TinyBertConfig used to construct TinyBertForQuestionAnswering. :type config: TinyBertConfig

Parameters:

input_ids (Tensor) – See TinyBertModel.
token_type_ids (Tensor, optional) – See TinyBertModel.
position_ids (Tensor, optional) – See TinyBertModel.
attention_mask (Tensor, optional) – See TinyBertModel.
start_positions (Tensor of shape (batch_size,), optional) – Labels for position (index) of the start of the labelled span for computing the token classification loss. Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence are not taken into account for computing the loss.
end_positions (Tensor of shape (batch_size,), optional) – Labels for position (index) of the end of the labelled span for computing the token classification loss. Positions are clamped to the length of the sequence (sequence_length). Position outside of the sequence are not taken into account for computing the loss.
output_hidden_states (bool, optional) – Whether to return the hidden states of all layers. Defaults to False.
output_attentions (bool, optional) – Whether to return the attentions tensors of all attention layers. Defaults to False.
return_dict (bool, optional) – Whether to return a QuestionAnsweringModelOutput object. If False, the output will be a tuple of tensors. Defaults to False.

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(config: TinyBertConfig)[source]#

Bases: TinyBertPretrainedModel

TinyBERT Model with a linear layer on top of the hidden-states output layer, designed for multiple choice tasks like RocStories/SWAG tasks.

Args: :param config: An instance of TinyBertConfig used to construct TinyBertForMultipleChoice. :type config: TinyBertConfig

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].
position_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].
labels (Tensor of shape (batch_size, ), optional) – Labels for computing the multiple choice classification loss. Indices should be in [0, ..., num_choices-1] where num_choices is the size of the second dimension of the input tensors. (See input_ids above)
output_hidden_states (bool, optional) – Whether to return the hidden states of all layers. Defaults to False.
output_attentions (bool, optional) – Whether to return the attentions tensors of all attention layers. Defaults to False.
return_dict (bool, optional) – Whether to return a MultipleChoiceModelOutput object. If False, the output will be a tuple of tensors. Defaults to False.

Returns:

Returns tensor reshaped_logits, a tensor of the multiple choice classification logits. Shape as [batch_size, num_choice] and dtype as float32.

Return type:

Tensor

modeling

Contents

modeling#