Challenge: Large language models (LLMs) have great potential for synthetic data generation.
Approach: They show that large language models can generate useful data even for complex tasks . they use a symmetric task difficulty asymmetry to prompt an LLM to generate plausible input text for a target output structure.
Outcome: The proposed approach outperforms existing models by a substantial margin on closed information extraction tasks with 1.8M data points and 770M parameters.

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Synthetic Data Generation with Large Language Models for Text Classification: Potential and Limitations (2023.emnlp-main)

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Challenge: Recent studies have explored using large language models to generate synthetic datasets . however, the effectiveness of the LLM-generated synthetic data is inconsistent across different classification tasks.
Approach: They propose to use large language models to generate synthetic datasets to better understand factors that moderate the effectiveness of LLM-generated synthetic data.
Outcome: The results show that subjectivity is negatively associated with the performance of the model trained on synthetic data.
Better as Generators Than Classifiers: Leveraging LLMs and Synthetic Data for Low-Resource Multilingual Classification (2026.findings-eacl)

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Challenge: Large Language Models (LLMs) have demonstrated remarkable multilingual capabilities, making them promising tools in both high- and low-resource languages.
Approach: They use a multilingual LLM to generate synthetic datasets covering 11 languages and 4 classification tasks and use them to train smaller models.
Outcome: The proposed model outperforms the large generator in low-resource languages and tasks.
Synthetic Data in the Era of Large Language Models (2025.acl-tutorials)

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Challenge: 'synthetic data' is a data generated with the assistance of large language models to make dataset construction faster and cheaper.
Approach: This tutorial seeks to build a shared understanding of recent progress in synthetic data generation from NLP and related fields by grouping and describing major methods, applications, and open problems.
Outcome: This tutorial will describe methods, applications, and open problems that have been developed and are being used to improve the quality and efficiency of synthetic data generation.
Evaluating Language Models as Synthetic Data Generators (2025.acl-long)

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Challenge: Prior studies have focused on developing effective data generation methods, but lack systematic comparison of different LMs as data generators in a unified setting.
Approach: They propose to use a benchmark to compare language models' data generation abilities against a set of standardized settings and metrics.
Outcome: The proposed benchmark provides standardized settings and metrics to evaluate LMs’ data generation abilities.
On LLMs-Driven Synthetic Data Generation, Curation, and Evaluation: A Survey (2024.findings-acl)

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Challenge: Large Language Models (LLMs) provide a data-centric solution to alleviate limitations of real-world data with synthetic data generation.
Approach: They propose a generic workflow for LLM-driven synthetic data generation.
Outcome: The proposed workflows highlight gaps in existing research and outline avenues for future studies.
Scaling Low-Resource MT via Synthetic Data Generation with LLMs (2025.emnlp-main)

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Challenge: a recent study has shown that LLM-generated synthetic data can improve low-resource machine translation performance . traditional data augmentation techniques like back-translation preserve the human-written target and synthesize the other .
Approach: They construct a document-level synthetic corpus from English Europarl and extend it via pivoting to 147 additional language pairs.
Outcome: The proposed model can significantly improve low-resource machine translation performance even when noisy.
Demystifying Synthetic Data in LLM Pre-training: A Systematic Study of Scaling Laws, Benefits, and Pitfalls (2025.emnlp-main)

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Challenge: a large-scale empirical study compares natural web data, diverse synthetic types, and mixtures of natural and synthetic data.
Approach: They conduct a large-scale empirical study on large-volume LLMs using a unified protocol and scaling laws.
Outcome: The proposed method is faster than pre-training on natural web data, the authors show . their results are consistent with previous studies on rephrased text and textbooks .
Synthesizing Text-to-SQL Data from Weak and Strong LLMs (2024.acl-long)

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Challenge: a capability gap exists between open-source and closed-source large language models (LLMs) . the adoption of closed-sourced LLMs introduces concerns pertaining to openness, privacy, and substantial costs.
Approach: They propose a synthetic data approach that combines strong and weak models for error information . they demonstrate the effectiveness of SENSE, a specialized text-to-SQL model .
Outcome: The proposed method enhances the domain generalization of text-to-SQL models and explores the potential of error data supervision through preference learning.
On Synthetic Data Strategies for Domain-Specific Generative Retrieval (2025.acl-long)

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Challenge: Generative retrieval models can be used to generate ranked lists of potentially relevant document identifiers for a user query.
Approach: They propose a synthetic data generation strategy for a two-stage training framework that focuses on learning to decode document identifiers from queries and a strategy for mining hard negatives based on initial model's predictions.
Outcome: The proposed model can generate ranked lists of potentially relevant document identifiers for a user query and then refine ranking through preference learning.
Let’s Synthesize Step by Step: Iterative Dataset Synthesis with Large Language Models by Extrapolating Errors from Small Models (2023.findings-emnlp)

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Challenge: *Data Synthesis* is a promising way to train a small model with very little labeled data.
Approach: They propose a framework that iteratively extrapolates the errors of a small model trained on a real-world validation dataset using a large language model.
Outcome: The proposed framework reduces the gap between the synthesized dataset and the real data . it improves on multiple NLP tasks and on large models with human-annotated data.

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