/**
 * @license
 * Copyright 2021 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
/** Default TFJS backend. */
export declare const DEFAULT_TFJS_BACKEND: TFJSBackend;
/** Default TFJS version. */
export declare const DEFAULT_TFJS_VERSION = "3.6.0";
/**
 * Type of TFJS bckends.
 *
 * @docinline
 */
export declare type TFJSBackend = 'cpu' | 'webgl' | 'wasm';
/** Common loading options for TFJS models. */
export interface TFJSModelCommonLoadingOption {
    /** The backend to use to run TFJS models. Default to 'webgl'. */
    backend: TFJSBackend;
}
/** Common loading options for custom TFLite models. */
export interface TFLiteCustomModelCommonLoadingOption {
    /**
     * The model url, or the model content stored in an `ArrayBuffer`.
     *
     * You can use TFLite model urls from `tfhub.dev` directly. For model
     * compatibility, see comments in the corresponding model class.
     */
    model: string | ArrayBuffer;
}
/** All supported tasks. */
export declare enum Task {
    IMAGE_CLASSIFICATION = "IMAGE_CLASSIFICATION",
    OBJECT_DETECTION = "OBJECT_DETECTION",
    IMAGE_SEGMENTATION = "IMAGE_SEGMENTATION",
    SENTIMENT_DETECTION = "SENTIMENT_DETECTION",
    NL_CLASSIFICATION = "NL_CLASSIFICATION",
    QUESTION_AND_ANSWER = "QUESTION_AND_ANSWER"
}
/** All supported runtimes. */
export declare enum Runtime {
    TFJS = "TFJS",
    TFLITE = "TFLite",
    MEDIA_PIPE = "MediaPipe"
}
/** A single class in the classification result. */
export interface Class {
    /** The name of the class. */
    className: string;
    /** The score of the class. */
    score: number;
}
/** A helper function to get the TFJS packages that a TFJS model depends on. */
export declare function getTFJSModelDependencyPackages(backend?: TFJSBackend, version?: string): Array<string[]>;
/**
 * Makes sure the current tfjs backend matches the one in the given option.
 *
 * For TFJS models, this function should be called at the loading time as well
 * as before running inference.
 *
 * Users might run multiple TFJS models with different backend options in a web
 * app. Only setting the backend at the model loading time is not enough because
 * the backend might be set to another one when loading a different model. We
 * also need to call this right before running the inference.
 */
export declare function ensureTFJSBackend(options?: TFJSModelCommonLoadingOption): Promise<void>;