Source code for transformers.models.rag.modeling_rag

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# Copyright 2020, The RAG Authors and The HuggingFace Inc. team.
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"""RAG model implementation."""

from dataclasses import dataclass
from typing import Callable, List, Optional, Tuple

import torch
from torch import nn

from ...configuration_utils import PretrainedConfig
from ...file_utils import add_start_docstrings_to_model_forward, replace_return_docstrings
from ...generation_beam_search import BeamSearchScorer
from ...modeling_outputs import ModelOutput
from ...modeling_utils import PreTrainedModel
from ...utils import logging
from .configuration_rag import RagConfig
from .retrieval_rag import RagRetriever


logger = logging.get_logger(__name__)

_CONFIG_FOR_DOC = "RagConfig"


[docs]@dataclass class RetrievAugLMMarginOutput(ModelOutput): """ Base class for retriever augmented marginalized models outputs. Args: loss (:obj:`torch.FloatTensor` of shape :obj:`(1,)`, `optional`, returned when :obj:`labels` is provided): Language modeling loss. logits (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, config.vocab_size)`): Prediction scores of the language modeling head. The score is possibly marginalized over all documents for each vocabulary token. doc_scores (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs)`): Score between each retrieved document embeddings (see :obj:`retrieved_doc_embeds`) and :obj:`question_encoder_last_hidden_state`. past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``): List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2, batch_size, num_heads, sequence_length, embed_size_per_head)`). Contains precomputed hidden-states (key and values in the attention blocks) of the decoder that can be used (see :obj:`past_key_values` input) to speed up sequential decoding. retrieved_doc_embeds (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs, hidden_size)`, `optional`, returned when `output_retrieved=True`): Embedded documents retrieved by the retriever. Is used with ``question_encoder_last_hidden_state`` to compute the ``doc_scores``. retrieved_doc_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, config.n_docs)`, `optional`, returned when `output_retrieved=True`): The indexes of the embedded documents retrieved by the retriever. context_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Input ids post-processed from the retrieved documents and the question encoder input_ids by the retriever. context_attention_mask (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Attention mask post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. question_encoder_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`): Sequence of hidden states at the output of the last layer of the question encoder pooled output of the model. question_enc_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the question encoder at the output of each layer plus the initial embedding outputs. question_enc_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the question encoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_enc_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`): Sequence of hidden-states at the output of the last layer of the generator encoder of the model. generator_enc_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the generator encoder at the output of each layer plus the initial embedding outputs. generator_enc_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the generator encoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_dec_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the generator decoder at the output of each layer plus the initial embedding outputs. generator_dec_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the generator decoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Cross-attentions weights of the generator decoder, after the attention softmax, used to compute the weighted average in the cross-attention heads. """ loss: Optional[torch.FloatTensor] = None logits: torch.FloatTensor = None doc_scores: torch.FloatTensor = None past_key_values: Optional[List[torch.FloatTensor]] = None retrieved_doc_embeds: Optional[torch.FloatTensor] = None retrieved_doc_ids: Optional[torch.LongTensor] = None context_input_ids: Optional[torch.LongTensor] = None context_attention_mask: Optional[torch.LongTensor] = None question_encoder_last_hidden_state: Optional[torch.FloatTensor] = None question_enc_hidden_states: Optional[Tuple[torch.FloatTensor]] = None question_enc_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_enc_last_hidden_state: Optional[torch.FloatTensor] = None generator_enc_hidden_states: Optional[Tuple[torch.FloatTensor]] = None generator_enc_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_dec_hidden_states: Optional[Tuple[torch.FloatTensor]] = None generator_dec_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_cross_attentions: Optional[Tuple[torch.FloatTensor]] = None
[docs]@dataclass class RetrievAugLMOutput(ModelOutput): """ Args: logits (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, config.vocab_size)`): Prediction scores of the language modeling head. The score is possibly marginalized over all documents for each vocabulary token. doc_scores (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs)`): Score between each retrieved document embeddings (see :obj:`retrieved_doc_embeds`) and :obj:`question_encoder_last_hidden_state`. past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``): List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2, batch_size, num_heads, sequence_length, embed_size_per_head)`). Contains precomputed hidden-states (key and values in the attention blocks) of the decoder that can be used (see :obj:`past_key_values` input) to speed up sequential decoding. retrieved_doc_embeds (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs, hidden_size)`, `optional`, returned when `output_retrieved=True`): Embedded documents retrieved by the retriever. Is used with ``question_encoder_last_hidden_state`` to compute the ``doc_scores``. retrieved_doc_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, config.n_docs)`, `optional`, returned when `output_retrieved=True`): The indexes of the embedded documents retrieved by the retriever. context_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Input ids post-processed from the retrieved documents and the question encoder input_ids by the retriever. context_attention_mask (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Attention mask post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. question_encoder_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`): Sequence of hidden states at the output of the last layer of the question encoder pooled output of the model. question_enc_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the question encoder at the output of each layer plus the initial embedding outputs. question_enc_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the question encoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_enc_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`): Sequence of hidden-states at the output of the last layer of the generator encoder of the model. generator_enc_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the generator encoder at the output of each layer plus the initial embedding outputs. generator_enc_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the generator encoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_dec_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``): Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings and one for the output of each layer) of shape :obj:`(batch_size, sequence_length, hidden_size)`. Hidden states of the generator decoder at the output of each layer plus the initial embedding outputs. generator_dec_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Attentions weights of the generator decoder, after the attention softmax, used to compute the weighted average in the self-attention heads. generator_cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``): Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_heads, sequence_length, sequence_length)`. Cross-attentions weights of the generator decoder, after the attention softmax, used to compute the weighted average in the cross-attention heads. """ logits: torch.FloatTensor = None doc_scores: torch.FloatTensor = None past_key_values: Optional[List[torch.FloatTensor]] = None retrieved_doc_embeds: Optional[torch.FloatTensor] = None retrieved_doc_ids: Optional[torch.LongTensor] = None context_input_ids: Optional[torch.LongTensor] = None context_attention_mask: Optional[torch.LongTensor] = None question_encoder_last_hidden_state: Optional[torch.FloatTensor] = None question_enc_hidden_states: Optional[Tuple[torch.FloatTensor]] = None question_enc_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_enc_last_hidden_state: Optional[torch.FloatTensor] = None generator_enc_hidden_states: Optional[Tuple[torch.FloatTensor]] = None generator_enc_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_dec_hidden_states: Optional[Tuple[torch.FloatTensor]] = None generator_dec_attentions: Optional[Tuple[torch.FloatTensor]] = None generator_cross_attentions: Optional[Tuple[torch.FloatTensor]] = None
