uv sync does not install the ecg_byte extension required for preprocessing

[Shehz]

Description

uv run src/main.py --base ptb_xl fails with ModuleNotFoundError: No module named 'ecg_byte' after following installation instructions

Steps to Reproduce

1. if git clone and uv installed, just cd into the repo and uv sync.
2. uv run src/main.py --base ptb_xl or sh scripts/prepare_base.sh

Observed Behavior

ELM-Research/ECG-Preprocess/src/ecg_tokenizer/build_ecg_tokenizer.py", line 12, in <module> import ecg_byte ModuleNotFoundError: No module named 'ecg_byte'

Investigation

While investigating the issue, I found that:

1. src/ecg_tokenizer/build_ecg_tokenizer.py imports ecg_byte.
2. ecg_byte is implemented as a PyO3 Rust extension (src/ecg_tokenizer/ecg_byte/Cargo.toml).
3. pyproject.toml includes maturin as a dependency, but I could not find a documented or automated step that builds/installs the Rust extension during the project setup.

Possible Solutions

1. Build and install the ecg_byte PyO3 extension as part of the project setup.
2. If a manual build step is intended, document it in the README before instructing users to run uv run src/main.py.