wehub-resource-sync
568 lines
24 KiB
Python
568 lines
24 KiB
Python
from tqdm import tqdm, trange
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from typing import cast, Any, List, Union, Optional
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import queue
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from multiprocessing import Queue
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import gc
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import torch
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import numpy as np
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from transformers import AutoModel, AutoTokenizer
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from FlagEmbedding.abc.inference import AbsEmbedder
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# Pooling function for LLM-based embedding models
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def last_token_pool(last_hidden_states: torch.Tensor,
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attention_mask: torch.Tensor) -> torch.Tensor:
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"""Last token pooling method.
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Args:
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last_hidden_state (torch.Tensor): The last hidden state of the model.
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attention_mask (torch.Tensor): Attention mask. Defaults to :data:`None`.
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Returns:
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torch.Tensor: The embedding vectors after pooling.
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"""
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left_padding = (attention_mask[:, -1].sum() == attention_mask.shape[0])
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if left_padding:
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return last_hidden_states[:, -1]
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else:
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sequence_lengths = attention_mask.sum(dim=1) - 1
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batch_size = last_hidden_states.shape[0]
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return last_hidden_states[torch.arange(batch_size, device=last_hidden_states.device), sequence_lengths]
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class ICLLLMEmbedder(AbsEmbedder):
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"""
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Embedder class for BGE-EN-icl.
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Args:
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model_name_or_path (str): If it's a path to a local model, it loads the model from the path. Otherwise tries to download and
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load a model from HuggingFace Hub with the name.
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normalize_embeddings (bool, optional): If True, normalize the embedding vector. Defaults to :data:`True`.
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use_fp16 (bool, optional) If true, use half-precision floating-point to speed up computation with a slight performance
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degradation. Defaults to :data:`True`.
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query_instruction_for_retrieval (Optional[str], optional): Query instruction for retrieval tasks, which will be used with
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with :attr:`query_instruction_format`. Defaults to :data:`None`.
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query_instruction_format (str, optional): The template for :attr:`query_instruction_for_retrieval`. Defaults to :data:`"{}{}"`.
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devices (Optional[Union[str, int, List[str], List[int]]], optional): Devices to use for model inference. Defaults to :data:`None`.
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examples_for_task (Optional[List[dict]], optional): Few-shot examples for the model to enhance model's ability.
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Defaults to :data:`None`.
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examples_instruction_format (str, optional): Example format when using :attr:`examples_for_task`.
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trust_remote_code (bool, optional): trust_remote_code for HF datasets or models. Defaults to :data:`False`.
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cache_dir (Optional[str], optional): Cache directory for the model. Defaults to :data:`None`.
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batch_size (int, optional): Batch size for inference. Defaults to :data:`256`.
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query_max_length (int, optional): Maximum length for query. Defaults to :data:`512`.
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passage_max_length (int, optional): Maximum length for passage. Defaults to :data:`512`.
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convert_to_numpy (bool, optional): If True, the output embedding will be a Numpy array. Otherwise, it will be a Torch Tensor.
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Defaults to :data:`True`.
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Attributes:
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DEFAULT_POOLING_METHOD: The default pooling method when running the model.