class RagPreTrainedModel(PreTrainedModel): r""" RAG models were released with the paper `Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks <https://arxiv.org/abs/2005.11401>`_ by Patrick Lewis, Ethan Perez, Aleksandra Piktus et al. RAG is a retriever augmented model and encapsulate three components: a question encoder, a dataset retriever and a generator, the encoder and generator are trainable while the retriever is just an indexed dataset. """ config_class = RagConfig base_model_prefix = "rag" _keys_to_ignore_on_load_missing = [r"position_ids"] @classmethod def from_pretrained(cls, *args, **kwargs): # At the moment fast initialization is not supported # for composite models kwargs["_fast_init"] = False return super().from_pretrained(*args, **kwargs) @classmethod def from_pretrained_question_encoder_generator( cls, question_encoder_pretrained_model_name_or_path: str = None, generator_pretrained_model_name_or_path: str = None, retriever: RagRetriever = None, **kwargs ) -> PreTrainedModel: r""" Instantiates an question encoder and a generator from one or two base classes of the library from pretrained model checkpoints. The model is set in evaluation mode by default using :obj:`model.eval()` (Dropout modules are deactivated). To train the model, you need to first set it back in training mode with :obj:`model.train()`. Params: question_encoder_pretrained_model_name_or_path (:obj: `str`, `optional`, defaults to `None`): Information necessary to initiate the question encoder. Can be either: - A string, the `model id` of a pretrained model hosted inside a model repo on huggingface.co. Valid model ids can be located at the root-level, like ``bert-base-uncased``, or namespaced under a user or organization name, like ``dbmdz/bert-base-german-cased``. - A path to a `directory` containing model weights saved using :func:`~transformers.PreTrainedModel.save_pretrained`, e.g., ``./my_model_directory/``. - A path or url to a `tensorflow index checkpoint file` (e.g, ``./tf_model/model.ckpt.index``). In this case, ``from_tf`` should be set to :obj:`True` and a configuration object should be provided as ``config`` argument. This loading path is slower than converting the TensorFlow checkpoint in a PyTorch model using the provided conversion scripts and loading the PyTorch model afterwards. generator_pretrained_model_name_or_path (:obj: `str`, `optional`, defaults to `None`): Information necessary to initiate the generator. Can be either: - A string, the `model id` of a pretrained model hosted inside a model repo on huggingface.co. Valid model ids can be located at the root-level, like ``bert-base-uncased``, or namespaced under a user or organization name, like ``dbmdz/bert-base-german-cased``. - A path to a `directory` containing model weights saved using :func:`~transformers.PreTrainedModel.save_pretrained`, e.g., ``./my_model_directory/``. - A path or url to a `tensorflow index checkpoint file` (e.g, ``./tf_model/model.ckpt.index``). In this case, ``from_tf`` should be set to :obj:`True` and a configuration object should be provided as ``config`` argument. This loading path is slower than converting the TensorFlow checkpoint in a PyTorch model using the provided conversion scripts and loading the PyTorch model afterwards. model_args (remaining positional arguments, `optional`): All remaining positional arguments will be passed to the underlying model's ``__init__`` method. retriever (:class:`~transformers.RagRetriever`, `optional`): The retriever to use. kwwargs (remaining dictionary of keyword arguments, `optional`): Can be used to update the configuration object (after it being loaded) and initiate the model (e.g., ``output_attentions=True``). - To update the question_encoder configuration, use the prefix `question_encoder_` for each configuration parameter. - To update the generator configuration, use the prefix `generator_` for each configuration parameter. - To update the parent model configuration, do not use a prefix for each configuration parameter. Behaves differently depending on whether a :obj:`config` is provided or automatically loaded. Example:: >>> from transformers import RagModel >>> # initialize a RAG from two pretrained models. >>> model = RagModel.from_question_encoder_generator_pretrained('facebook/dpr-question_encoder-single-nq-base', 't5-small') >>> # saving model after fine-tuning >>> model.save_pretrained("./rag") >>> # load fine-tuned model >>> model = RagModel.from_pretrained("./rag") """ kwargs_question_encoder = { argument[len("question_encoder_") :]: value for argument, value in kwargs.items() if argument.startswith("question_encoder_") } kwargs_generator = { argument[len("generator_") :]: value for argument, value in kwargs.items() if argument.startswith("generator_") } # remove question_encoder, generator kwargs from kwargs for key in kwargs_question_encoder.keys(): del kwargs["question_encoder_" + key] for key in kwargs_generator.keys(): del kwargs["generator_" + key] # Load and initialize the question_encoder and generator # The distinction between question_encoder and generator at the model level is made # by the value of the flag `is_generator` that we need to set correctly. question_encoder = kwargs_question_encoder.pop("model", None) if question_encoder is None: assert ( question_encoder_pretrained_model_name_or_path is not None ), "If `model` is not defined as an argument, a `question_encoder_pretrained_model_name_or_path` has to be defined" from ..auto.modeling_auto import AutoModel if "config" not in kwargs_question_encoder: from ..auto.configuration_auto import AutoConfig question_encoder_config, kwargs_question_encoder = AutoConfig.from_pretrained( question_encoder_pretrained_model_name_or_path, **kwargs_question_encoder, return_unused_kwargs=True, ) kwargs_question_encoder["config"] = question_encoder_config question_encoder = AutoModel.from_pretrained( question_encoder_pretrained_model_name_or_path, **kwargs_question_encoder ) generator = kwargs_generator.pop("model", None) if generator is None: assert ( generator_pretrained_model_name_or_path is not None ), "If `generator_model` is not defined as an argument, a `generator_pretrained_model_name_or_path` has to be defined" from ..auto.modeling_auto import AutoModelForSeq2SeqLM if "config" not in kwargs_generator: from ..auto.configuration_auto import AutoConfig generator_config, kwargs_generator = AutoConfig.from_pretrained( generator_pretrained_model_name_or_path, **kwargs_generator, return_unused_kwargs=True ) kwargs_generator["config"] = generator_config generator = AutoModelForSeq2SeqLM.from_pretrained( generator_pretrained_model_name_or_path, **kwargs_generator ) # instantiate config with corresponding kwargs config = kwargs.get("config", None) if config is None: config = RagConfig.from_question_encoder_generator_configs( question_encoder.config, generator.config, **kwargs ) return cls(question_encoder=question_encoder, generator=generator, config=config, retriever=retriever) RAG_START_DOCSTRING = r""" RAG is a seq2seq model which encapsulates two core components: a question encoder and a generator. During a forward pass, we encode the input with the question encoder and pass it to the retriever to extract relevant context documents. The documents are then prepended to the input. Such contextualized inputs is passed to the generator. The question encoder can be any `autoencoding` model, preferably :class:`~transformers.DPRQuestionEncoder`, and the generator can be any `seq2seq` model, preferably :class:`~transformers.BartForConditionalGeneration`. The model can be initialized with a :class:`~transformers.RagRetriever` for end-to-end generation or used in combination with the outputs of a retriever in multiple steps---see examples for more details. The model is compatible any `autoencoding` model as the ``question_encoder`` and any `seq2seq` model with language model head as the ``generator``. It has been tested with :class:`~transformers.DPRQuestionEncoder` as the ``question_encoder`` and :class:`~transformers.BartForConditionalGeneration` or :class:`~transformers.T5ForConditionalGeneration` as the ``generator``. This model inherits from :class:`~transformers.PreTrainedModel`. Check the superclass documentation for the generic methods the library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads etc.) This model is also a PyTorch `torch.nn.Module <https://pytorch.org/docs/stable/nn.html#torch.nn.Module>`__ subclass. Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and behavior. Args: config (:class:`~transformers.RagConfig`): Model configuration class with all the parameters of the model. Initializing with a config file does not load the weights associated with the model, only the configuration. Check out the :meth:`~transformers.PreTrainedModel.from_pretrained` method to load the model weights. question_encoder (:class:`transformers.PreTrainedModel`): An encoder model compatible with the faiss index encapsulated by the ``retriever``. generator (:class:`transformers.PreTrainedModel`): A seq2seq model used as the generator in the RAG architecture. retriever (:class:`~transformers.RagRetriever`): A retriever class encapsulating a faiss index queried to obtain context documents for current inputs. """ RAG_FORWARD_INPUTS_DOCSTRING = r""" Args: input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`): Indices of input sequence tokens in the vocabulary. :class:`~transformers.RagConfig`, used to initialize the model, specifies which generator to use, it also specifies a compatible generator tokenizer. Use that tokenizer class to obtain the indices. `What are input IDs? <../glossary.html#input-ids>`__ attention_mask (:obj:`torch.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`): Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``: - 1 for tokens that are **not masked**, - 0 for tokens that are **masked**. `What are attention masks? <../glossary.html#attention-mask>`__ encoder_outputs (:obj:`tuple(tuple(torch.FloatTensor)`, `optional`) Tuple consists of (:obj:`generator_enc_last_hidden_state`, `optional`: :obj:`generator_enc_hidden_states`, `optional`: :obj:`generator_enc_attentions`). :obj:`generator_enc_last_hidden_state` of shape :obj:`(batch_size, n_docs * sequence_length, hidden_size)` is a sequence of hidden-states at the output of the last layer of the generator's encoder. Used by the (:class:`~transformers.RagModel`) model during decoding. decoder_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, target_sequence_length)`, `optional`): Provide for generation tasks. `None` by default, construct as per instructions for the generator model you're using with your RAG instance. decoder_attention_mask (:obj:`torch.BoolTensor` of shape :obj:`(batch_size, target_sequence_length)`, `optional`): Default behavior: generate a tensor that ignores pad tokens in :obj:`decoder_input_ids`. Causal mask will also be used by default. past_key_values (:obj:`tuple(tuple(torch.FloatTensor))`): Tuple consists of two elements: :obj:`encoder_outputs` of the RAG model (see :obj:`encoder_outputs`) and :obj:`past_key_values` of the underlying generator. Can be used to speed up decoding. :obj:`past_key_values` are used in the (:class:`~transformers.RagTokenForGeneration`) model during decoding. doc_scores (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs)`): Score between each retrieved document embeddings (see :obj:`retrieved_doc_embeds`) and :obj:`question_encoder_last_hidden_state`. If the model has is not initialized with a ``retriever`` :obj:`doc_scores` has to be provided to the forward pass. :obj:`doc_scores` can be computed via :obj:`question_encoder_last_hidden_state` and :obj:`retrieved_doc_embeds`, see examples for more information. context_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Input IDs post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. If the model has is not initialized with a ``retriever`` :obj:`context_input_ids` has to be provided to the forward pass. :obj:`context_input_ids` are returned by :meth:`~transformers.RagRetriever.__call__`. context_attention_mask (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Attention mask post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. If the model has is not initialized with a ``retriever`` :obj:`context_attention_mask` has to be provided to the forward pass. :obj:`context_attention_mask` are returned by :meth:`~transformers.RagRetriever.__call__`. use_cache (:obj:`bool`, `optional`, defaults to :obj:`True`): If set to :obj:`True`, :obj:`past_key_values` key value states are returned and can be used to speed up decoding (see :obj:`past_key_values`). output_attentions (:obj:`bool`, `optional`): Whether or not to return the attentions tensors of all attention layers. See ``attentions`` under returned tensors for more detail. output_hidden_states (:obj:`bool`, `optional`): Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for more detail. output_retrieved(:obj:`bool`, `optional`): Whether or not to return the :obj:`retrieved_doc_embeds`, :obj:`retrieved_doc_ids`, :obj:`context_input_ids` and :obj:`context_attention_mask`. See returned tensors for more detail. n_docs (:obj:`int`, `optional`, defaults to :obj:`config.n_docs`) Number of documents to retrieve and/or number of documents for which to generate an answer. """
[docs]@add_start_docstrings_to_model_forward(RAG_START_DOCSTRING) class RagModel(RagPreTrainedModel): def __init__( self, config: Optional[PretrainedConfig] = None, question_encoder: Optional[PreTrainedModel] = None, generator: Optional[PreTrainedModel] = None, retriever: Optional = None, # or maybe just use a `set_retriever(...)` method **kwargs, ): assert config is not None or ( question_encoder is not None and generator is not None ), "Either a configuration or an question_encoder and a generator has to be provided." if config is None: config = RagConfig.from_question_encoder_generator_configs( question_encoder.config, generator.config, **kwargs ) else: assert isinstance(config, self.config_class), f"config: {config} has to be of type {self.config_class}" super().__init__(config) if question_encoder is None: from ..auto.modeling_auto import AutoModel question_encoder = AutoModel.from_config(config.question_encoder) if generator is None: from ..auto.modeling_auto import AutoModelForSeq2SeqLM generator = AutoModelForSeq2SeqLM.from_config(config.generator) self.retriever = retriever if self.retriever is not None: assert isinstance( retriever, RagRetriever ), f"`self.retriever` is of type {type(self.retriever)}, but should be of type `RagRetriever`" self.retriever = retriever self.question_encoder = question_encoder self.generator = generator self.ctx_encoder = None self.context_encoder_training = False
