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--- |
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license: mit |
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datasets: |
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- KomeijiForce/Inbedder-Pretrain-Data |
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language: |
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- en |
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--- |
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# [ACL2024] Answer is All You Need: Instruction-following Text Embedding via Answering the Question |
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InBedder🛌 is a text embedder that is designed to follow instructions. Instruction-following text embedder can capture characteristics of texts specified by user instructions. InBedder offers a novel viewpoint that treats the instruction as a question about the input text and encodes the expected answers to obtain the representation accordingly. We show that InBedder is aware of instructions with different evaluation tasks. |
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The following is a use case from [https://github.com/zhang-yu-wei/InBedder/blob/main/UseCase.ipynb](https://github.com/zhang-yu-wei/InBedder/blob/main/UseCase.ipynb) |
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```python |
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import torch |
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from torch import nn |
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from torch.nn.functional import gelu, cosine_similarity |
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from transformers import AutoTokenizer, AutoModel, AutoModelForMaskedLM |
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import numpy as np |
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class InBedder(): |
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def __init__(self, path='KomeijiForce/inbedder-roberta-large', device='cuda:0'): |
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model = AutoModelForMaskedLM.from_pretrained(path) |
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self.tokenizer = AutoTokenizer.from_pretrained(path) |
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self.model = model.roberta |
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self.dense = model.lm_head.dense |
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self.layer_norm = model.lm_head.layer_norm |
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self.device = torch.device(device) |
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self.model = self.model.to(self.device) |
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self.dense = self.dense.to(self.device) |
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self.layer_norm = self.layer_norm.to(self.device) |
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self.vocab = self.tokenizer.get_vocab() |
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self.vocab = {self.vocab[key]:key for key in self.vocab} |
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def encode(self, input_texts, instruction, n_mask): |
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if type(instruction) == str: |
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prompts = [instruction + self.tokenizer.mask_token*n_mask for input_text in input_texts] |
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elif type(instruction) == list: |
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prompts = [inst + self.tokenizer.mask_token*n_mask for inst in instruction] |
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inputs = self.tokenizer(input_texts, prompts, padding=True, truncation=True, return_tensors='pt').to(self.device) |
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mask = inputs.input_ids.eq(self.tokenizer.mask_token_id) |
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outputs = self.model(**inputs) |
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logits = outputs.last_hidden_state[mask] |
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logits = self.layer_norm(gelu(self.dense(logits))) |
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logits = logits.reshape(len(input_texts), n_mask, -1) |
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logits = logits.mean(1) |
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logits = (logits - logits.mean(1, keepdim=True)) / logits.std(1, keepdim=True) |
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return logits |
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inbedder = InBedder(path='KomeijiForce/inbedder-roberta-large', device='cpu') |
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texts = ["I love cat!", "I love dog!", "I dislike cat!"] |
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instruction = "What is the animal mentioned here?" |
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embeddings = inbedder.encode(texts, instruction, 3) |
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cosine_similarity(embeddings[:1], embeddings[1:], dim=1) |
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# tensor([0.9374, 0.9917], grad_fn=<SumBackward1>) |
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texts = ["I love cat!", "I love dog!", "I dislike cat!"] |
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instruction = "What is emotion expressed here?" |
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embeddings = inbedder.encode(texts, instruction, 3) |
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cosine_similarity(embeddings[:1], embeddings[1:], dim=1) |
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# tensor([0.9859, 0.8537], grad_fn=<SumBackward1>) |
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``` |
