Ray architecture

Ray architecture:

flowchart TD
    %% Top Layer: User and High-Level APIs
    A["User Application"]
    subgraph "High-Level AI Libraries"
        PA["Python API and High‑Level Extensions (AI libraries)"]:::ai
        RL["RLlib (Reinforcement Learning Library)"]:::ai
    end

    %% Middle Layer: Ray Core Runtime
    subgraph "Ray Core Runtime"
        subgraph "Head Node"
            GCS["Global Control Store (GCS)"]:::core
            RH["Raylet (Node Manager)"]:::core
            RPC["RPC/Communication Infrastructure"]:::core
        end
        subgraph "Worker Node"
            RW["Raylet (Node Manager)"]:::core
            CW["Core Worker"]:::core
            OS["Object Store"]:::core
        end
    end

    %% Bottom Layer: External Integrations and Tools
    subgraph "External Integrations"
        RD["Ray Dashboard"]:::external
        BC["Build and Configuration Files"]:::external
    end

    %% Connections from Top Layer to Core Runtime
    A -->|"submits tasks"| PA
    PA -->|"invokes tasks"| CW
    PA -->|"triggers RL workflows"| RL

    %% Within Core Runtime - Head Node interactions
    GCS -->|"schedules tasks"| RH
    RH -->|"communicates via RPC"| RPC
    RPC -->|"coordinated with"| GCS

    %% Within Core Runtime - Worker Node interactions
    RW -->|"allocates resources"| CW
    CW -->|"stores results in"| OS

    %% Inter-node communications
    RH -->|"management commands"| RW
    GCS -->|"global state"| RW

    %% External Integrations connections
    RD <-->|"monitors"| GCS
    RD <-->|"monitors"| RH
    RD <-->|"monitors"| RW
    BC -->|"builds and tests"| PA
    BC -->|"builds and tests"| GCS

    %% Click Events
    click GCS "https://github.com/bobbercheng/ray/tree/master/src/ray/gcs"
    click RH "https://github.com/bobbercheng/ray/tree/master/src/ray/raylet"
    click RW "https://github.com/bobbercheng/ray/tree/master/src/ray/raylet"
    click CW "https://github.com/bobbercheng/ray/tree/master/src/ray/core_worker"
    click OS "https://github.com/bobbercheng/ray/tree/master/src/ray/object_manager/plasma"
    click RPC "https://github.com/bobbercheng/ray/tree/master/src/ray/rpc"
    click PA "https://github.com/bobbercheng/ray/tree/master/python/ray"
    click RL "https://github.com/bobbercheng/ray/tree/master/rllib"
    click RD "https://github.com/bobbercheng/ray/tree/master/python/ray/dashboard"
    click BC "https://github.com/bobbercheng/ray/tree/master/Bazel-related files (e.g., .bazelrc, BUILD.bazel, WORKSPACE, and bazel/)"

    %% Class definitions for colors
    classDef core fill:#ADD8E6,stroke:#000,stroke-width:1px;
    classDef ai fill:#90EE90,stroke:#000,stroke-width:1px;
    classDef external fill:#FFD700,stroke:#000,stroke-width:1px;