/**
 * @license
 * Copyright 2020 Google Inc. 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.
 * =============================================================================
 */

import {ENGINE} from '../engine';
import {Identity} from '../kernel_names';

import {Tensor} from '../tensor';
import {convertToTensor} from '../tensor_util_env';
import {TensorLike} from '../types';

import {op} from './operation';

/**
 * Creates a new tensor with the same values and shape as the specified
 * tensor.
 *
 * ```js
 * const x = tf.tensor([1, 2]);
 *
 * x.clone().print();
 * ```
 *
 * @param x The tensor to clone.
 */
/** @doc {heading: 'Tensors', subheading: 'Creation'} */
function clone_<T extends Tensor>(x: T|TensorLike): T {
  const $x = convertToTensor(x, 'x', 'clone', null);
  const forward = () =>
      ENGINE.makeTensorFromDataId($x.dataId, $x.shape, $x.dtype) as T;

  // Note this op is called tf.identity in python. Hence the kernel name used
  // here.
  return ENGINE.runKernelFunc(forward, {x: $x}, null /* grad */, Identity);
}

export const clone = op({clone_});