We offer an overview of Adversary Generative Networks (GAN), a type of machine learning algorithm that uses an adversarial learning framework with two submodules: a generator and a discriminator. The fundamental concept of GANs is explained with an analogy of a counterfeiter and the police, and generative modeling is deepened, highlighting the problem of intractable normalization constants and how GANs address it. It also examines the loss function used to train GANs, its relationship with zero-sum or minimax play, and common training problems, such as mode collapse and gradients that fade. In addition, the adversarial nature of GANs is described and their uses in image generation, video frame prediction and image improvement are highlighted.

The source material, an excerpt from a transcript of the IBM Technology video titled "What is Retrieval-Augmented Generation (RAG)?," explains a framework designed to enhance the accuracy and timeliness of large language models (LLMs). Marina Danilevsky, a research scientist at IBM Research, describes how LLMs often face challenges such as providing outdated information or lacking sources for their responses, which can lead to incorrect answers or hallucinations. The RAG framework addresses these issues by integrating a content repository that the LLM accesses first to retrieve relevant information in response to a user query. This retrieval-augmented process ensures that the model generates responses based on up-to-date data and can provide evidence to support its claims.

An overview of word embeddings, explaining that they are numerical representations of words—often in the form of vectors—that capture their semantic and contextual relationships. The need to transform raw text into numbers arises from the inability of most machine learning algorithms to process plain text, making word embeddings a fundamental tool in natural language processing (NLP). The video describes various applications of embeddings, including text classification and named entity recognition (NER), as well as the process of creating them through models trained on large text corpora. Finally, the text contrasts the two main approaches: frequency-based embeddings (such as TF-IDF) and prediction-based embeddings (such as Word2vec and GloVe), concluding with the advancement toward contextual embeddings offered by Transformer models.