/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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import {Tensor} from './tensor';
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import {TensorContainer, TensorContainerArray} from './tensor_types';
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import {upcastType} from './types';
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import {assert} from './util';
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export function makeTypesMatch<T extends Tensor>(a: T, b: T): [T, T] {
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if (a.dtype === b.dtype) {
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return [a, b];
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}
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const dtype = upcastType(a.dtype, b.dtype);
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return [a.cast(dtype), b.cast(dtype)];
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}
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export function assertTypesMatch(a: Tensor, b: Tensor): void {
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assert(
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a.dtype === b.dtype,
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() => `The dtypes of the first(${a.dtype}) and` +
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` second(${b.dtype}) input must match`);
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}
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export function isTensorInList(tensor: Tensor, tensorList: Tensor[]): boolean {
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return tensorList.some(x => x.id === tensor.id);
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}
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/**
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* Extracts any `Tensor`s found within the provided object.
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*
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* @param container an object that may be a `Tensor` or may directly contain
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* `Tensor`s, such as a `Tensor[]` or `{key: Tensor, ...}`. In general it
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* is safe to pass any object here, except that `Promise`s are not
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* supported.
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* @returns An array of `Tensors` found within the passed object. If the
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* argument is simply a `Tensor', a list containing that `Tensor` is
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* returned. If the object is not a `Tensor` or does not
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* contain `Tensors`, an empty list is returned.
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*/
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export function getTensorsInContainer(result: TensorContainer): Tensor[] {
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const list: Tensor[] = [];
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const seen = new Set<{}|void>();
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walkTensorContainer(result, list, seen);
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return list;
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}
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function walkTensorContainer(
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container: TensorContainer, list: Tensor[], seen: Set<{}|void>): void {
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if (container == null) {
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return;
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}
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if (container instanceof Tensor) {
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list.push(container);
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return;
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}
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if (!isIterable(container)) {
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return;
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}
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// Iteration over keys works also for arrays.
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const iterable = container as TensorContainerArray;
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for (const k in iterable) {
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const val = iterable[k];
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if (!seen.has(val)) {
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seen.add(val);
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walkTensorContainer(val, list, seen);
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}
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}
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}
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// tslint:disable-next-line:no-any
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function isIterable(obj: any): boolean {
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return Array.isArray(obj) || typeof obj === 'object';
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}
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