Document dynamo (#146736)

Summary:
Many files in dynamo are currently lacking file/module-level documentation, which makes it hard to know what they do at a glance and without digging into the code. This fixes that.

Note: documentation was AI-generated and could be incorrect, please review carefully.

X-link: pytorch/pytorch#146736
Approved by: https://github.com/jansel, https://github.com/StrongerXi, https://github.com/anijain2305, https://github.com/zou3519

Reviewed By: huydhn

Differential Revision: D69565828

fbshipit-source-id: 093b4575224b914a263f3e8e8994a63015a5b66d

Author: Raymo111

userbenchmark/dynamo/dynamobench/_dynamo/testing.py

@@ -1,3 +1,18 @@
+"""Testing utilities and infrastructure for Dynamo.
+
+This module provides a comprehensive set of testing utilities including:
+- Test result collection and validation
+- Graph manipulation and comparison tools
+- Test case management and execution helpers
+- Specialized test decorators for different Python versions and features
+- RNG state management
+- Compilation counting and monitoring
+- Debug utilities for bytecode transformation
+
+The utilities in this module are used across Dynamo's test suite to ensure
+consistent testing patterns and proper test isolation.
+"""
+
 import contextlib
 import dis
 import functools

userbenchmark/dynamo/dynamobench/_dynamo/utils.py

@@ -1,4 +1,19 @@
 # mypy: allow-untyped-defs
+
+"""
+Utility functions and classes used throughout the TorchDynamo system.
+
+This module contains a collection of helper utilities used by various parts of Dynamo for:
+- Performance metrics collection and reporting
+- Compilation timing and debugging
+- Graph manipulation and tensor operations
+- Runtime guards and checks
+- Common data structure operations
+- Testing and development tools
+
+This is an internal module that provides shared functionality used across the Dynamo codebase.
+"""
+
 from __future__ import annotations
 
 import atexit