Change Log

Personal site update log (not to be confused with CHANGELOG.md, which tracks the upstream Minimal Mistakes theme).

2026-08-11

• Added new post: “Mastering the Adam Optimizer: From Concept to NumPy & PyTorch Implementation” (_posts/2026-08-11-Adam_Optimizer_From_Scratch_NumPy_vs_PyTorch.md)
  • Covers the Adam algorithm (first/second moments, bias correction, epsilon), implemented from scratch in NumPy and again via torch.optim.Adam
  • Published from a standalone markdown draft (_md/adam-optimizer-en.md); draft folder removed after publishing
  • Companion notebook added afterward: notebooks/2026-08-11-Adam_Optimizer_From_Scratch_NumPy_vs_PyTorch.ipynb, executed with the ai_agent conda env (numpy 2.2.4, torch 2.7.1) so cell outputs are real, not transcribed

2026-08-10

• Added new post: “Implementing Gradient Descent From Scratch: NumPy vs PyTorch” (_posts/2026-08-10-Gradient_Descent_From_Scratch_NumPy_vs_PyTorch.md)
  • Covers linear regression gradient descent (manual gradient + autograd) and batch/stochastic/mini-batch variants, both in NumPy and PyTorch
  • Published directly from a standalone markdown draft (md/gradient_descent_blog_post.md); no companion notebook exists for this post
  • Removed the redundant top-level # heading duplicating the frontmatter title — adopted as the convention for new posts going forward (see 2026-08-11 post above, which follows it from the start)

2026-08-02

• Added new post: “Basic Neural Network from Scratch: NumPy vs PyTorch” (_posts/2026-08-02-Neural_Network_From_Scratch_with_NumPy_and_PyTorch.md)
  • Single-hidden-layer NN (2→6→1, tanh/sigmoid) trained on a non-linearly-separable XOR-pattern dataset
  • Forward/backward propagation implemented and executed both by hand in NumPy and via autograd in PyTorch
  • Companion notebook: notebooks/2026-08-02-Neural_Network_From_Scratch_with_NumPy_and_PyTorch.ipynb
  • Generated plots stored under assets/images/NN_Scratch/
• Added MathJax to _includes/head/custom.html so kramdown-rendered math ($$...$$ block, $...$ inline) displays site-wide
  • Initial config only registered \(...\) as an inline delimiter; fixed to also register $...$, since kramdown leaves inline math in that form untouched
• Translated the new post/notebook’s explanatory text and code comments from Korean to English (content and generated outputs unchanged)
• Added PROJECT_NOTES.md documenting the repo’s directory structure and posting workflow