large-class-style

Keep the class as a thin composition root that only constructs, wires, delegates, and coordinates collaborators. Move domain logic — config building, data transformation, algorithms — into collaborator classes in their own modules, and expose small init_<thing> helpers for construction.

The style guide designates python/sglang/srt/model_executor/model_runner.py as a frozen file. The conventions overall apply to three classes: Scheduler, TokenizerManager, and ModelRunner, with frozen files restricted to construct, wire, delegate, and coordinate statements.

Split __init__ into one init_<thing> helper per overridable concern, using maybe_init_<thing> for conditional construction. __init__ itself should only sequence these calls, so downstream forks override a single helper instead of copying the whole constructor.

No — pass narrow keyword arguments with only the specific values the collaborator needs, and return a small frozen struct for the orchestrator to assign. If the live object is genuinely required, keep it read-only in the callee and confine that dependency to the smallest leaf.

Only minimal coordination that cannot be cohesively extracted may remain — an if selecting which collaborator to call, ordering of calls, or threading one result into the next. It must stay pseudocode-readable, and you should note why it stays; if it outgrows that, extract a dedicated coordinator.