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"""
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DEFAULT_POOLING_METHOD = "last_token"
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def __init__(
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self,
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model_name_or_path: str,
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normalize_embeddings: bool = True,
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use_fp16: bool = True,
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use_bf16: bool = False,
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query_instruction_for_retrieval: Optional[str] = None,
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query_instruction_format: str = "<instruct>{}\n<query>{}", # specify the format of query_instruction_for_retrieval
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suffix: str = '\n<response>',
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devices: Optional[Union[str, List[str]]] = None, # specify devices, such as "cuda:0" or ["cuda:0", "cuda:1"]
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# Additional parameters for ICLLLMEmbedder
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examples_for_task: Optional[List[dict]] = None,
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examples_instruction_format: str = "<instruct>{}\n<query>{}\n<response>{}", # specify the format of examples_for_task
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trust_remote_code: bool = False,
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cache_dir: Optional[str] = None,
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# inference
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batch_size: int = 256,
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query_max_length: int = 512,
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passage_max_length: int = 512,
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convert_to_numpy: bool = True,
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truncate_dim: Optional[int] = None,
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**kwargs: Any,
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):
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query_instruction_format = query_instruction_format.replace('\\n', '\n')
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examples_instruction_format = examples_instruction_format.replace('\\n', '\n')
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super().__init__(
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model_name_or_path,
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normalize_embeddings=normalize_embeddings,
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use_fp16=use_fp16,
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use_bf16=use_bf16,
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query_instruction_for_retrieval=query_instruction_for_retrieval,
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query_instruction_format=query_instruction_format,
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devices=devices,
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batch_size=batch_size,
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query_max_length=query_max_length,
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passage_max_length=passage_max_length,
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convert_to_numpy=convert_to_numpy,
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truncate_dim=truncate_dim,
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**kwargs
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)
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self.tokenizer = AutoTokenizer.from_pretrained(
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model_name_or_path,
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trust_remote_code=trust_remote_code,
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cache_dir=cache_dir
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)
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self.model = AutoModel.from_pretrained(
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model_name_or_path,
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trust_remote_code=trust_remote_code,
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cache_dir=cache_dir,
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torch_dtype=self.get_model_torch_dtype(),
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)
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self.examples_for_task = examples_for_task
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self.examples_instruction_format = examples_instruction_format
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if self.kwargs.get("pooling_method", "last_token") != "last_token":
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raise ValueError("Pooling method must be 'last_token' for LLM-based models.")
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self.set_examples()
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self.suffix = suffix
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self.query_pool = None
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def __del__(self):
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self.stop_self_pool()
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self.stop_self_query_pool()
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def set_examples(self, examples_for_task: Optional[List[dict]] = None):
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"""Set the prefix to the provided examples.
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Args:
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examples_for_task (Optional[List[dict]], optional): Few-shot examples for the model to enhance model's ability.
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Defaults to :data:`None`.
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"""
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if examples_for_task is None and self.examples_for_task is None:
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self.prefix = ''
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elif examples_for_task is not None:
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eg_paris = []
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for i in range(len(examples_for_task)):
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eg_paris.append(
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self.get_detailed_example(
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self.examples_instruction_format,
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examples_for_task[i].get('instruct', self.query_instruction_for_retrieval),
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examples_for_task[i].get('query', ''),
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examples_for_task[i].get('response', '')
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)
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)
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self.prefix = '\n\n'.join(eg_paris) + '\n\n'
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else:
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eg_paris = []
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for i in range(len(self.examples_for_task)):
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eg_paris.append(
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self.get_detailed_example(
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self.examples_instruction_format,
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self.examples_for_task[i].get('instruct', self.query_instruction_for_retrieval),
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self.examples_for_task[i].get('query', ''),
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self.examples_for_task[i].get('response', '')
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)
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)
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self.prefix = '\n\n'.join(eg_paris) + '\n\n'
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@staticmethod
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def get_detailed_example(instruction_format: str, instruction: str, query: str, response: str):
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"""Combine the instruction and sentence along with the instruction format.
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Args:
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instruction_format (str): Format for instruction.
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instruction (str): The text of instruction.
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query (str): The text of example query.
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response (str): The text of example response.
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Returns:
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str: The complete example following the given format.
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"""
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if "\\n" in instruction_format:
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instruction_format = instruction_format.replace("\\n", "\n")
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return instruction_format.format(instruction, query, response)
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def stop_self_query_pool(self):
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if self.query_pool is not None:
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self.stop_multi_process_pool(self.query_pool)
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self.query_pool = None
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try:
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self.model.to('cpu')
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torch.cuda.empty_cache()
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except:
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pass
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gc.collect()
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def encode_queries(
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self,
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queries: Union[List[str], str],
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batch_size: Optional[int] = None,
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max_length: Optional[int] = None,
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convert_to_numpy: Optional[bool] = None,
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**kwargs: Any
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) -> Union[np.ndarray, torch.Tensor]:
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"""Encode the queries.
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Args:
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queries (Union[List[str], str]): Input queries to encode.
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batch_size (Optional[int], optional): Number of sentences for each iter. Defaults to :data:`None`.
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max_length (Optional[int], optional): Maximum length of tokens. Defaults to :data:`None`.
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convert_to_numpy (Optional[bool], optional): If True, the output embedding will be a Numpy array. Otherwise, it will
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be a Torch Tensor. Defaults to :data:`None`.
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Returns:
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Union[torch.Tensor, np.ndarray]: Return the embedding vectors in a numpy array or tensor.