[docs] @add_start_docstrings_to_model_forward(RAG_FORWARD_INPUTS_DOCSTRING) @replace_return_docstrings(output_type=RetrievAugLMOutput, config_class=_CONFIG_FOR_DOC) def forward( self, input_ids=None, attention_mask=None, encoder_outputs=None, decoder_input_ids=None, decoder_attention_mask=None, past_key_values=None, doc_scores=None, context_input_ids=None, context_attention_mask=None, use_cache=None, output_attentions=None, output_hidden_states=None, output_retrieved=None, n_docs=None, ): r""" Returns: Example:: >>> from transformers import RagTokenizer, RagRetriever, RagModel >>> import torch >>> tokenizer = RagTokenizer.from_pretrained("facebook/rag-token-base") >>> retriever = RagRetriever.from_pretrained("facebook/rag-token-base", index_name="exact", use_dummy_dataset=True) >>> # initialize with RagRetriever to do everything in one forward call >>> model = RagModel.from_pretrained("facebook/rag-token-base", retriever=retriever) >>> inputs = tokenizer("How many people live in Paris?", return_tensors="pt") >>> outputs = model(input_ids=inputs["input_ids"]) """ n_docs = n_docs if n_docs is not None else self.config.n_docs use_cache = use_cache if use_cache is not None else self.config.use_cache output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions output_hidden_states = ( output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states ) output_retrieved = output_retrieved if output_retrieved is not None else self.config.output_retrieved # whether retriever has to be used has_to_retrieve = ( self.retriever is not None and (context_input_ids is None or context_attention_mask is None or doc_scores is None) and encoder_outputs is None ) # encoder_outputs are pre-computed during RAG-token generation if encoder_outputs is None: if has_to_retrieve: question_enc_outputs = self.question_encoder( input_ids, attention_mask=attention_mask, return_dict=True ) question_encoder_last_hidden_state = question_enc_outputs[0] # hidden states of question encoder retriever_outputs = self.retriever( input_ids, question_encoder_last_hidden_state.cpu().detach().to(torch.float32).numpy(), prefix=self.generator.config.prefix, n_docs=n_docs, return_tensors="pt", ) if self.context_encoder_training: ( context_input_ids, context_attention_mask, retrieved_doc_embeds, retrived_doc_input_ids, retrived_doc_attention_mask, retrieved_doc_ids, ) = ( retriever_outputs["context_input_ids"], retriever_outputs["context_attention_mask"], retriever_outputs["retrieved_doc_embeds"], retriever_outputs["tokenized_doc_ids"], retriever_outputs["tokenized_doc_attention_mask"], retriever_outputs["doc_ids"], ) context_input_ids = context_input_ids.to(input_ids) context_attention_mask = context_attention_mask.to(input_ids) retrived_doc_input_ids = retrived_doc_input_ids.to(input_ids) retrived_doc_attention_mask = retrived_doc_attention_mask.to(input_ids) retrieved_doc_embeds = self.ctx_encoder( retrived_doc_input_ids, attention_mask=retrived_doc_attention_mask, return_dict=True ).pooler_output retrieved_doc_embeds = retrieved_doc_embeds.view( -1, n_docs, question_encoder_last_hidden_state.shape[1] ) # reshaping # compute doc_scores involving ctx_encoder doc_scores = torch.bmm( question_encoder_last_hidden_state.unsqueeze(1), retrieved_doc_embeds.transpose(1, 2) ).squeeze(1) else: context_input_ids, context_attention_mask, retrieved_doc_embeds, retrieved_doc_ids = ( retriever_outputs["context_input_ids"], retriever_outputs["context_attention_mask"], retriever_outputs["retrieved_doc_embeds"], retriever_outputs["doc_ids"], ) # set to correct device retrieved_doc_embeds = retrieved_doc_embeds.to(question_encoder_last_hidden_state) context_input_ids = context_input_ids.to(input_ids) context_attention_mask = context_attention_mask.to(input_ids) # compute doc_scores doc_scores = torch.bmm( question_encoder_last_hidden_state.unsqueeze(1), retrieved_doc_embeds.transpose(1, 2) ).squeeze(1) else: assert ( context_input_ids is not None ), "Make sure that `context_input_ids` are passed, if no `retriever` is set. Alternatively, you can set a retriever using the `set_retriever(...)` function." assert ( context_attention_mask is not None ), "Make sure that `context_attention_mask` are passed, if no `retriever` is set. Alternatively, you can set a retriever using the `set_retriever(...)` function." assert ( doc_scores is not None ), "Make sure that `doc_scores` are passed, if no `retriever` is set. Alternatively, you can set a retriever using the `set_retriever(...)` function." assert ( doc_scores is not None ), "Make sure that `doc_scores` are passed when passing `encoder_outputs` to the forward function." assert ( doc_scores.shape[1] % n_docs ) == 0, f" The first dimension of `context_input_ids` should be a multiple of `n_docs`={n_docs}, but is {context_input_ids.shape[0]}." # Decoder input without context documents if decoder_input_ids is not None: decoder_input_ids = decoder_input_ids.repeat_interleave(n_docs, dim=0) if decoder_attention_mask is not None: decoder_attention_mask = decoder_attention_mask.repeat_interleave(n_docs, dim=0) gen_outputs = self.generator( input_ids=context_input_ids, attention_mask=context_attention_mask, encoder_outputs=encoder_outputs, decoder_input_ids=decoder_input_ids, decoder_attention_mask=decoder_attention_mask, past_key_values=past_key_values, use_cache=use_cache, output_attentions=output_attentions, return_dict=True, ) if not has_to_retrieve: question_encoder_last_hidden_state = None question_enc_hidden_states = None question_enc_attentions = None retrieved_doc_embeds = None retrieved_doc_ids = None else: question_enc_hidden_states = question_enc_outputs.hidden_states question_enc_attentions = question_enc_outputs.attentions if not has_to_retrieve or not output_retrieved: # don't output retrieved docs context_input_ids = (None,) context_attention_mask = None retrieved_doc_embeds = None retrieved_doc_ids = None return RetrievAugLMOutput( logits=gen_outputs.logits, doc_scores=doc_scores, past_key_values=gen_outputs.past_key_values, context_input_ids=context_input_ids, context_attention_mask=context_attention_mask, retrieved_doc_embeds=retrieved_doc_embeds, retrieved_doc_ids=retrieved_doc_ids, question_encoder_last_hidden_state=question_encoder_last_hidden_state, question_enc_hidden_states=question_enc_hidden_states, question_enc_attentions=question_enc_attentions, generator_enc_last_hidden_state=gen_outputs.encoder_last_hidden_state, generator_enc_hidden_states=gen_outputs.encoder_hidden_states, generator_enc_attentions=gen_outputs.encoder_attentions, generator_dec_hidden_states=gen_outputs.decoder_hidden_states, generator_dec_attentions=gen_outputs.decoder_attentions, generator_cross_attentions=gen_outputs.cross_attentions, )
[docs]@add_start_docstrings_to_model_forward( """ A RAG-sequence model implementation. It performs RAG-sequence specific marginalization in the forward pass. """, RAG_START_DOCSTRING, ) class RagSequenceForGeneration(RagPreTrainedModel): def __init__( self, config: Optional[PretrainedConfig] = None, question_encoder: Optional[PreTrainedModel] = None, generator: Optional[PreTrainedModel] = None, retriever: Optional = None, **kwargs, ): assert config is not None or ( question_encoder is not None and generator is not None ), "Either a configuration or an encoder and a generator has to be provided." if config is None: config = RagConfig.from_question_encoder_generator_configs( question_encoder.config, generator.config, **kwargs ) super().__init__(config) # instantiate model self.rag = RagModel(config=config, question_encoder=question_encoder, generator=generator, retriever=retriever) def set_retriever(self, retriever: RagRetriever): self.rag.retriever = retriever def set_context_encoder_for_training(self, ctx_encoder: PreTrainedModel): self.rag.context_encoder_training = True self.rag.ctx_encoder = ctx_encoder
[docs] @add_start_docstrings_to_model_forward(RAG_FORWARD_INPUTS_DOCSTRING) @replace_return_docstrings(output_type=RetrievAugLMMarginOutput, config_class=_CONFIG_FOR_DOC) def forward( self, input_ids=None, attention_mask=None, encoder_outputs=None, decoder_input_ids=None, decoder_attention_mask=None, past_key_values=None, context_input_ids=None, context_attention_mask=None, doc_scores=None, use_cache=None, output_attentions=None, output_hidden_states=None, output_retrieved=None, exclude_bos_score=None, reduce_loss=None, labels=None, n_docs=None, **kwargs # needs kwargs for generation ): r""" exclude_bos_score (:obj:`bool`, `optional`): Only relevant if ``labels`` is passed. If :obj:`True`, the score of the BOS token is disregarded when computing the loss. reduce_loss (:obj:`bool`, `optional`): Only relevant if ``labels`` is passed. If :obj:`True`, the NLL loss is reduced using the ``torch.Tensor.sum`` operation. kwargs (:obj:`Dict[str, any]`, optional, defaults to `{}`): Legacy dictionary, which is required so that model can use `generate()` function. Returns: Example:: >>> from transformers import RagTokenizer, RagRetriever, RagSequenceForGeneration >>> import torch >>> tokenizer = RagTokenizer.from_pretrained("facebook/rag-sequence-nq") >>> retriever = RagRetriever.from_pretrained("facebook/rag-sequence-nq", index_name="exact", use_dummy_dataset=True) >>> # initialize with RagRetriever to do everything in one forward call >>> model = RagSequenceForGeneration.from_pretrained("facebook/rag-token-nq", retriever=retriever) >>> inputs = tokenizer("How many people live in Paris?", return_tensors="pt") >>> with tokenizer.as_target_tokenizer(): ... targets = tokenizer("In Paris, there are 10 million people.", return_tensors="pt") >>> input_ids = inputs["input_ids"] >>> labels = targets["input_ids"] >>> outputs = model(input_ids=input_ids, labels=labels) >>> # or use retriever separately >>> model = RagSequenceForGeneration.from_pretrained("facebook/rag-sequence-nq", use_dummy_dataset=True) >>> # 1. Encode >>> question_hidden_states = model.question_encoder(input_ids)[0] >>> # 2. Retrieve >>> docs_dict = retriever(input_ids.numpy(), question_hidden_states.detach().numpy(), return_tensors="pt") >>> doc_scores = torch.bmm(question_hidden_states.unsqueeze(1), docs_dict["retrieved_doc_embeds"].float().transpose(1, 2)).squeeze(1) >>> # 3. Forward to generator >>> outputs = model(context_input_ids=docs_dict["context_input_ids"], context_attention_mask=docs_dict["context_attention_mask"], doc_scores=doc_scores, decoder_input_ids=labels) """ n_docs = n_docs if n_docs is not None else self.config.n_docs exclude_bos_score = exclude_bos_score if exclude_bos_score is not None else self.config.exclude_bos_score reduce_loss = reduce_loss if reduce_loss is not None else self.config.reduce_loss if labels is not None: if decoder_input_ids is None: decoder_input_ids = labels use_cache = False outputs = self.rag( input_ids=input_ids, attention_mask=attention_mask, encoder_outputs=encoder_outputs, decoder_input_ids=decoder_input_ids, decoder_attention_mask=decoder_attention_mask, context_input_ids=context_input_ids, context_attention_mask=context_attention_mask, doc_scores=doc_scores, past_key_values=past_key_values, use_cache=use_cache, output_attentions=output_attentions, output_hidden_states=output_hidden_states, output_retrieved=output_retrieved, n_docs=n_docs, ) loss = None if labels is not None: loss = self.get_nll( outputs.logits, outputs.doc_scores, decoder_input_ids, reduce_loss=reduce_loss, epsilon=self.config.label_smoothing, exclude_bos_score=exclude_bos_score, n_docs=n_docs, ) return RetrievAugLMMarginOutput( loss=loss, logits=outputs.logits, doc_scores=outputs.doc_scores, past_key_values=outputs.past_key_values, context_input_ids=outputs.context_input_ids, context_attention_mask=outputs.context_attention_mask, retrieved_doc_embeds=outputs.retrieved_doc_embeds, retrieved_doc_ids=outputs.retrieved_doc_ids, question_encoder_last_hidden_state=outputs.question_encoder_last_hidden_state, question_enc_hidden_states=outputs.question_enc_hidden_states, question_enc_attentions=outputs.question_enc_attentions, generator_enc_last_hidden_state=outputs.generator_enc_last_hidden_state, generator_enc_hidden_states=outputs.generator_enc_hidden_states, generator_enc_attentions=outputs.generator_enc_attentions, generator_dec_hidden_states=outputs.generator_dec_hidden_states, generator_dec_attentions=outputs.generator_dec_attentions, generator_cross_attentions=outputs.generator_cross_attentions, )
@property def retriever(self): return self.rag.retriever @property def generator(self): return self.rag.generator @property def question_encoder(self): return self.rag.question_encoder
[docs] @torch.no_grad() def generate( self, input_ids: Optional[torch.LongTensor] = None, attention_mask: Optional[torch.LongTensor] = None, context_input_ids=None, context_attention_mask=None, doc_scores=None, do_deduplication=None, # defaults to True num_return_sequences=None, # defaults to 1 num_beams=None, # defaults to 1 n_docs=None, **model_kwargs ): """ Implements RAG sequence "thorough" decoding. Read the :meth:`~transformers.generation_utils.GenerationMixin.generate`` documentation for more information on how to set other generate input parameters. Args: input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`, `optional`): The sequence used as a prompt for the generation. If :obj:`input_ids` is not passed, then :obj:`context_input_ids` has to be provided. attention_mask (:obj:`torch.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`): Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``: - 1 for tokens that are **not masked**, - 0 for tokens that are **masked**. `What are attention masks? <../glossary.html#attention-mask>`__ context_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Input IDs post-processed from the retrieved documents and the question encoder input_ids by the retriever. context_attention_mask (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Attention mask post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. If the model is not initialized with a ``retriever`` or ``input_ids`` is not given, :obj:`context_input_ids` and :obj:`context_attention_mask` have to be provided to the forward pass. They are returned by :meth:`~transformers.RagRetriever.__call__`. doc_scores (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs)`): Score between each retrieved document embeddings (see :obj:`retrieved_doc_embeds`) and :obj:`question_encoder_last_hidden_state`. If the model is not initialized with a ``retriever`` or ``input_ids`` is not given, :obj:`doc_scores` has to be provided to the forward pass. :obj:`doc_scores` are returned by :meth:`~transformers.RagRetriever.__call__`. do_deduplication (:obj:`bool`, `optional`): Whether or not to deduplicate the generations from different context documents for a given input. Has to be set to :obj:`False` if used while training with distributed backend. num_return_sequences(:obj:`int`, `optional`, defaults to 1): The number of independently computed returned sequences for each element in the batch. Note that this is not the value we pass to the ``generator``'s `:func:`~transformers.generation_utils.GenerationMixin.generate`` function, where we set ``num_return_sequences`` to :obj:`num_beams`. num_beams (:obj:`int`, `optional`, defaults to 1): Number of beams for beam search. 1 means no beam search. n_docs (:obj:`int`, `optional`, defaults to :obj:`config.n_docs`) Number of documents to retrieve and/or number of documents for which to generate an answer. kwargs: Additional kwargs will be passed to :meth:`~transformers.generation_utils.GenerationMixin.generate`. Return: :obj:`torch.LongTensor` of shape :obj:`(batch_size * num_return_sequences, sequence_length)`: The generated sequences. The second dimension (sequence length) is either equal to :obj:`max_length` or shorter if all batches finished early due to the :obj:`eos_token_id`. """ n_docs = n_docs if n_docs is not None else self.config.n_docs do_deduplication = do_deduplication if do_deduplication is not None else self.config.do_deduplication num_doc_return_sequences = ( num_return_sequences if num_return_sequences is not None else self.config.num_return_sequences ) num_beams = num_beams if num_beams is not None else self.config.num_beams assert ( input_ids is not None or context_input_ids is not None ), " At least one of input_ids or context_input_ids must be given" if self.retriever is not None and context_input_ids is None: question_hidden_states = self.question_encoder(input_ids, attention_mask=attention_mask)[0] context_input_ids = self.retriever( input_ids, question_hidden_states.cpu().detach().to(torch.float32).numpy(), prefix=self.generator.config.prefix, n_docs=n_docs, return_tensors="pt", )["context_input_ids"] # set to correct device context_input_ids = context_input_ids.to(input_ids) hypos = [] model_kwargs["num_beams"] = num_beams model_kwargs["num_return_sequences"] = num_beams model_kwargs["attention_mask"] = None batch_size = input_ids.shape[0] if input_ids is not None else context_input_ids.shape[0] // n_docs for index in range(batch_size): # first, generate beams from documents: generator_input_ids = context_input_ids[index * n_docs : (index + 1) * n_docs] # (n_docs, max_len) output_sequences = self.generator.generate( generator_input_ids, **model_kwargs, ) # n_docs * n_beam, tgt_len if do_deduplication: # do_deduplication, max_output_len output_sequences = torch.stack(list({str(k.tolist()): k for k in output_sequences}.values())) num_candidates = output_sequences.shape[ 0 ] # after deduplication, this number can be less than n_docs*n_beam # then, run model forwards to get nll scores: if input_ids is not None: new_input_ids = input_ids[index : index + 1].repeat(num_candidates, 1) outputs = self(new_input_ids, labels=output_sequences, exclude_bos_score=True) else: # input_ids is None, need context_input_ids/mask and doc_scores assert ( context_attention_mask is not None ), "Make sure that `context_attention_mask` are passed, if no `input_ids` is set. Alternatively, you can set a retriever using the `set_retriever(...)` function." assert ( doc_scores is not None ), "Make sure that `doc_scores` are passed, if no `input_ids` is set. Alternatively, you can set a retriever using the `set_retriever(...)` function." individual_input_ids = generator_input_ids.repeat( num_candidates, 1 ) # (num_candidates*n_docs, max_len) individual_attention_mask = context_attention_mask[index * n_docs : (index + 1) * n_docs] individual_attention_mask = individual_attention_mask.repeat(num_candidates, 1) individual_doc_scores = doc_scores[index : (index + 1), :] # doc_scores.shape = [batch, n_docs] individual_doc_scores = individual_doc_scores.repeat(num_candidates, 1) # [num_candidates, n_docs] outputs = self( context_input_ids=individual_input_ids, context_attention_mask=individual_attention_mask, doc_scores=individual_doc_scores, labels=output_sequences, exclude_bos_score=True, ) top_cand_inds = (-outputs["loss"]).topk(num_doc_return_sequences)[1] # add hypothesis hypos.append(output_sequences[top_cand_inds]) return self._cat_and_pad(hypos, pad_token_id=self.config.generator.pad_token_id)
