@tensorflow/tfjs-layers
Version:
TensorFlow layers API in JavaScript
517 lines • 56.9 kB
JavaScript
/**
* @license
* Copyright 2018 Google LLC
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
* =============================================================================
*/
/* Original source: utils/generic_utils.py */
import { util } from '@tensorflow/tfjs-core';
import { AssertionError, ValueError } from '../errors';
// tslint:enable
/**
* If `value` is an Array, equivalent to Python's `value * numValues`.
* If `value` is not an Array, equivalent to Python's `[value] * numValues`
*/
// tslint:disable-next-line:no-any
export function pyListRepeat(value, numValues) {
if (Array.isArray(value)) {
// tslint:disable-next-line:no-any
let newArray = [];
for (let i = 0; i < numValues; i++) {
newArray = newArray.concat(value);
}
return newArray;
}
else {
const newArray = new Array(numValues);
newArray.fill(value);
return newArray;
}
}
export function assert(val, message) {
if (!val) {
throw new AssertionError(message);
}
}
/**
* Count the number of elements of the `array` that are equal to `reference`.
*/
export function count(array, refernce) {
let counter = 0;
for (const item of array) {
if (item === refernce) {
counter++;
}
}
return counter;
}
/**
* If an array is of length 1, just return the first element. Otherwise, return
* the full array.
* @param tensors
*/
export function singletonOrArray(xs) {
if (xs.length === 1) {
return xs[0];
}
return xs;
}
/**
* Normalizes a list/tensor into a list.
*
* If a tensor is passed, we return
* a list of size 1 containing the tensor.
*
* @param x target object to be normalized.
*/
// tslint:disable-next-line:no-any
export function toList(x) {
if (Array.isArray(x)) {
return x;
}
return [x];
}
/**
* Generate a UID for a list
*/
// tslint:disable-next-line:no-any
export function objectListUid(objs) {
const objectList = toList(objs);
let retVal = '';
for (const obj of objectList) {
if (obj.id == null) {
throw new ValueError(`Object ${obj} passed to objectListUid without an id`);
}
if (retVal !== '') {
retVal = retVal + ', ';
}
retVal = `${retVal}${Math.abs(obj.id)}`;
}
return retVal;
}
/**
* Converts string to snake-case.
* @param name
*/
export function toSnakeCase(name) {
const intermediate = name.replace(/(.)([A-Z][a-z0-9]+)/g, '$1_$2');
const insecure = intermediate.replace(/([a-z])([A-Z])/g, '$1_$2').toLowerCase();
/*
If the class is private the name starts with "_" which is not secure
for creating scopes. We prefix the name with "private" in this case.
*/
if (insecure[0] !== '_') {
return insecure;
}
return 'private' + insecure;
}
export function toCamelCase(identifier) {
// quick return for empty string or single character strings
if (identifier.length <= 1) {
return identifier;
}
// Check for the underscore indicating snake_case
if (identifier.indexOf('_') === -1) {
return identifier;
}
return identifier.replace(/[_]+(\w|$)/g, (m, p1) => p1.toUpperCase());
}
// tslint:disable-next-line:no-any
let _GLOBAL_CUSTOM_OBJECTS = {};
export function serializeKerasObject(instance) {
if (instance === null || instance === undefined) {
return null;
}
const dict = {};
dict['className'] = instance.getClassName();
dict['config'] = instance.getConfig();
return dict;
}
/**
* Replace ndarray-style scalar objects in serialization objects with numbers.
*
* Background: In some versions of tf.keras, certain scalar values in the HDF5
* model save file can be serialized as: `{'type': 'ndarray', 'value': num}`,
* where in `num` is a plain number. This method converts such serialization
* to a `number`.
*
* @param config The keras-format serialization object to be processed
* (in place).
*/
function convertNDArrayScalarsInConfig(config) {
if (config == null || typeof config !== 'object') {
return;
}
else if (Array.isArray(config)) {
config.forEach(configItem => convertNDArrayScalarsInConfig(configItem));
}
else {
const fields = Object.keys(config);
for (const field of fields) {
const value = config[field];
if (value != null && typeof value === 'object') {
if (!Array.isArray(value) && value['type'] === 'ndarray' &&
typeof value['value'] === 'number') {
config[field] = value['value'];
}
else {
convertNDArrayScalarsInConfig(value);
}
}
}
}
}
/**
* Deserialize a saved Keras Object
* @param identifier either a string ID or a saved Keras dictionary
* @param moduleObjects a list of Python class names to object constructors
* @param customObjects a list of Python class names to object constructors
* @param printableModuleName debug text for the object being reconstituted
* @param fastWeightInit Optional flag to use fast weight initialization
* during deserialization. This is applicable to cases in which
* the initialization will be immediately overwritten by loaded weight
* values. Default: `false`.
