/**
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* @license
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* Copyright 2019 Google LLC
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*
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* Use of this source code is governed by an MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT.
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* =============================================================================
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*/
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/// <amd-module name="@tensorflow/tfjs-layers/dist/user_defined_metadata" />
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/** Utility functions related to user-defined metadata. */
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export declare const MAX_USER_DEFINED_METADATA_SERIALIZED_LENGTH: number;
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/**
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* Check validity of user-defined metadata.
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*
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* @param userDefinedMetadata
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* @param modelName Name of the model that the user-defined metadata belongs to.
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* Used during construction of error messages.
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* @param checkSize Whether to check the size of the metadata is under
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* recommended limit. Default: `false`. If `true`, will try stringify the
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* JSON object and print a console warning if the serialzied size is above the
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* limit.
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* @throws Error if `userDefinedMetadata` is not a plain JSON object.
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*/
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export declare function checkUserDefinedMetadata(userDefinedMetadata: {}, modelName: string, checkSize?: boolean): void;
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/**
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* Check if an input is plain JSON object or any valid subfield of it.
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*
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* @param x The input to be checked.
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* @param assertObject Whether to assert `x` is a JSON object, i.e., reject
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* cases of arrays and primitives.
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* @return Returns `true` if and only if `x` is a plain JSON object,
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* a JSON-valid primitive including string, number, boolean and null,
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* or an array of the said types.
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*/
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export declare function plainObjectCheck(x: any): boolean;
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