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"""
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if batch_size is None: batch_size = self.batch_size
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if max_length is None: max_length = self.query_max_length
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if convert_to_numpy is None: convert_to_numpy = self.convert_to_numpy
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if isinstance(queries, str) or len(self.target_devices) == 1:
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return self.encode_queries_single_device(
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queries,
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batch_size=batch_size,
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max_length=max_length,
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convert_to_numpy=convert_to_numpy,
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device=self.target_devices[0],
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**kwargs
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)
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self.stop_self_pool()
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if self.query_pool is None:
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self.query_pool = self.start_multi_process_pool(ICLLLMEmbedder._encode_queries_multi_process_worker)
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embeddings = self.encode_multi_process(
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queries,
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self.query_pool,
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batch_size=batch_size,
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max_length=max_length,
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convert_to_numpy=convert_to_numpy,
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**kwargs
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)
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return embeddings
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def encode_corpus(
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self,
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corpus: Union[List[str], str],
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batch_size: Optional[int] = None,
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max_length: Optional[int] = None,
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convert_to_numpy: Optional[bool] = None,
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**kwargs: Any
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) -> Union[np.ndarray, torch.Tensor]:
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"""Encode the corpus.
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Args:
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corpus (Union[List[str], str]): Input corpus to encode.
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batch_size (Optional[int], optional): Number of sentences for each iter. Defaults to :data:`None`.
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max_length (Optional[int], optional): Maximum length of tokens. Defaults to :data:`None`.
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convert_to_numpy (Optional[bool], optional): If True, the output embedding will be a Numpy array. Otherwise, it will
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be a Torch Tensor. Defaults to :data:`None`.
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Returns:
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Union[torch.Tensor, np.ndarray]: Return the embedding vectors in a numpy array or tensor.
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"""
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self.stop_self_query_pool()
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return super().encode_corpus(
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corpus,
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batch_size=batch_size,
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max_length=max_length,
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convert_to_numpy=convert_to_numpy,
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**kwargs
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)
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def encode(
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self,
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sentences: Union[List[str], str],
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batch_size: Optional[int] = None,
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max_length: Optional[int] = None,
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convert_to_numpy: Optional[bool] = None,
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**kwargs: Any
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) -> Union[np.ndarray, torch.Tensor]:
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"""Encode the input sentences with the embedding model.
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Args:
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sentences (Union[List[str], str]): Input sentences to encode.
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batch_size (Optional[int], optional): Number of sentences for each iter. Defaults to :data:`None`.
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max_length (Optional[int], optional): Maximum length of tokens. Defaults to :data:`None`.
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convert_to_numpy (Optional[bool], optional): If True, the output embedding will be a Numpy array. Otherwise, it will
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be a Torch Tensor. Defaults to :data:`None`.
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Returns:
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Union[torch.Tensor, np.ndarray]: return the embedding vectors in a numpy array or tensor.
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"""
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return super().encode(
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sentences,
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batch_size=batch_size,
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max_length=max_length,
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convert_to_numpy=convert_to_numpy,
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**kwargs
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)
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# adapted from https://github.com/UKPLab/sentence-transformers/blob/1802076d4eae42ff0a5629e1b04e75785d4e193b/sentence_transformers/SentenceTransformer.py#L976
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@staticmethod
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def _encode_queries_multi_process_worker(
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target_device: str, model: 'ICLLLMEmbedder', input_queue: Queue, results_queue: Queue
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) -> None:
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"""
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Internal working process to encode sentences in multi-process setup
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"""
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while True:
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try:
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chunk_id, sentences, kwargs = (
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input_queue.get()
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)
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embeddings = model.encode_queries_single_device(
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sentences,
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device=target_device,
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**kwargs
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)
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results_queue.put([chunk_id, embeddings])
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except queue.Empty:
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break
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@torch.no_grad()
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def encode_queries_single_device(
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self,
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queries: Union[List[str], str],
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batch_size: int = 256,
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max_length: int = 512,
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convert_to_numpy: bool = True,
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device: Optional[str] = None,
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**kwargs: Any
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):
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"""Encode queries by a single device.
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Args:
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queries (Union[List[str], str]): Input queries to encode.
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batch_size (int, optional): Number of queries for each iter. Defaults to :data:`256`.
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max_length (int, optional): Maximum length of tokens. Defaults to :data:`512`.