* @returns a TensorFlow.js Layers object
*/
// tslint:disable:no-any
export function deserializeKerasObject(identifier, moduleObjects = {}, customObjects = {}, printableModuleName = 'object', fastWeightInit = false) {
// tslint:enable
if (typeof identifier === 'string') {
const functionName = identifier;
let fn;
if (functionName in customObjects) {
fn = customObjects[functionName];
}
else if (functionName in _GLOBAL_CUSTOM_OBJECTS) {
fn = _GLOBAL_CUSTOM_OBJECTS[functionName];
}
else {
fn = moduleObjects[functionName];
if (fn == null) {
throw new ValueError(`Unknown ${printableModuleName}: ${identifier}. ` +
`This may be due to one of the following reasons:\n` +
`1. The ${printableModuleName} is defined in Python, in which ` +
`case it needs to be ported to TensorFlow.js or your JavaScript ` +
`code.\n` +
`2. The custom ${printableModuleName} is defined in JavaScript, ` +
`but is not registered properly with ` +
`tf.serialization.registerClass().`);
// TODO(cais): Add link to tutorial page on custom layers.
}
}
return fn;
}
else {
// In this case we are dealing with a Keras config dictionary.
const config = identifier;
if (config['className'] == null || config['config'] == null) {
throw new ValueError(`${printableModuleName}: Improper config format: ` +
`${JSON.stringify(config)}.\n` +
`'className' and 'config' must set.`);
}
const className = config['className'];
let cls, fromConfig;
if (className in customObjects) {
[cls, fromConfig] = customObjects[className];
}
else if (className in _GLOBAL_CUSTOM_OBJECTS) {
[cls, fromConfig] = _GLOBAL_CUSTOM_OBJECTS['className'];
}
else if (className in moduleObjects) {
[cls, fromConfig] = moduleObjects[className];
}
if (cls == null) {
throw new ValueError(`Unknown ${printableModuleName}: ${className}. ` +
`This may be due to one of the following reasons:\n` +
`1. The ${printableModuleName} is defined in Python, in which ` +
`case it needs to be ported to TensorFlow.js or your JavaScript ` +
`code.\n` +
`2. The custom ${printableModuleName} is defined in JavaScript, ` +
`but is not registered properly with ` +
`tf.serialization.registerClass().`);
// TODO(cais): Add link to tutorial page on custom layers.
}
if (fromConfig != null) {
// Porting notes: Instead of checking to see whether fromConfig accepts
// customObjects, we create a customObjects dictionary and tack it on to
// config['config'] as config['config'].customObjects. Objects can use it,
// if they want.
// tslint:disable-next-line:no-any
const customObjectsCombined = {};
for (const key of Object.keys(_GLOBAL_CUSTOM_OBJECTS)) {
customObjectsCombined[key] = _GLOBAL_CUSTOM_OBJECTS[key];
}
for (const key of Object.keys(customObjects)) {
customObjectsCombined[key] = customObjects[key];
}
// Add the customObjects to config
const nestedConfig = config['config'];
nestedConfig['customObjects'] = customObjectsCombined;
const backupCustomObjects = Object.assign({}, _GLOBAL_CUSTOM_OBJECTS);
for (const key of Object.keys(customObjects)) {
_GLOBAL_CUSTOM_OBJECTS[key] = customObjects[key];
}
convertNDArrayScalarsInConfig(config['config']);
const returnObj = fromConfig(cls, config['config'], customObjects, fastWeightInit);
_GLOBAL_CUSTOM_OBJECTS = Object.assign({}, backupCustomObjects);
return returnObj;
}
else {
// Then `cls` may be a function returning a class.
// In this case by convention `config` holds
// the kwargs of the function.
const backupCustomObjects = Object.assign({}, _GLOBAL_CUSTOM_OBJECTS);
for (const key of Object.keys(customObjects)) {
_GLOBAL_CUSTOM_OBJECTS[key] = customObjects[key];
}
// In python this is **config['config'], for tfjs-layers we require
// classes that use this fall-through construction method to take
// a config interface that mimics the expansion of named parameters.
const returnObj = new cls(config['config']);
_GLOBAL_CUSTOM_OBJECTS = Object.assign({}, backupCustomObjects);
return returnObj;
}
}
}
/**
* Compares two numbers for sorting.
