modeling

modeling#

class ChineseBertModel(config: ChineseBertConfig)[source]#

Bases: ChineseBertPretrainedModel

The bare ChineseBert 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 (ChineseBertConfig) – An instance of ChineseBertConfig used to construct ChineseBertModel.

forward(input_ids, pinyin_ids=None, token_type_ids=None, position_ids=None, attention_mask=None, output_hidden_states=False)[source]#

The ChineseBert 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].

  • pinyin_ids (Tensor, optional) – Indices of input sequence tokens pinyin. We apply a CNN model with width 2 on the pinyin sequence, followed by max-pooling to derive the resulting pinyin embedding. This makes output dimensionality immune to the length of the input pinyin sequence. The length of the input pinyin sequence is fixed at 8. Its data type should be int64 and it has a shape of [batch_size, sequence_length, 8]. Defaults to None, which means we don’t add pinyin embeddings.

  • 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 on 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]. Defaults to None, which means nothing needed to be prevented attention to.

  • output_hidden_states (bool, optional) – Whether to return the output of each hidden layers. Defaults to False.

Returns:

Returns tuple (sequence_output, pooled_output) or (encoder_outputs, pooled_output).

With the fields:

  • sequence_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].

  • encoder_outputs (List(Tensor)):

    A list of Tensor containing hidden-states of the model at each hidden layer in the Transformer encoder. The length of the list is num_hidden_layers. Each Tensor has a data type of float32 and its shape is [batch_size, sequence_length, hidden_size].

Return type:

tuple

Example

import paddle
from paddlenlp.transformers import ChineseBertModel, ChineseBertTokenizer

tokenizer = ChineseBertTokenizer.from_pretrained('ChineseBERT-base')
model = ChineseBertModel.from_pretrained('ChineseBERT-base')

inputs = tokenizer("欢迎使用百度飞桨!")
inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()}
output = model(**inputs)
get_input_embeddings()[source]#

get input embedding of model

Returns:

embedding of model

Return type:

nn.Embedding

set_input_embeddings(value)[source]#

set new input embedding for model

Parameters:

value (Embedding) – the new embedding of model

Raises:

NotImplementedError – Model has not implement set_input_embeddings method

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

Bases: PretrainedModel

An abstract class for pretrained ChineseBert models. It provides ChineseBert related model_config_file, pretrained_init_configuration, resource_files_names, pretrained_resource_files_map, base_model_prefix for downloading and loading pretrained models. See PretrainedModel for more details.

config_class#

alias of ChineseBertConfig

base_model_class#

alias of ChineseBertModel

class ChineseBertForPretraining(config: ChineseBertConfig)[source]#

Bases: ChineseBertPretrainedModel

ChineseBert Model with pretraining tasks on top.

Parameters:

config (ChineseBertConfig) – An instance of ChineseBertConfig used to construct ChineseBertForPretraining.e.

forward(input_ids, pinyin_ids=None, token_type_ids=None, position_ids=None, attention_mask=None, masked_positions=None)[source]#
Parameters:
Returns:

Returns tuple (prediction_scores, seq_relationship_score).

With the fields:

  • prediction_scores (Tensor):

    The scores of masked token prediction. Its data type should be float32. If masked_positions is None, its shape is [batch_size, sequence_length, vocab_size]. Otherwise, its shape is [batch_size, mask_token_num, vocab_size].

  • seq_relationship_score (Tensor):

    The scores of next sentence prediction. Its data type should be float32 and its shape is [batch_size, 2].

Return type:

tuple

class ChineseBertPretrainingCriterion(vocab_size)[source]#

Bases: Layer

Parameters:

vocab_size (int) – Vocabulary size of inputs_ids in ChineseBertModel. Defines the number of different tokens that can be represented by the inputs_ids passed when calling ChineseBertBertModel.

forward(prediction_scores, seq_relationship_score, masked_lm_labels, next_sentence_labels, masked_lm_scale)[source]#
Parameters:

  • prediction_scores (Tensor) – The scores of masked token prediction. Its data type should be float32. If masked_positions is None, its shape is [batch_size, sequence_length, vocab_size]. Otherwise, its shape is [batch_size, mask_token_num, vocab_size]

