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import { dlopen, FetchOptions } from "../../deps.ts";import { CPUBackend } from "./backend.ts";import { NoBackendError } from "../core/api/error.ts";import { BackendLoader, Engine } from "../core/engine.ts";import { Backend, BackendType, Cost, NetworkConfig } from "../core/types.ts";import { Sequential } from "../core/mod.ts";
const options: FetchOptions = {  name: "netsaur",  url: new URL(import.meta.url).protocol !== "file:"    ? new URL(      "https://github.com/denosaurs/netsaur/releases/download/0.2.8/",      import.meta.url,    )    : "./target/release/",  cache: "reloadAll",};
const symbols = {  ffi_backend_create: {    parameters: ["buffer", "usize", "pointer"],    result: "usize",  } as const,  ffi_backend_train: {    parameters: ["usize", "buffer", "usize", "buffer", "usize"],    result: "void",  } as const,  ffi_backend_predict: {    parameters: ["usize", "buffer", "buffer", "usize", "buffer"],    result: "void",  } as const,  ffi_backend_save: {    parameters: ["usize", "pointer"],    result: "void",  } as const,  ffi_backend_load: {    parameters: ["buffer", "usize", "pointer"],    result: "usize",  } as const,};
export type Library = Deno.DynamicLibrary<typeof symbols>;
export class CPUInstance {  static library?: Library;  static initialized = false;
  static async init(silent = false) {    if (CPUInstance.initialized) return true;
    CPUInstance.library = await dlopen(options, symbols);    CPUInstance.initialized = true;    if (!silent) console.log("CPU Backend Initialised");    return true;  }}
export class CPUBackendLoader implements BackendLoader {  backend?: CPUBackend;
  async setup(silent = false) {    Engine.type = BackendType.CPU;    return await CPUInstance.init(silent);  }
  loadBackend(config: NetworkConfig): Backend {    if (!CPUInstance.initialized) {      throw new NoBackendError(BackendType.CPU);    }    return this.backend      ? this.backend      : CPUBackend.create(config, CPUInstance.library!);  }
  load(buffer: Uint8Array): Sequential {    this.backend = CPUBackend.load(buffer, CPUInstance.library!);    const net = new Sequential({ size: [0], layers: [], cost: Cost.MSE });    this.backend = undefined;    return net;  }
  loadFile(path: string): Sequential {    this.backend = CPUBackend.loadFile(path, CPUInstance.library!);    const net = new Sequential({ size: [0], layers: [], cost: Cost.MSE });    this.backend = undefined;    return net;  }}
/** * CPU Backend written in Rust. */export const CPU = new CPUBackendLoader();