* @param a
* @param b
*/
export function numberCompare(a, b) {
return (a < b) ? -1 : ((a > b) ? 1 : 0);
}
/**
* Comparison of two numbers for reverse sorting.
* @param a
* @param b
*/
export function reverseNumberCompare(a, b) {
return -1 * numberCompare(a, b);
}
/**
* Convert a string into the corresponding DType.
* @param dtype
* @returns An instance of DType.
*/
export function stringToDType(dtype) {
switch (dtype) {
case 'float32':
return 'float32';
default:
throw new ValueError(`Invalid dtype: ${dtype}`);
}
}
/**
* Test the element-by-element equality of two Arrays of strings.
* @param xs First array of strings.
* @param ys Second array of strings.
* @returns Wether the two arrays are all equal, element by element.
*/
export function stringsEqual(xs, ys) {
if (xs == null || ys == null) {
return xs === ys;
}
if (xs.length !== ys.length) {
return false;
}
for (let i = 0; i < xs.length; ++i) {
if (xs[i] !== ys[i]) {
return false;
}
}
return true;
}
/**
* Get the unique elements of an array.
* @param xs Array.
* @returns An Array consisting of the unique elements in `xs`.
*/
export function unique(xs) {
if (xs == null) {
return xs;
}
const out = [];
// TODO(cais): Maybe improve performance by sorting.
for (const x of xs) {
if (out.indexOf(x) === -1) {
out.push(x);
}
}
return out;
}
/**
* Determine if an Object is empty (i.e., does not have own properties).
* @param obj Object
* @returns Whether the Object is empty.
* @throws ValueError: If object is `null` or `undefined`.
*/
export function isObjectEmpty(obj) {
if (obj == null) {
throw new ValueError(`Invalid value in obj: ${JSON.stringify(obj)}`);
}
for (const key in obj) {
if (obj.hasOwnProperty(key)) {
return false;
}
}
return true;
}
/**
* Helper function used to build type union/enum run-time checkers.
* @param values The list of allowed values.
* @param label A string name for the type
* @param value The value to test.
* @throws ValueError: If the value is not in values nor `undefined`/`null`.
*/
export function checkStringTypeUnionValue(values, label, value) {
if (value == null) {
return;
}
if (values.indexOf(value) < 0) {
throw new ValueError(`${value} is not a valid ${label}. Valid values are ${values} or null/undefined.`);
}
}
/**
* Helper function for verifying the types of inputs.
*
* Ensures that the elements of `x` are all of type `expectedType`.
* Also verifies that the length of `x` is within bounds.
*
* @param x Object to test.
* @param expectedType The string expected type of all of the elements in the
* Array.
* @param minLength Return false if x.length is less than this.
* @param maxLength Return false if x.length is greater than this.
* @returns true if and only if `x` is an `Array<expectedType>` with
* length >= `minLength` and <= `maxLength`.
*/
// tslint:disable:no-any
export function checkArrayTypeAndLength(x, expectedType, minLength = 0, maxLength = Infinity) {
assert(minLength >= 0);
assert(maxLength >= minLength);
return (Array.isArray(x) && x.length >= minLength && x.length <= maxLength &&
x.every(e => typeof e === expectedType));
}
// tslint:enable:no-any
/**
* Assert that a value or an array of value are positive integer.
*
* @param value The value being asserted on. May be a single number or an array
* of numbers.
* @param name Name of the value, used to make the error message.
*/
export function assertPositiveInteger(value, name) {
if (Array.isArray(value)) {
util.assert(value.length > 0, () => `${name} is unexpectedly an empty array.`);
value.forEach((v, i) => assertPositiveInteger(v, `element ${i + 1} of ${name}`));
}
else {
util.assert(Number.isInteger(value) && value > 0, () => `Expected ${name} to be a positive integer, but got ` +
`${formatAsFriendlyString(value)}.`);
}
}
/**
* Format a value into a display-friendly, human-readable fashion.
*
* - `null` is formatted as `'null'`
* - Strings are formated with flanking pair of quotes.
* - Arrays are formatted with flanking pair of square brackets.
*
* @param value The value to display.
* @return Formatted string.
