Skill

mcore-linting-and-formatting

Name: mcore-linting-and-formatting
Author: NVIDIA

lint and format Megatron-LM code

Published by NVIDIA Updated Jul 14

Covers Best Practices Code Analysis

Description

Linting and formatting for Megatron-LM. Covers running autoformat.sh, tools (ruff, black, isort, pylint, mypy), and code style rules.

SKILL.md

Linting and Formatting

Running the Formatter

Run before opening a PR:

# Check mode (no changes applied)
BASE_REF=main CHECK_ONLY=true SKIP_DOCS=false bash tools/autoformat.sh

# Fix mode
BASE_REF=main CHECK_ONLY=false bash tools/autoformat.sh

Tools invoked: black, isort, pylint, ruff, mypy.

Import Ordering

After editing imports in any Python files, always run uv run isort on those files before committing:

uv run isort <file1>.py <file2>.py

Setting Up the Linting Group

Inside the container:

uv sync --locked --only-group linting

This installs ruff, black, isort, pylint — the same tools used by tools/autoformat.sh and CI's linting job.

Code Style Rules

Type hints: required on all public API functions. Use X | None, not Optional[X].
Docstrings: Google-style on all public classes and functions.
Naming: follow Python conventions — snake_case for functions and variables, PascalCase for classes.
Line length: 119 characters (configured in pyproject.toml).
No bare except: always catch specific exception types.

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