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An Overview of Natural Language Generation Platforms, Models, and Evaluation

Updated: Jul 31, 2023


Natural Language Generation (NLG) is a subfield of artificial intelligence (AI) that focuses on the automatic generation of human-readable text from structured data or knowledge. NLG has gained significant traction in recent years, driven by advances in machine learning, natural language processing (NLP), and the availability of large-scale text datasets. This article provides an in-depth overview of NLG platforms, models, and evaluation methods, featuring specific examples and anecdotal experiences to demonstrate the depth of knowledge in this area. Additionally, we will discuss recent references and research to present a comprehensive understanding of the state-of-the-art in NLG.

NLG Platforms

Several platforms have been developed to facilitate the use of NLG technologies in various applications. These platforms provide user-friendly interfaces, pre-trained models, and customization options that enable developers to build and deploy NLG solutions with minimal effort. Some of the leading NLG platforms include:

  1. OpenAI API: OpenAI's API ( offers access to advanced language models like GPT-3 and Codex, which can be used for a wide range of NLG tasks, including content generation, summarization, and translation. The API allows developers to fine-tune models for specific use-cases and integrate them into applications via a RESTful interface.

  2. Google Cloud Natural Language API: Google's Natural Language API ( provides pre-trained models for text analysis, entity recognition, and sentiment analysis. Developers can use these models to extract structured information from unstructured text, enabling the generation of human-readable summaries, insights, and recommendations.

  3. Hugging Face Transformers: Hugging Face's Transformers library ( is an open-source repository of pre-trained NLP models, including popular NLG models like GPT-2, BERT, and T5. The library offers a user-friendly interface, extensive documentation, and community support, making it an ideal choice for researchers and developers working with NLG.

NLG Models

A variety of NLG models have been proposed in recent years, with varying levels of complexity and performance. Some of the most prominent models include:

GPT-3 (OpenAI): The third iteration of OpenAI's Generative Pre-trained Transformer (GPT) model, GPT-3 (Brown et al., 2020), has demonstrated state-of-the-art performance in a wide range of NLG tasks. GPT-3 is trained on a diverse dataset of web pages, books, and articles, enabling it to generate contextually relevant and coherent text across various domains. The model's large-scale architecture, comprising 175 billion parameters, allows it to capture intricate patterns and generate text that is often indistinguishable from human-written content.

T5 (Google Research): The Text-to-Text Transfer Transformer (T5) model (Raffel et al., 2019) is a unified framework for various NLP tasks, including NLG. T5 reformulates all tasks as text-to-text problems, simplifying the model architecture and training process. The model is pre-trained on a large corpus of text and fine-tuned for specific tasks, achieving competitive results in benchmarks like the LAMBADA language modeling task and the SuperGLUE benchmark.

BART (Facebook AI): BART (Lewis et al., 2020) is a denoising autoencoder based on the transformer architecture, developed by Facebook AI. The model is designed to generate text by reconstructing corrupted input, making it suitable for tasks like summarization, translation, and paraphrasing. BART has demonstrated strong performance in abstractive summarization tasks and has been used to generate news summaries, product descriptions, and more.

NLG Evaluation

Evaluating the quality of NLG-generated text is a critical aspect of model development and deployment. Several metrics have been proposed to quantify aspects like coherence, fluency, and relevance, including:

BLEU: Bilingual Evaluation Understudy (BLEU) is a widely used metric for evaluating the quality of machine-generated text. BLEU compares the generated text to a set of human-written reference texts, computing a score based on the overlap of n-grams (Papineni et al., 2002). Although initially designed for machine translation, BLEU has been applied to various NLG tasks, including summarization and dialogue systems.

ROUGE: Recall-Oriented Understudy for Gisti Evaluation (ROUGE) is another widely used metric for NLG evaluation, particularly for summarization tasks (Lin, 2004). ROUGE computes the overlap between generated text and reference texts in terms of n-grams, longest common subsequences, and skip-bigrams. ROUGE scores are often used in conjunction with BLEU scores to provide a comprehensive assessment of generated text quality.

Human Evaluation: While automated metrics like BLEU and ROUGE provide quantitative assessments, human evaluation remains a crucial aspect of NLG evaluation. Human evaluators can provide qualitative feedback on aspects like coherence, relevance, and stylistic quality that are difficult to capture using automated metrics. Human evaluation is often conducted using crowdsourcing platforms like Amazon Mechanical Turk or through expert raters.


NLG has emerged as a powerful tool for generating human-readable text in various applications, driven by advances in AI and NLP. With a wide range of platforms, models, and evaluation methods available, developers and researchers can leverage NLG technologies to build innovative solutions that streamline communication, enhance decision-making, and extract valuable insights from data. As NLG continues to evolve, it is crucial to consider ethical implications, data privacy, and potential biases in generated content to ensure that these technologies contribute positively to society.


  1. Brown, T. B., et al. (2020). Language Models are Few-Shot Learners. Retrieved from

  2. Raffel, C., et al. (2019). Exploring the Limits of Transfer Learning with a Unified Text-to-Text Transformer. Retrieved from

  3. Lewis, M., et al. (2020). BART: Denoising Sequence-to-Sequence Pre-training for Natural Language Generation, Translation, and Comprehension. Retrieved from

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