what are Transformer, LLM , and GPT

In the field of AI and Natural Language Processing (NLP), The Transformer is the engine or the core part of the technique utilizing self-attention, Large Language Models (LLMs) are the entire category of models using that technique, and GPT is a specific type of models (e.g. language translation) built using Transformers.
Here is a direct breakdown of how they connect and what each one does.

1. Transformer: The Engine or the core part of the model

Introduced by Google researchers in a famous 2017 paper titled “Attention Is All You Need,” the Transformer is a revolutionary blueprint or neural network architecture for processing data. Before transformers, AI read text word-by-word, often losing track of the beginning of a sentence by the time it reached the end.
Self-Attention: This is the transformer’s core innovation. It allows the model to look at every word in a sentence simultaneously and figure out how they relate to one another, no matter how far apart they are. For example, in the sentence “The bank of the river was muddy,” the transformer uses context clues to instantly know “bank” means land, not a financial institution.
Parallel Processing: Because it processes entire blocks of text all at once instead of sequentially, it can be trained incredibly fast on massive amounts of data.

2. LLM: The General Class of models using Transformers

A Large Language Model (LLM) is a broad classification for any AI model designed to understand, summarize, translate, and generate human language using billions of internal settings called “parameters.”
The Umbrella Term: LLM is a job description, not a specific product. Any AI that is trained on a massive mountain of text to predict the next word or token is an LLM.
Not All LLMs Are GPTs: While almost all modern LLMs use the Transformer architecture, they come from different companies and have different designs. Examples of LLMs include Google’s Gemini, Meta’s Llama, Anthropic’s Claude, and OpenAI’s GPT series.

3. GPT: The Specific Implementation, e.g. language translation

Created by OpenAI, GPT stands for Generative Pre-trained Transformer. It is a specific, highly successful family of LLMs built using the transformer blueprint.