E5-base-4k

A continuación se muestra un ejemplo para codificar consultas y pasajes del conjunto de datos de clasificación de pasajes de MS-MARCO.

import torch
import torch.nn.functional as F

from torch import Tensor
from transformers import AutoTokenizer, AutoModel

def average_pool(last_hidden_states: Tensor, attention_mask: Tensor) -> Tensor:
    last_hidden = last_hidden_states.masked_fill(~attention_mask[..., None].bool(), 0.0)
    return last_hidden.sum(dim=1) / attention_mask.sum(dim=1)[..., None]

def get_position_ids(input_ids: Tensor, max_original_positions: int=512, encode_max_length: int=4096) -> Tensor:
    position_ids = list(range(input_ids.size(1)))
    factor = max(encode_max_length // max_original_positions, 1)
    position_ids = [pid * factor for pid in position_ids]
    
    position_ids = torch.tensor(position_ids, dtype=torch.long)
    position_ids = position_ids.unsqueeze(0).expand_as(input_ids)
    return position_ids

# Cada texto de entrada debe comenzar con "query: " o "passage: ".
# Para tareas distintas a la recuperación, puede simplemente usar el prefijo "query: ".
input_texts = ['query: how much protein should a female eat',
               'query: summit define',
               "passage: As a general guideline, the CDC's average requirement of protein for women ages 19 to 70 is 46 grams per day. But, as you can see from this chart, you'll need to increase that if you're expecting or training for a marathon. Check out the chart below to see how much protein you should be eating each day.",
               "passage: Definition of summit for English Language Learners. : 1  the highest point of a mountain : the top of a mountain. : 2  the highest level. : 3  a meeting or series of meetings between the leaders of two or more governments."]

tokenizer = AutoTokenizer.from_pretrained('dwzhu/e5-base-4k')
model = AutoModel.from_pretrained('dwzhu/e5-base-4k')

# Tokenizar los textos de entrada
batch_dict = tokenizer(input_texts, max_length=4096, padding=True, truncation=True, return_tensors='pt')
batch_dict['position_ids'] = get_position_ids(batch_dict['input_ids'], max_original_positions=512, encode_max_length=4096)

outputs = model(**batch_dict)
embeddings = average_pool(outputs.last_hidden_state, batch_dict['attention_mask'])

# normalizar incrustaciones
embeddings = F.normalize(embeddings, p=2, dim=1)
scores = (embeddings[:2] @ embeddings[2:].T) * 100
print(scores.tolist())