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convert_to_numpy (bool, optional): If True, the output embedding will be a Numpy array. Otherwise, it will
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be a Torch Tensor. Defaults to :data:`True`.
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device (Optional[str], optional): Device to use for encoding. Defaults to None.
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Returns:
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Union[torch.Tensor, np.ndarray]: return the embedding vectors in a numpy array or tensor.
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"""
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if device is None:
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device = self.target_devices[0]
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if device == "cpu":
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self.model.float()
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self.model.to(device)
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self.model.eval()
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input_was_string = False
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if isinstance(queries, str):
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queries = [queries]
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input_was_string = True
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if self.query_instruction_for_retrieval is not None:
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if isinstance(queries, str):
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input_texts = self.get_detailed_instruct(self.query_instruction_format, self.query_instruction_for_retrieval, queries)
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else:
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input_texts = [self.get_detailed_instruct(self.query_instruction_format, self.query_instruction_for_retrieval, query) for query in queries]
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else:
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input_texts = queries
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prefix_ids = self.tokenizer(self.prefix, add_special_tokens=False)['input_ids']
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suffix_ids = self.tokenizer(self.suffix, add_special_tokens=False)['input_ids']
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_len_1 = len(self.tokenizer('<s>', add_special_tokens=False)['input_ids'])
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_len_2 = len(self.tokenizer(f'{self.suffix}</s>', add_special_tokens=False)['input_ids'])
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new_max_length = (len(prefix_ids) + len(suffix_ids) + max_length + 8) // 8 * 8 + 8
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# tokenize without padding to get the correct length
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all_inputs = []
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for start_index in trange(0, len(input_texts), batch_size, desc='pre tokenize',
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disable=len(input_texts) < batch_size):
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sentences_batch = input_texts[start_index:start_index + batch_size]
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inputs_batch = self.tokenizer(
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sentences_batch,
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truncation=True,
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max_length=max_length - _len_1 - _len_2,
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add_special_tokens=False,
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**kwargs
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)
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sentences_batch = self.tokenizer.batch_decode(inputs_batch['input_ids'])
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for i in range(len(sentences_batch)):
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sentences_batch[i] = self.prefix + sentences_batch[i] + self.suffix
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inputs_batch = self.tokenizer(
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sentences_batch,
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truncation=True,
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max_length=new_max_length,
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**kwargs
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)
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inputs_batch = [{
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k: inputs_batch[k][i] for k in inputs_batch.keys()
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} for i in range(len(sentences_batch))]
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all_inputs.extend(inputs_batch)
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# sort by length for less padding
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length_sorted_idx = np.argsort([-len(x['input_ids']) for x in all_inputs])
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all_inputs_sorted = [all_inputs[i] for i in length_sorted_idx]
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sentences_sorted = [input_texts[i] for i in length_sorted_idx]
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# adjust batch size
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flag = False
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while flag is False:
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try:
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inputs_batch = self.tokenizer.pad(
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all_inputs_sorted[: batch_size],
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padding=True,
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return_tensors='pt',
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**kwargs
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).to(device)
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last_hidden_state = self.model(**inputs_batch, return_dict=True).last_hidden_state
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embeddings = last_token_pool(last_hidden_state, inputs_batch['attention_mask'])
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flag = True
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except RuntimeError as e:
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batch_size = batch_size * 3 // 4
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except torch.cuda.OutOfMemoryError as e:
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batch_size = batch_size * 3 // 4
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# encode
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all_embeddings = []
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for start_index in tqdm(range(0, len(sentences_sorted), batch_size), desc="Inference Embeddings",
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disable=len(sentences_sorted) < batch_size):
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inputs_batch = all_inputs_sorted[start_index:start_index + batch_size]
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inputs_batch = self.tokenizer.pad(
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inputs_batch,
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padding=True,
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return_tensors='pt',
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**kwargs
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).to(device)
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last_hidden_state = self.model(**inputs_batch, return_dict=True).last_hidden_state
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embeddings = last_token_pool(last_hidden_state, inputs_batch['attention_mask'])
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embeddings = self._truncate_embeddings(embeddings)
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if self.normalize_embeddings:
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embeddings = torch.nn.functional.normalize(embeddings, dim=-1)
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embeddings = cast(torch.Tensor, embeddings)
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if convert_to_numpy:
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embeddings = self._convert_to_numpy(embeddings, device=device)
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all_embeddings.append(embeddings)
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if convert_to_numpy:
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all_embeddings = np.concatenate(all_embeddings, axis=0)
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else:
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all_embeddings = torch.cat(all_embeddings, dim=0)
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# adjust the order of embeddings
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all_embeddings = all_embeddings[np.argsort(length_sorted_idx)]
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# return the embeddings
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if input_was_string:
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return all_embeddings[0]
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return all_embeddings
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@torch.no_grad()
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def encode_single_device(
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self,
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sentences: Union[List[str], str],
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batch_size: int = 256,
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max_length: int = 512,
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convert_to_numpy: bool = True,
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device: Optional[str] = None,
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**kwargs: Any
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):
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"""Encode input sentences by a single device.