*/
// tslint:disable-next-line:no-any
export function formatAsFriendlyString(value) {
if (value === null) {
return 'null';
}
else if (Array.isArray(value)) {
return '[' + value.map(v => formatAsFriendlyString(v)).join(',') + ']';
}
else if (typeof value === 'string') {
return `"${value}"`;
}
else {
return `${value}`;
}
}
/**
* Returns a function `f2` (decorator) which wraps the original function
* `f`. `f2` guarantees that `f` can be called at most once
* every `waitMs` ms. If `f2` is called more often, it will return
* the last returned result of `f`.
*
* @param f The original function `f` to wrap.
* @param waitMs The time between two consecutive calls to `f` in ms.
*/
export function debounce(f, waitMs, nowFunc) {
let lastTime = nowFunc != null ? nowFunc() : util.now();
let lastResult;
const f2 = (...args) => {
const now = nowFunc != null ? nowFunc() : util.now();
if (now - lastTime < waitMs) {
return lastResult;
}
lastTime = now;
lastResult = f(...args);
return lastResult;
};
return f2;
}
/**
* Returns the fusable activation given a layers identifier.
*
* @param activationName The layers identifier string.
* @return The name of the fusable activation.
*/
export function mapActivationToFusedKernel(activationName) {
if (activationName === 'relu') {
return 'relu';
}
if (activationName === 'linear') {
return 'linear';
}
if (activationName === 'elu') {
return 'elu';
}
return null;
}
/**
* Returns the cartesian product of sets of values.
* This works the same as itertools.product in Python.
*
* Example:
*
* filters = [128, 256, 512]
* paddings = ['same', 'valid']
*
* product = [ [128, 'same'], [128, 'valid'], [256, 'same'], [256, 'valid'],
* [512, 'same'], [512, 'valid']]
*
* @param arrayOfValues List/array of values.
* @return The cartesian product.
*/
export function getCartesianProductOfValues(...arrayOfValues) {
assert(arrayOfValues.length > 0, 'arrayOfValues is empty');
for (const values of arrayOfValues) {
assert(Array.isArray(values), 'one of the values is not an array');
assert(values.length > 0, 'one of the values is empty');
}
return arrayOfValues.reduce((products, values) => {
if (products.length === 0) {
return values.map(value => [value]);
}
return values
.map(value => {
return products.map((prevValue) => [...prevValue, value]);
})
.reduce((flattenedProduct, unflattenedProduct) => {
return flattenedProduct.concat(unflattenedProduct);
}, []);
}, []);
}
//# 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newArray = new Array(numValues);\n    newArray.fill(value);\n    return newArray;\n  }\n}\n\nexport function assert(val: boolean, message?: string): void {\n  if (!val) {\n    throw new AssertionError(message);\n  }\n}\n\n/**\n * Count the number of elements of the `array` that are equal to `reference`.\n */\nexport function count<T>(array: T[], refernce: T) {\n  let counter = 0;\n  for (const item of array) {\n    if (item === refernce) {\n      counter++;\n    }\n  }\n  return counter;\n}\n\n/**\n * If an array is of length 1, just return the first element. 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We prefix the name with \"private\" in this case.\n   */\n  if (insecure[0] !== '_') {\n    return insecure;\n  }\n  return 'private' + insecure;\n}\n\nexport function toCamelCase(identifier: string): string {\n  // quick return for empty string or single character strings\n  if (identifier.length <= 1) {\n    return identifier;\n  }\n  // Check for the underscore indicating snake_case\n  if (identifier.indexOf('_') === -1) {\n    return identifier;\n  }\n  return identifier.replace(/[_]+(\\w|$)/g, (m, p1) => p1.toUpperCase());\n}\n\n// tslint:disable-next-line:no-any\nlet _GLOBAL_CUSTOM_OBJECTS = {} as {[objName: string]: any};\n\nexport function serializeKerasObject(instance: serialization.Serializable):\n    serialization.ConfigDictValue {\n  if (instance === null || instance === undefined) {\n    return null;\n  }\n  const dict: serialization.ConfigDictValue = {};\n  dict['className'] = instance.getClassName();\n  dict['config'] = instance.getConfig();\n  return dict;\n}\n\n/**\n * Replace ndarray-style scalar objects in serialization objects with numbers.\n *\n * Background: In some versions of tf.keras, certain scalar values in the HDF5\n * model save file can be serialized as: `{'type': 'ndarray', 'value': num}`,\n * where in `num` is a plain number. This method converts such serialization\n * to a `number`.