def get_nll( self, seq_logits, doc_scores, target, reduce_loss=False, epsilon=0.0, exclude_bos_score=False, n_docs=None ): # shift tokens left target = torch.cat( [target[:, 1:], target.new(target.shape[0], 1).fill_(self.config.generator.pad_token_id)], 1 ) n_docs = n_docs if n_docs is not None else self.config.n_docs # bos_token_id is None for T5 bos_token_id = self.config.bos_token_id or self.config.generator.bos_token_id use_bos = bos_token_id is not None and target[:, 0].eq(bos_token_id).all() def _mask_pads(ll, smooth_obj): pad_mask = target.eq(self.config.generator.pad_token_id) if pad_mask.any(): ll.masked_fill_(pad_mask, 0.0) smooth_obj.masked_fill_(pad_mask, 0.0) return ll.squeeze(-1), smooth_obj.squeeze(-1) # seq_logits dim = (batch*n_docs, tgt_len , #vocabs) seq_logprobs = nn.functional.log_softmax(seq_logits, dim=-1).view( seq_logits.shape[0] // n_docs, n_docs, -1, seq_logits.size(-1) ) # batch_size x n_docs x tgt_len x #vocab_size doc_logprobs = nn.functional.log_softmax(doc_scores, dim=1).unsqueeze(-1).unsqueeze(-1) # RAG-sequence marginalization first_token_scores = seq_logprobs[:, :, :1, :] second_token_scores = seq_logprobs[:, :, 1:2, :] remainder = seq_logprobs[:, :, 2:, :] rag_logprobs = torch.cat([first_token_scores, second_token_scores + doc_logprobs, remainder], dim=2) # calculate loss target = target.unsqueeze(1).unsqueeze(-1).repeat(1, n_docs, 1, 1) assert target.dim() == rag_logprobs.dim() ll = rag_logprobs.gather(dim=-1, index=target) smooth_obj = rag_logprobs.sum(dim=-1, keepdim=True) # total sum of all (normalised) logits ll, smooth_obj = _mask_pads(ll, smooth_obj) # sum over tokens, exclude bos while scoring ll = ll[:, :, 1:].sum(2) if exclude_bos_score and use_bos else ll.sum(2) smooth_obj = smooth_obj.sum(2) ll = ll.logsumexp(1) # logsumexp over docs smooth_obj = smooth_obj.logsumexp(1) nll_loss = -ll smooth_loss = -smooth_obj if reduce_loss: nll_loss = nll_loss.sum() smooth_loss = smooth_loss.sum() eps_i = epsilon / rag_logprobs.size(-1) loss = (1.0 - epsilon) * nll_loss + eps_i * smooth_loss return loss @staticmethod def _cat_and_pad(tensors, pad_token_id): output = ( tensors[0].new(sum([t.shape[0] for t in tensors]), max([t.shape[1] for t in tensors])).fill_(pad_token_id) ) ind = 0 for t in tensors: output[ind : ind + t.shape[0], : t.shape[1]] = t ind += t.shape[0] return output
[docs]@add_start_docstrings_to_model_forward( """ A RAG-token model implementation. It performs RAG-token specific marginalization in the forward pass. """, RAG_START_DOCSTRING, ) class RagTokenForGeneration(RagPreTrainedModel): def __init__( self, config: Optional[PretrainedConfig] = None, question_encoder: Optional[PreTrainedModel] = None, generator: Optional[PreTrainedModel] = None, retriever: Optional = None, **kwargs, ): assert config is not None or ( question_encoder is not None and generator is not None ), "Either a configuration or an encoder and a generator has to be provided." if config is None: config = RagConfig.from_question_encoder_generator_configs( question_encoder.config, generator.config, **kwargs ) super().__init__(config) # instantiate model self.rag = RagModel(config=config, question_encoder=question_encoder, generator=generator, retriever=retriever) def set_retriever(self, retriever: RagRetriever): self.rag.retriever = retriever def set_context_encoder_for_training(self, ctx_encoder: PreTrainedModel): self.rag.context_encoder_training = True self.rag.ctx_encoder = ctx_encoder def prepare_inputs_for_generation( self, decoder_input_ids, past=None, attention_mask=None, use_cache=None, encoder_outputs=None, doc_scores=None, n_docs=None, **kwargs ): if past is not None: # if past is defined use only last decoder_input_ids decoder_input_ids = decoder_input_ids[:, -1:] return { "input_ids": None, "encoder_outputs": encoder_outputs, "doc_scores": doc_scores, "context_attention_mask": attention_mask, "decoder_input_ids": decoder_input_ids, "past_key_values": past, "use_cache": use_cache, "do_marginalize": True, "n_docs": n_docs, } @property def retriever(self): return self.rag.retriever @property def generator(self): return self.rag.generator @property def question_encoder(self): return self.rag.question_encoder @staticmethod def _reorder_cache(past, beam_idx): """Reorders cache for generation. BART-inspired but we need to take care of the extra dimension for docs""" def _reorder_stacked(hidden_states, new_order): n_docs = hidden_states.shape[0] // new_order.shape[0] hidden_states = hidden_states.view(-1, n_docs, *hidden_states.shape[1:]) hidden_states = hidden_states.index_select(0, new_order) result = hidden_states.view(-1, *hidden_states.shape[2:]) return result reordered_past = () for layer_past in past: # get the correct batch idx from decoder layer's batch dim for cross and self-attn reordered_past += (tuple(_reorder_stacked(past_state, beam_idx) for past_state in layer_past),) return reordered_past def marginalize(self, seq_logits, doc_scores, n_docs=None): n_docs = n_docs if n_docs is not None else self.config.n_docs # RAG-token marginalization seq_logprobs = nn.functional.log_softmax(seq_logits, dim=-1).view( seq_logits.shape[0] // n_docs, n_docs, -1, seq_logits.size(-1) ) doc_logprobs = torch.log_softmax(doc_scores, dim=1) log_prob_sum = seq_logprobs + doc_logprobs.unsqueeze(-1).unsqueeze(-1) return torch.logsumexp(log_prob_sum, dim=1)
[docs] @add_start_docstrings_to_model_forward(RAG_FORWARD_INPUTS_DOCSTRING) @replace_return_docstrings(output_type=RetrievAugLMMarginOutput, config_class=_CONFIG_FOR_DOC) def forward( self, input_ids=None, attention_mask=None, encoder_outputs=None, decoder_input_ids=None, decoder_attention_mask=None, past_key_values=None, context_input_ids=None, context_attention_mask=None, doc_scores=None, use_cache=None, output_attentions=None, output_hidden_states=None, output_retrieved=None, do_marginalize=None, reduce_loss=None, labels=None, n_docs=None, **kwargs # needs kwargs for generation ): r""" do_marginalize (:obj:`bool`, `optional`): If :obj:`True`, the logits are marginalized over all documents by making use of ``torch.nn.functional.log_softmax``. reduce_loss (:obj:`bool`, `optional`): Only relevant if ``labels`` is passed. If :obj:`True`, the NLL loss is reduced using the ``torch.Tensor.sum`` operation. kwargs (:obj:`Dict[str, any]`, optional, defaults to `{}`): Legacy dictionary, which is required so that model can use `generate()` function. Returns: Example:: >>> from transformers import RagTokenizer, RagRetriever, RagTokenForGeneration >>> import torch >>> tokenizer = RagTokenizer.from_pretrained("facebook/rag-token-nq") >>> retriever = RagRetriever.from_pretrained("facebook/rag-token-nq", index_name="exact", use_dummy_dataset=True) >>> # initialize with RagRetriever to do everything in one forward call >>> model = RagTokenForGeneration.from_pretrained("facebook/rag-token-nq", retriever=retriever) >>> inputs = tokenizer("How many people live in Paris?", return_tensors="pt") >>> with tokenizer.as_target_tokenizer(): ... targets = tokenizer("In Paris, there are 10 million people.", return_tensors="pt") >>> input_ids = inputs["input_ids"] >>> labels = targets["input_ids"] >>> outputs = model(input_ids=input_ids, labels=labels) >>> # or use retriever separately >>> model = RagTokenForGeneration.from_pretrained("facebook/rag-token-nq", use_dummy_dataset=True) >>> # 1. Encode >>> question_hidden_states = model.question_encoder(input_ids)[0] >>> # 2. Retrieve >>> docs_dict = retriever(input_ids.numpy(), question_hidden_states.detach().numpy(), return_tensors="pt") >>> doc_scores = torch.bmm(question_hidden_states.unsqueeze(1), docs_dict["retrieved_doc_embeds"].float().transpose(1, 2)).squeeze(1) >>> # 3. Forward to generator >>> outputs = model(context_input_ids=docs_dict["context_input_ids"], context_attention_mask=docs_dict["context_attention_mask"], doc_scores=doc_scores, decoder_input_ids=labels) >>> # or directly generate >>> generated = model.generate(context_input_ids=docs_dict["context_input_ids"], context_attention_mask=docs_dict["context_attention_mask"], doc_scores=doc_scores) >>> generated_string = tokenizer.batch_decode(generated, skip_special_tokens=True) """ n_docs = n_docs if n_docs is not None else self.config.n_docs do_marginalize = do_marginalize if do_marginalize is not None else self.config.do_marginalize reduce_loss = reduce_loss if reduce_loss is not None else self.config.reduce_loss if labels is not None: if decoder_input_ids is None: decoder_input_ids = labels use_cache = False outputs = self.rag( input_ids=input_ids, attention_mask=attention_mask, encoder_outputs=encoder_outputs, decoder_input_ids=decoder_input_ids, decoder_attention_mask=decoder_attention_mask, context_input_ids=context_input_ids, context_attention_mask=context_attention_mask, doc_scores=doc_scores, past_key_values=past_key_values, use_cache=use_cache, output_attentions=output_attentions, output_hidden_states=output_hidden_states, output_retrieved=output_retrieved, n_docs=n_docs, ) loss = None logits = outputs.logits if labels is not None: assert decoder_input_ids is not None loss = self.get_nll( outputs.logits, outputs.doc_scores, labels, reduce_loss=reduce_loss, epsilon=self.config.label_smoothing, n_docs=n_docs, ) if do_marginalize: logits = self.marginalize(logits, outputs.doc_scores, n_docs) return RetrievAugLMMarginOutput( loss=loss, logits=logits, doc_scores=outputs.doc_scores, past_key_values=outputs.past_key_values, context_input_ids=outputs.context_input_ids, context_attention_mask=outputs.context_attention_mask, retrieved_doc_embeds=outputs.retrieved_doc_embeds, retrieved_doc_ids=outputs.retrieved_doc_ids, question_encoder_last_hidden_state=outputs.question_encoder_last_hidden_state, question_enc_hidden_states=outputs.question_enc_hidden_states, question_enc_attentions=outputs.question_enc_attentions, generator_enc_last_hidden_state=outputs.generator_enc_last_hidden_state, generator_enc_hidden_states=outputs.generator_enc_hidden_states, generator_enc_attentions=outputs.generator_enc_attentions, generator_dec_hidden_states=outputs.generator_dec_hidden_states, generator_dec_attentions=outputs.generator_dec_attentions, generator_cross_attentions=outputs.generator_cross_attentions, )
[docs] @torch.no_grad() def generate( self, input_ids: Optional[torch.LongTensor] = None, attention_mask: Optional[torch.LongTensor] = None, context_input_ids=None, context_attention_mask=None, doc_scores=None, max_length=None, min_length=None, early_stopping=None, use_cache=None, num_beams=None, num_beam_groups=None, diversity_penalty=None, bos_token_id=None, pad_token_id=None, eos_token_id=None, length_penalty=None, no_repeat_ngram_size=None, encoder_no_repeat_ngram_size=None, repetition_penalty=None, bad_words_ids=None, num_return_sequences=None, decoder_start_token_id=None, n_docs=None, prefix_allowed_tokens_fn: Callable[[int, torch.Tensor], List[int]] = None, forced_bos_token_id: Optional[int] = None, forced_eos_token_id: Optional[int] = None, remove_invalid_values: Optional[bool] = None, **model_kwargs ): """ Implements RAG token decoding. Args: input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`, `optional`): The sequence used as a prompt for the generation. If :obj:`input_ids` is not passed, then :obj:`context_input_ids` has to be provided. attention_mask (:obj:`torch.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`): Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``: - 1 for tokens that are **not masked**, - 0 for tokens that are **masked**. `What are attention masks? <../glossary.html#attention-mask>`__ context_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Input IDs post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. If the model has is not initialized with a ``retriever``, :obj:`context_input_ids` has to be provided to the forward pass. :obj:`context_input_ids` are returned by :meth:`~transformers.RagRetriever.__call__`. context_attention_mask (:obj:`torch.LongTensor` of shape :obj:`(batch_size * config.n_docs, config.max_combined_length)`, `optional`, returned when `output_retrieved=True`): Attention mask post-processed from the retrieved documents and the question encoder :obj:`input_ids` by the retriever. If the model has is not initialized with a ``retriever``, :obj:`context_input_ids` has to be provided to the forward pass. :obj:`context_input_ids` are returned by :meth:`~transformers.RagRetriever.__call__`. doc_scores (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, config.n_docs)`): Score between each retrieved document embeddings (see :obj:`retrieved_doc_embeds`) and :obj:`question_encoder_last_hidden_state`. If the model has is not initialized with a ``retriever``, :obj:`context_input_ids` has to be provided to the forward pass. :obj:`context_input_ids` are returned by :meth:`~transformers.RagRetriever.__call__`. max_length (:obj:`int`, `optional`, defaults to 20): The maximum length of the sequence to be generated. min_length (:obj:`int`, `optional`, defaults to 10): The minimum length of the sequence to be generated. early_stopping (:obj:`bool`, `optional`, defaults to :obj:`False`): Whether or not to stop the beam search when at least ``num_beams`` sentences are finished per batch or not. use_cache: (:obj:`bool`, `optional`, defaults to :obj:`True`): Whether or not the model should use the past last key/values attentions (if applicable to the model) to speed up decoding. pad_token_id (:obj:`int`, `optional`): The id of the `padding` token. bos_token_id (:obj:`int`, `optional`): The id of the `beginning-of-sequence` token. eos_token_id (:obj:`int`, `optional`): The id of the `end-of-sequence` token. length_penalty (:obj:`float`, `optional`, defaults to 1.0): Exponential penalty to the length. 1.0 means no penalty. Set to values < 1.0 in order to encourage the model to generate shorter sequences, to a value > 1.0 in order to encourage the model to produce longer sequences. no_repeat_ngram_size (:obj:`int`, `optional`, defaults to 0): If set to int > 0, all ngrams of that size can only occur once. encoder_no_repeat_ngram_size (:obj:`int`, `optional`, defaults to 0): If set to int > 0, all ngrams of that size that occur in the ``encoder_input_ids`` cannot occur in the ``decoder_input_ids``. bad_words_ids(:obj:`List[int]`, `optional`): List of token ids that are not allowed to be generated. In order to get the tokens of the words that should not appear in the generated text, use :obj:`tokenizer.encode(bad_word, add_prefix_space=True)`. num_beams (:obj:`int`, `optional`, defaults to 1): Number of beams for beam search. 1 means no beam search. num_beam_groups (:obj:`int`, `optional`, defaults to 1): Number of groups to divide :obj:`num_beams` into in order to ensure diversity among different groups of beams. `this paper <https://arxiv.org/pdf/1610.02424.pdf>`__ for more details. diversity_penalty (:obj:`float`, `optional`, defaults to 0.0): This value is subtracted from a beam's score if it generates a token same as any beam from other group at a particular time. Note that :obj:`diversity_penalty` is only effective if ``group beam search`` is enabled. num_return_sequences(:obj:`int`, `optional`, defaults to 1): The number of independently computed returned sequences for each element in the batch. Note that this is not the value we pass to the ``generator``'s `:func:`~transformers.generation_utils.GenerationMixin.generate` function, where we set ``num_return_sequences`` to :obj:`num_beams`. decoder_start_token_id (:obj:`int`, `optional`): If an encoder-decoder model starts decoding with a different token than `bos`, the id of that token. n_docs (:obj:`int`, `optional`, defaults to :obj:`config.n_docs`) Number of documents to retrieve and/or number of documents for which to generate an answer. prefix_allowed_tokens_fn: (:obj:`Callable[[int, torch.Tensor], List[int]]`, `optional`): If provided, this function constraints the beam