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Args:
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sentences (Union[List[str], str]): Input sentences to encode.
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batch_size (int, optional): Number of sentences for each iter. Defaults to :data:`256`.
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max_length (int, optional): Maximum length of tokens. Defaults to :data:`512`.
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convert_to_numpy (bool, optional): If True, the output embedding will be a Numpy array. Otherwise, it will
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be a Torch Tensor. Defaults to :data:`True`.
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device (Optional[str], optional): Device to use for encoding. Defaults to None.
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Returns:
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Union[torch.Tensor, np.ndarray]: return the embedding vectors in a numpy array or tensor.
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"""
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if device is None:
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device = self.target_devices[0]
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if device == "cpu":
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self.model.float()
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self.model.to(device)
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self.model.eval()
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input_was_string = False
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if isinstance(sentences, str):
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sentences = [sentences]
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input_was_string = True
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# tokenize without padding to get the correct length
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all_inputs = []
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for start_index in trange(0, len(sentences), batch_size, desc='pre tokenize',
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disable=len(sentences) < batch_size):
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sentences_batch = sentences[start_index:start_index + batch_size]
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inputs_batch = self.tokenizer(
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sentences_batch,
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truncation=True,
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max_length=max_length,
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**kwargs
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)
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inputs_batch = [{
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k: inputs_batch[k][i] for k in inputs_batch.keys()
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} for i in range(len(sentences_batch))]
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all_inputs.extend(inputs_batch)
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# sort by length for less padding
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length_sorted_idx = np.argsort([-len(x['input_ids']) for x in all_inputs])
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all_inputs_sorted = [all_inputs[i] for i in length_sorted_idx]
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# adjust batch size
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flag = False
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while flag is False:
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try:
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inputs_batch = self.tokenizer.pad(
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all_inputs_sorted[: batch_size],
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padding=True,
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return_tensors='pt',
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**kwargs
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).to(device)
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last_hidden_state = self.model(**inputs_batch, return_dict=True).last_hidden_state
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embeddings = last_token_pool(last_hidden_state, inputs_batch['attention_mask'])
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flag = True
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except RuntimeError as e:
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batch_size = batch_size * 3 // 4
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except torch.cuda.OutOfMemoryError as e:
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batch_size = batch_size * 3 // 4
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# encode
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all_embeddings = []
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for start_index in tqdm(range(0, len(sentences), batch_size), desc="Inference Embeddings",
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disable=len(sentences) < batch_size):
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inputs_batch = all_inputs_sorted[start_index:start_index + batch_size]
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inputs_batch = self.tokenizer.pad(
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inputs_batch,
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padding=True,
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return_tensors='pt',
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**kwargs
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).to(device)
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last_hidden_state = self.model(**inputs_batch, return_dict=True).last_hidden_state
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embeddings = last_token_pool(last_hidden_state, inputs_batch['attention_mask'])
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embeddings = self._truncate_embeddings(embeddings)
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if self.normalize_embeddings:
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embeddings = torch.nn.functional.normalize(embeddings, dim=-1)
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embeddings = cast(torch.Tensor, embeddings)
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if convert_to_numpy:
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embeddings = self._convert_to_numpy(embeddings, device=device)
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all_embeddings.append(embeddings)
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if convert_to_numpy:
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all_embeddings = np.concatenate(all_embeddings, axis=0)
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else:
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all_embeddings = torch.cat(all_embeddings, dim=0)
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# adjust the order of embeddings
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all_embeddings = all_embeddings[np.argsort(length_sorted_idx)]
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# return the embeddings
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if input_was_string:
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return all_embeddings[0]
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return all_embeddings
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