\n *\n * @param config The keras-format serialization object to be processed\n *   (in place).\n */\nfunction convertNDArrayScalarsInConfig(config: serialization.ConfigDictValue):\n    void {\n  if (config == null || typeof config !== 'object') {\n    return;\n  } else if (Array.isArray(config)) {\n    config.forEach(configItem => convertNDArrayScalarsInConfig(configItem));\n  } else {\n    const fields = Object.keys(config);\n    for (const field of fields) {\n      const value = config[field];\n      if (value != null && typeof value === 'object') {\n        if (!Array.isArray(value) && value['type'] === 'ndarray' &&\n            typeof value['value'] === 'number') {\n          config[field] = value['value'];\n        } else {\n          convertNDArrayScalarsInConfig(value as serialization.ConfigDict);\n        }\n      }\n    }\n  }\n}\n\n/**\n * Deserialize a saved Keras Object\n * @param identifier either a string ID or a saved Keras dictionary\n * @param moduleObjects a list of Python class names to object constructors\n * @param customObjects a list of Python class names to object constructors\n * @param printableModuleName debug text for the object being reconstituted\n * @param fastWeightInit Optional flag to use fast weight initialization\n *   during deserialization. This is applicable to cases in which\n *   the initialization will be immediately overwritten by loaded weight\n *   values. Default: `false`.\n * @returns a TensorFlow.js Layers object\n */\n// tslint:disable:no-any\nexport function deserializeKerasObject(\n    identifier: string|serialization.ConfigDict,\n    moduleObjects = {} as {[objName: string]: any},\n    customObjects = {} as {[objName: string]: any},\n    printableModuleName = 'object', fastWeightInit = false): any {\n  // tslint:enable\n  if (typeof identifier === 'string') {\n    const functionName = identifier;\n    let fn;\n    if (functionName in customObjects) {\n      fn = customObjects[functionName];\n    } else if (functionName in _GLOBAL_CUSTOM_OBJECTS) {\n      fn = _GLOBAL_CUSTOM_OBJECTS[functionName];\n    } else {\n      fn = moduleObjects[functionName];\n      if (fn == null) {\n        throw new ValueError(\n            `Unknown ${printableModuleName}: ${identifier}. ` +\n            `This may be due to one of the following reasons:\\n` +\n            `1. The ${printableModuleName} is defined in Python, in which ` +\n            `case it needs to be ported to TensorFlow.js or your JavaScript ` +\n            `code.\\n` +\n            `2. The custom ${printableModuleName} is defined in JavaScript, ` +\n            `but is not registered properly with ` +\n            `tf.serialization.registerClass().`);\n        // TODO(cais): Add link to tutorial page on custom layers.\n      }\n    }\n    return fn;\n  } else {\n    // In this case we are dealing with a Keras config dictionary.\n    const config = identifier;\n    if (config['className'] == null || config['config'] == null) {\n      throw new ValueError(\n          `${printableModuleName}: Improper config format: ` +\n          `${JSON.stringify(config)}.\\n` +\n          `'className' and 'config' must set.`);\n    }\n    const className = config['className'] as string;\n    let cls, fromConfig;\n    if (className in customObjects) {\n      [cls, fromConfig] = customObjects[className];\n    } else if (className in _GLOBAL_CUSTOM_OBJECTS) {\n      [cls, fromConfig] = _GLOBAL_CUSTOM_OBJECTS['className'];\n    } else if (className in moduleObjects) {\n      [cls, fromConfig] = moduleObjects[className];\n    }\n    if (cls == null) {\n      throw new ValueError(\n          `Unknown ${printableModuleName}: ${className}. ` +\n          `This may be due to one of the following reasons:\\n` +\n          `1. The ${printableModuleName} is defined in Python, in which ` +\n          `case it needs to be ported to TensorFlow.js or your JavaScript ` +\n          `code.\\n` +\n          `2. The custom ${printableModuleName} is defined in JavaScript, ` +\n          `but is not registered properly with ` +\n          `tf.serialization.registerClass().`);\n      // TODO(cais): Add link to tutorial page on custom layers.