Week 4 of 12

Numbers that move: NumPy and vectorized thinking

Internalize broadcasting, indexing, matrix ops at CS231n day-one bar.

What you ship by Sunday

Public Colab notebook numpy-from-zero.ipynb with 20 vectorized exercises (no for-loops), reproducing a small MNIST load and a forward matmul, committed to GitHub with rendered output.

This week is a coach-off micro-checkpoint.

Reproduce the prior week artifact from a blank file. No copy-pasting, no AI assist, no opening last week's repo. The coach is unavailable on this page. The point is to prove the muscle memory is in your hands, not in the chat window.