· Xiaojing Yang · NLP and LLMs
Fine-Tuning Transformers
How pretrained language models are adapted to a task or domain with supervised data.
Blog
Foundations and research notes on mathematics, statistics, machine learning, NLP, LLMs, model evaluation, and applied AI systems.
- · Xiaojing Yang · Machine Learning
Grid Search and Randomized Search
How to tune hyperparameters without confusing search effort with scientific evidence.
- · Xiaojing Yang · Statistics
Hypothesis Testing Without Rituals
Hypothesis testing is a way to discipline claims, not a ritual for producing p-values.
- · Xiaojing Yang · Statistics
Linear Regression as a Statistical Model
Linear regression is more than a line: it is a model of signal, noise, assumptions, and explanation.
- · Xiaojing Yang · NLP and LLMs
LLM Evaluation and Failure Modes
A practical map of LLM evaluation risks: hallucination, prompt sensitivity, bias, contamination, and brittle benchmarks.
- · Xiaojing Yang · Statistics
MAP Estimation and Bayesian Thinking
MAP estimation shows how prior beliefs and observed evidence combine.