src/llms/tasks.qmd

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title: NLP Tasks
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Large language models (LLMs) such as GPT, BERT, LLama, Gemma, Phi and others have demonstrated impressive capabilities across a broad spectrum of natural language processing (NLP) tasks. These models are trained on vast datasets and can perform multiple tasks with a high degree of proficiency. Their flexibility allows them to be used for everything from writing assistance and translation to complex question answering systems.

However, while LLMs are versatile, they are not always the most compute-efficient solution for every specific NLP task. These models can be resource-intensive, requiring significant computational power and memory, which may not be practical for all applications, especially those with limited resources or those requiring real-time performance.

For tasks that have very specific requirements or constraints, building a tailored model or fine-tuning an existing model on a specialized dataset can be much more efficient. Such models are often smaller and faster, reducing computational costs and improving responsiveness without sacrificing performance. They can also be optimized to better handle the nuances of the particular task or domain, potentially yielding better results than a general-purpose LLM.

Therefore, while LLMs offer a powerful one-size-fits-all solution, there are many scenarios where a customized approach could provide significant benefits.

In light of these considerations, it is crucial for you to identify the specific NLP task that best aligns with their needs. Below is a list of common NLP tasks performed by AI models. By understanding the distinctive requirements and capabilities of each task, you can more effectively choose or design a model that optimally supports your objectives as you continue your journey in leveraging AI technology.

* [Andrew NG : Sequence Models Complete Course](https://www.youtube.com/watch?v=S7oA5C43Rbc)


### 1. **Feature Extraction**
Feature extraction in NLP involves identifying and isolating useful information from raw data (such as text) that models can process to perform tasks like classification or clustering. This could involve extracting specific words, phrases, sentiment scores, or syntactic patterns which serve as inputs for more complex algorithms.

### 2. **Fill-Mask**
Fill-mask is a common task used to train and test language models. It involves presenting a sentence with one or more words missing (masked), and the model's task is to predict the correct words to fill these gaps. This task helps in assessing and improving a model's understanding of language context and structure.

### 3. **Question Answering**
Question answering (QA) involves designing models that can understand and respond to questions posed in natural language. This task is essential for applications like virtual assistants, customer support bots, and information retrieval systems. QA can be open-domain (broad and general knowledge) or closed-domain (restricted to specific contexts or datasets).

### 4. **Sentence Similarity**
Sentence similarity measures how closely related two pieces of text are in terms of meaning. This task is crucial for applications such as paraphrase detection, information retrieval, and text clustering. Models evaluate similarity based on various linguistic features and contextual embeddings.

### 5. **Summarization**
Summarization involves creating a concise and coherent summary of a longer text document. AI models for summarization can generate both extractive summaries (selecting key phrases or sentences from the original text) and abstractive summaries (paraphrasing and condensing the text into new formulations).

### 6. **Table Question Answering**
Table question answering is a specialized form of QA where the model interprets and answers questions based on structured data presented in tables. This requires understanding of both natural language and the ability to navigate and interpret tabular data formats effectively.

### 7. **Text Classification**
Text classification involves categorizing text into predefined categories. This can be used for tasks such as sentiment analysis, topic labeling, and spam detection. Models are trained on labeled datasets to learn how to classify new, unseen texts.

### 8. **Text Generation**
Text generation is the task of automatically producing text that is coherent, contextually relevant, and grammatically correct. This capability underlies applications like chatbots, content creation tools, and interactive storytelling systems. Models like GPT (Generative Pre-trained Transformer) excel in this area.

### 9. **Token Classification**
Token classification involves labeling individual words or phrases within a text according to their grammatical roles or other attributes, such as named entity recognition (NER) or part-of-speech (POS) tagging. This task is foundational for many NLP applications that require detailed linguistic analysis.

### 10. **Translation**
Translation involves converting text from one language to another while retaining the original meaning, tone, and context. AI-driven machine translation has become highly sophisticated, with models like those from Google and OpenAI offering near real-time translation capabilities across many languages.

### 11. **Zero-Shot Classification**
Zero-shot classification refers to the ability of a model to correctly classify data into categories it has not explicitly been trained on. This is achieved by understanding the general concept of a category from other tasks and applying this understanding to new, unseen categories.

Each of these tasks showcases the versatility and depth of AI's applications in NLP, demonstrating how LLMs and other models can process, understand, and generate human language in ways that are increasingly sophisticated and useful across various domains.