  • seq_relationship_score (Tensor) – The scores of next sentence prediction. Its data type should be float32 and its shape is [batch_size, 2]

  • masked_lm_labels (Tensor) – The labels of the masked language modeling, its dimensionality is equal to prediction_scores. Its data type should be int64. If masked_positions is None, its shape is [batch_size, sequence_length, 1]. Otherwise, its shape is [batch_size, mask_token_num, 1]

  • next_sentence_labels (Tensor) – The labels of the next sentence prediction task, the dimensionality of next_sentence_labels is equal to seq_relation_labels. Its data type should be int64 and its shape is [batch_size, 1]

  • masked_lm_scale (Tensor or int) – The scale of masked tokens. Used for the normalization of masked language modeling loss. If it is a Tensor, its data type should be int64 and its shape is equal to prediction_scores.

Returns:

The pretraining loss, equals to the sum of masked_lm_loss plus the mean of next_sentence_loss. Its data type should be float32 and its shape is [1].

Return type:

Tensor

class ChineseBertForSequenceClassification(config: ChineseBertConfig)[source]#

Bases: ChineseBertPretrainedModel

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

Parameters:

config (ChineseBertConfig) – An instance of ChineseBertConfig used to construct ChineseBertForSequenceClassification.e.

forward(input_ids, pinyin_ids=None, token_type_ids=None, position_ids=None, attention_mask=None)[source]#

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

Parameters:
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.chinesebert.modeling import ChineseBertForSequenceClassification
from paddlenlp.transformers.chinesebert.tokenizer import ChineseBertTokenizer

tokenizer = ChineseBertTokenizer.from_pretrained('ChineseBERT-base')
model = ChineseBertForSequenceClassification.from_pretrained('ChineseBERT-base', num_classes=2)

inputs = tokenizer("欢迎使用百度飞桨!")
inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()}

logits = model(**inputs)
print(logits.shape)
# [1, 2]
class ChineseBertForTokenClassification(config: ChineseBertConfig)[source]#

Bases: ChineseBertPretrainedModel

ChineseBert Model with a linear layer on top of the hidden-states output layer, designed for token classification tasks like NER tasks.

Parameters:

config (ChineseBertConfig) – An instance of ChineseBertConfig used to construct ChineseBertForTokenClassification.e.

forward(input_ids, pinyin_ids=None, token_type_ids=None, position_ids=None, attention_mask=None)[source]#

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

Parameters:
Returns:

Returns tensor logits, a tensor of the input token classification logits. Shape as [batch_size, sequence_length, num_classes] and dtype as float32.

Return type:

Tensor

Example

import paddle
from paddlenlp.transformers.chinesebert.modeling import ChineseBertForSequenceClassification
from paddlenlp.transformers.chinesebert.tokenizer import ChineseBertTokenizer

tokenizer = ChineseBertTokenizer.from_pretrained('ChineseBERT-base')
model = ChineseBertForSequenceClassification.from_pretrained('ChineseBERT-base', num_classes=2)

inputs = tokenizer("欢迎使用百度飞桨!")
inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()}

logits = model(**inputs)
print(logits.shape)
# [1, 13, 2]
class ChineseBertForQuestionAnswering(config: ChineseBertConfig)[source]#

Bases: ChineseBertPretrainedModel

ChineseBert 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.

Parameters:

config (ChineseBertConfig) – An instance of ChineseBertConfig used to construct ChineseBertForQuestionAnswering.

forward(input_ids, pinyin_ids=None, token_type_ids=None, attention_mask=None)[source]#

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

Parameters:
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.chinesebert.modeling import ChineseBertForQuestionAnswering
from paddlenlp.transformers.chinesebert.tokenizer import ChineseBertTokenizer

tokenizer = ChineseBertTokenizer.from_pretrained('ChineseBERT-base')
model = ChineseBertForQuestionAnswering.from_pretrained('ChineseBERT-base')

inputs = tokenizer("欢迎使用百度飞桨!")
inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()}
outputs = model(**inputs)

start_logits = outputs[0]
end_logits = outputs[1]