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Findings of EMNLP 2024 - LRSL

An implementation for Logits Reranking via Semantic Labels for Hard Samples in Text Classification (LRSL)

This repository provides the implementation of Logits Reranking via Semantic Labels for Hard Samples in Text Classification (LRSL), a method designed to enhance text classification performance, especially for hard samples, by leveraging label semantics and similarity-based reranking.

Key Features

  1. Model-agnostic: Works with any pre-trained language model (e.g., BERT, RoBERTa, Llama).
  2. Hard Sample Detection: Automatically identifies challenging samples with a variance-based metric.
  3. Semantic Reranking: Refines logits of hard samples using semantic distances computed from fine-tuned embeddings.

Steps to Reproduce

Step 1: Prepare a Fine-Tuned Model

Use a well-trained classification model, fine-tuned on your dataset.

Step 2: Extract Top-k Logits

Perform inference on the training dataset to extract the top-k logits for each sample. These logits serve as a basis for fine-tuning the text embeddings.

Step 3: Fine-Tune Text Embedding

Utilize the training dataset to fine-tune a text embedding model. The embedding is trained to map text samples and semantic labels into a shared representation space using a triplet-based loss.

Step 4: Perform Similarity-Based Reranking

4.1 Compute Variance for Hard Sample Detection

Use a portion of the dataset (e.g., training or validation set) to calculate the variance (Var) of logits distributions as a measure of confidence.

4.2 Rerank Test Samples

  • Automatically detect hard samples in the test dataset based on the sigma^2_mis metric.
  • Rerank the logits of these samples using their cosine similarity with fine-tuned text embeddings for improved classification accuracy.

File Description

datasets

finetune-text-embedding

llms-cls-qlora

bert-cls

Citation

@inproceedings{huang-etal-2024-logits,
    title = "Logits Reranking via Semantic Labels for Hard Samples in Text Classification",
    author = "Huang, Peijie  and
      Huang, Junbao  and
      Xu, Yuhong  and
      Li, Weizhen  and
      Xiao, Xisheng",
    editor = "Al-Onaizan, Yaser  and
      Bansal, Mohit  and
      Chen, Yun-Nung",
    booktitle = "Findings of the Association for Computational Linguistics: EMNLP 2024",
    month = nov,
    year = "2024",
    address = "Miami, Florida, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2024.findings-emnlp.657",
    doi = "10.18653/v1/2024.findings-emnlp.657",
    pages = "11250--11262",
}