\n    }\n    if (fromConfig != null) {\n      // Porting notes: Instead of checking to see whether fromConfig accepts\n      // customObjects, we create a customObjects dictionary and tack it on to\n      // config['config'] as config['config'].customObjects. Objects can use it,\n      // if they want.\n\n      // tslint:disable-next-line:no-any\n      const customObjectsCombined = {} as {[objName: string]: any};\n      for (const key of Object.keys(_GLOBAL_CUSTOM_OBJECTS)) {\n        customObjectsCombined[key] = _GLOBAL_CUSTOM_OBJECTS[key];\n      }\n      for (const key of Object.keys(customObjects)) {\n        customObjectsCombined[key] = customObjects[key];\n      }\n      // Add the customObjects to config\n      const nestedConfig = config['config'] as serialization.ConfigDict;\n      nestedConfig['customObjects'] = customObjectsCombined;\n\n      const backupCustomObjects = {..._GLOBAL_CUSTOM_OBJECTS};\n      for (const key of Object.keys(customObjects)) {\n        _GLOBAL_CUSTOM_OBJECTS[key] = customObjects[key];\n      }\n      convertNDArrayScalarsInConfig(config['config']);\n      const returnObj =\n          fromConfig(cls, config['config'], customObjects, fastWeightInit);\n      _GLOBAL_CUSTOM_OBJECTS = {...backupCustomObjects};\n\n      return returnObj;\n    } else {\n      // Then `cls` may be a function returning a class.\n      // In this case by convention `config` holds\n      // the kwargs of the function.\n      const backupCustomObjects = {..._GLOBAL_CUSTOM_OBJECTS};\n      for (const key of Object.keys(customObjects)) {\n        _GLOBAL_CUSTOM_OBJECTS[key] = customObjects[key];\n      }\n      // In python this is **config['config'], for tfjs-layers we require\n      // classes that use this fall-through construction method to take\n      // a config interface that mimics the expansion of named parameters.\n      const returnObj = new cls(config['config']);\n      _GLOBAL_CUSTOM_OBJECTS = {...backupCustomObjects};\n      return returnObj;\n    }\n  }\n}\n\n/**\n * Compares two numbers for sorting.\n * @param a\n * @param b\n */\nexport function numberCompare(a: number, b: number) {\n  return (a < b) ? -1 : ((a > b) ? 1 : 0);\n}\n\n/**\n * Comparison of two numbers for reverse sorting.\n * @param a\n * @param b\n */\nexport function reverseNumberCompare(a: number, b: number) {\n  return -1 * numberCompare(a, b);\n}\n\n/**\n * Convert a string into the corresponding DType.\n * @param dtype\n * @returns An instance of DType.\n */\nexport function stringToDType(dtype: string): DataType {\n  switch (dtype) {\n    case 'float32':\n      return 'float32';\n    default:\n      throw new ValueError(`Invalid dtype: ${dtype}`);\n  }\n}\n\n/**\n * Test the element-by-element equality of two Arrays of strings.\n * @param xs First array of strings.\n * @param ys Second array of strings.\n * @returns Wether the two arrays are all equal, element by element.\n */\nexport function stringsEqual(xs: string[], ys: string[]): boolean {\n  if (xs == null || ys == null) {\n    return xs === ys;\n  }\n  if (xs.length !== ys.length) {\n    return false;\n  }\n  for (let i = 0; i < xs.length; ++i) {\n    if (xs[i] !== ys[i]) {\n      return false;\n    }\n  }\n  return true;\n}\n\n/**\n * Get the unique elements of an array.\n * @param xs Array.\n * @returns An Array consisting of the unique elements in `xs`.\n */\nexport function unique<T>(xs: T[]): T[] {\n  if (xs == null) {\n    return xs;\n  }\n  const out: T[] = [];\n  // TODO(cais): Maybe improve performance by sorting.\n  for (const x of xs) {\n    if (out.indexOf(x) === -1) {\n      out.push(x);\n    }\n  }\n  return out;\n}\n\n/**\n * Determine if an Object is empty (i.e., does not have own properties).\n * @param obj Object\n * @returns Whether the Object is empty.\n * @throws ValueError: If object is `null` or `undefined`.\n */\nexport function isObjectEmpty(obj: {}): boolean {\n  if (obj == null) {\n    throw new ValueError(`Invalid value in obj: ${JSON.stringify(obj)}`);\n  }\n  for (const key in obj) {\n    if (obj.hasOwnProperty(key)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n/**\n * Helper function used to build type union/enum run-time checkers.\n * @param values The list of allowed values.\n * @param label A string name for the type\n * @param value The value to test.\n * @throws ValueError: If the value is not in values nor `undefined`/`null`.\n */\nexport function checkStringTypeUnionValue(\n    values: string[], label: string, value: string): void {\n  if 