search to allowed tokens only at each step. If not provided no constraint is applied. This function takes 2 arguments :obj:`inputs_ids` and the batch ID :obj:`batch_id`. It has to return a list with the allowed tokens for the next generation step conditioned on the previously generated tokens :obj:`inputs_ids` and the batch ID :obj:`batch_id`. This argument is useful for constrained generation conditioned on the prefix, as described in `Autoregressive Entity Retrieval <https://arxiv.org/abs/2010.00904>`__. forced_bos_token_id (:obj:`int`, `optional`): The id of the token to force as the first generated token after the :obj:`decoder_start_token_id`. Useful for multilingual models like :doc:`mBART <../model_doc/mbart>` where the first generated token needs to be the target language token. forced_eos_token_id (:obj:`int`, `optional`): The id of the token to force as the last generated token when :obj:`max_length` is reached. remove_invalid_values (:obj:`bool`, `optional`): Whether to remove possible `nan` and `inf` outputs of the model to prevent the generation method to crash. Note that using ``remove_invalid_values`` can slow down generation. Return: :obj:`torch.LongTensor` of shape :obj:`(batch_size * num_return_sequences, sequence_length)`: The generated sequences. The second dimension (sequence_length) is either equal to :obj:`max_length` or shorter if all batches finished early due to the :obj:`eos_token_id`. """ # set default parameters n_docs = n_docs if n_docs is not None else self.config.n_docs num_beams = num_beams if num_beams is not None else self.config.num_beams num_beam_groups = num_beam_groups if num_beam_groups is not None else self.config.num_beam_groups max_length = max_length if max_length is not None else self.config.max_length num_return_sequences = ( num_return_sequences if num_return_sequences is not None else self.config.num_return_sequences ) bos_token_id = bos_token_id if bos_token_id is not None else self.config.generator.bos_token_id eos_token_id = eos_token_id if eos_token_id is not None else self.config.generator.eos_token_id pad_token_id = pad_token_id if pad_token_id is not None else self.config.generator.pad_token_id use_cache = use_cache if use_cache is not None else self.config.use_cache decoder_start_token_id = ( decoder_start_token_id if decoder_start_token_id is not None else self.config.generator.decoder_start_token_id ) remove_invalid_values = ( remove_invalid_values if remove_invalid_values is not None else self.config.remove_invalid_values ) # retrieve docs if self.retriever is not None and context_input_ids is None: question_hidden_states = self.question_encoder(input_ids, attention_mask=attention_mask)[0] out = self.retriever( input_ids, question_hidden_states.cpu().detach().to(torch.float32).numpy(), prefix=self.generator.config.prefix, n_docs=n_docs, return_tensors="pt", ) context_input_ids, context_attention_mask, retrieved_doc_embeds = ( out["context_input_ids"], out["context_attention_mask"], out["retrieved_doc_embeds"], ) # set to correct device retrieved_doc_embeds = retrieved_doc_embeds.to(question_hidden_states) context_input_ids = context_input_ids.to(input_ids) context_attention_mask = context_attention_mask.to(input_ids) # compute doc_scores doc_scores = torch.bmm(question_hidden_states.unsqueeze(1), retrieved_doc_embeds.transpose(1, 2)).squeeze( 1 ) assert ( context_input_ids.shape[0] % n_docs ) == 0, f" The first dimension of `context_input_ids` should be a multiple of `n_docs`={n_docs}, but is {context_input_ids.shape[0]}." # batch_size batch_size = context_input_ids.shape[0] // n_docs encoder = self.rag.generator.get_encoder() encoder_outputs = encoder(input_ids=context_input_ids, attention_mask=context_attention_mask, return_dict=True) input_ids = torch.full( (batch_size * num_beams, 1), decoder_start_token_id, dtype=torch.long, device=next(self.parameters()).device, ) last_hidden_state = encoder_outputs["last_hidden_state"] def extend_enc_output(tensor, num_beams=None): # split into `batch_size`, `num_beams`, `num_docs` tensor = tensor[None, None, :].reshape((batch_size, 1, n_docs) + tensor.shape[1:]) # repeat same last hidden states over `num_beams` dimension tensor = tensor.expand((batch_size, num_beams, n_docs) + tensor.shape[3:]) # merge `batch_size`, `num_beams`, `num_docs` dims again return tensor.reshape((batch_size * num_beams * n_docs,) + tensor.shape[3:]) # correctly extend last_hidden_state and attention mask context_attention_mask = extend_enc_output(context_attention_mask, num_beams=num_beams) encoder_outputs["last_hidden_state"] = extend_enc_output(last_hidden_state, num_beams=num_beams) doc_scores = doc_scores.repeat_interleave(num_beams, dim=0) # define start_len & additional parameters model_kwargs["doc_scores"] = doc_scores model_kwargs["encoder_outputs"] = encoder_outputs model_kwargs["attention_mask"] = context_attention_mask model_kwargs["n_docs"] = n_docs pre_processor = self._get_logits_processor( repetition_penalty=repetition_penalty, no_repeat_ngram_size=no_repeat_ngram_size, encoder_no_repeat_ngram_size=encoder_no_repeat_ngram_size, encoder_input_ids=context_input_ids, bad_words_ids=bad_words_ids, min_length=min_length, max_length=max_length, eos_token_id=eos_token_id, forced_bos_token_id=forced_bos_token_id, forced_eos_token_id=forced_eos_token_id, prefix_allowed_tokens_fn=prefix_allowed_tokens_fn, num_beams=num_beams, num_beam_groups=num_beam_groups, diversity_penalty=diversity_penalty, remove_invalid_values=remove_invalid_values, ) if num_beams == 1: if num_return_sequences > 1: raise ValueError( f"num_return_sequences has to be 1, but is {num_return_sequences} when doing greedy search." ) return self.greedy_search( input_ids, logits_processor=pre_processor, max_length=max_length, pad_token_id=pad_token_id, eos_token_id=eos_token_id, **model_kwargs, ) elif num_beams > 1: length_penalty = length_penalty if length_penalty is not None else self.config.length_penalty early_stopping = early_stopping if early_stopping is not None else self.config.early_stopping if num_return_sequences > num_beams: raise ValueError("`num_return_sequences` has to be smaller or equal to `num_beams`.") beam_scorer = BeamSearchScorer( batch_size=batch_size, num_beams=num_beams, device=self.device, length_penalty=length_penalty, do_early_stopping=early_stopping, num_beam_hyps_to_keep=num_return_sequences, ) return self.beam_search( input_ids, beam_scorer, logits_processor=pre_processor, max_length=max_length, pad_token_id=pad_token_id, eos_token_id=eos_token_id, **model_kwargs, ) else: raise ValueError(f"`num_beams` has to be an integer strictly superior to 0 (≥ 1), but is {num_beams}")
def get_input_embeddings(self): return self.rag.generator.get_input_embeddings() def get_output_embeddings(self): return self.rag.generator.get_output_embeddings() def set_output_embeddings(self, new_embeddings): return self.rag.generator.set_output_embeddings(new_embeddings) def shift_tokens_right(self, input_ids, start_token_id=None): """Shift input ids one token to the right, and pad with start_token_id""" if start_token_id is None: start_token_id = self.config.decoder_start_token_id shifted_input_ids = input_ids.new_zeros(input_ids.shape) shifted_input_ids[:, 1:] = input_ids[:, :-1].clone() shifted_input_ids[:, 0] = start_token_id return shifted_input_ids def get_nll(self, seq_logits, doc_scores, target, reduce_loss=False, epsilon=0.0, n_docs=None): n_docs = n_docs if n_docs is not None else self.config.n_docs # shift tokens left target = torch.cat( [target[:, 1:], target.new(target.shape[0], 1).fill_(self.config.generator.pad_token_id)], 1 ) def _mask_pads(ll, smooth_obj): pad_mask = target.eq(self.config.generator.pad_token_id) if pad_mask.any(): ll.masked_fill_(pad_mask, 0.0) smooth_obj.masked_fill_(pad_mask, 0.0) return ll.squeeze(-1), smooth_obj.squeeze(-1) rag_logprobs = self.marginalize(seq_logits, doc_scores, n_docs) target = target.unsqueeze(-1) assert target.dim() == rag_logprobs.dim() ll = rag_logprobs.gather(dim=-1, index=target) smooth_obj = rag_logprobs.sum(dim=-1, keepdim=True) # total sum of all (normalised) logits ll, smooth_obj = _mask_pads(ll, smooth_obj) ll = ll.sum(1) # sum over tokens smooth_obj = smooth_obj.sum(1) nll_loss = -ll smooth_loss = -smooth_obj if reduce_loss: nll_loss = nll_loss.sum() smooth_loss = smooth_loss.sum() eps_i = epsilon / rag_logprobs.size(-1) loss = (1.0 - epsilon) * nll_loss + eps_i * smooth_loss return loss