@tensorflow/tfjs-converter/dist/executor/tensor_list.js

/**
 * @license
 * Copyright 2020 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.
 * =============================================================================
 */
import { concat, keep, reshape, scalar, slice, stack, tensor, tidy, unstack } from '@tensorflow/tfjs-core';
import { assertShapesMatchAllowUndefinedSize, inferElementShape, mergeElementShape } from './tensor_utils';
/**
 * TensorList stores a container of `tf.Tensor` objects, which are accessible
 * via tensors field.
 *
 * In order to get a copy of the underlying list, use the copy method:
 * ```
 *    TensorList b = a.copy();
 *    b.tensors().pushBack(t);  // This does not modify a.tensors().
 * ```
 *
 * Note that this is not a deep copy: the memory locations of the underlying
 * tensors will still point to the same locations of the corresponding tensors
 * in the original.
 */
export class TensorList {
    /**
     *
     * @param tensors list of tensors
     * @param elementShape shape of each tensor, this can be a single number (any
     * shape is allowed) or partial shape (dim = -1).
     * @param elementDtype data type of each tensor
     * @param maxNumElements The maximum allowed size of `tensors`. Defaults to -1
     *   meaning that the size of `tensors` is unbounded.
     */
    constructor(tensors, elementShape, elementDtype, maxNumElements = -1) {
        this.tensors = tensors;
        this.elementShape = elementShape;
        this.elementDtype = elementDtype;
        if (tensors != null) {
            tensors.forEach(tensor => {
                if (elementDtype !== tensor.dtype) {
                    throw new Error(`Invalid data types; op elements ${elementDtype}, but list elements ${tensor.dtype}`);
                }
                assertShapesMatchAllowUndefinedSize(elementShape, tensor.shape, 'TensorList shape mismatch: ');
                keep(tensor);
            });
        }
        this.idTensor = scalar(0);
        this.maxNumElements = maxNumElements;
        keep(this.idTensor);
    }
    get id() {
        return this.idTensor.id;
    }
    /**
     * Get a new TensorList containing a copy of the underlying tensor container.
     */
    copy() {
        return new TensorList([...this.tensors], this.elementShape, this.elementDtype);
    }
    /**
     * Dispose the tensors and idTensor and clear the tensor list.
     */
    clearAndClose(keepIds) {
        this.tensors.forEach(tensor => {
            if (keepIds == null || !keepIds.has(tensor.id)) {
                tensor.dispose();
            }
        });
        this.tensors.length = 0;
        this.idTensor.dispose();
    }
    /**
     * The size of the tensors in the tensor list.
     */
    size() {
        return this.tensors.length;
    }
    /**
     * Return a tensor that stacks a list of rank-R tf.Tensors into one rank-(R+1)
     * tf.Tensor.
     * @param elementShape shape of each tensor
     * @param elementDtype data type of each tensor
     * @param numElements the number of elements to stack
     */
    stack(elementShape, elementDtype, numElements = -1) {
        if (elementDtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${elementDtype}, but list elements ${this.elementDtype}`);
        }
        if (numElements !== -1 && this.tensors.length !== numElements) {
            throw new Error(`Operation expected a list with ${numElements} elements but got a list with ${this.tensors.length} elements.`);
        }
        assertShapesMatchAllowUndefinedSize(elementShape, this.elementShape, 'TensorList shape mismatch: ');
        const outputElementShape = inferElementShape(this.elementShape, this.tensors, elementShape);
        return tidy(() => {
            const reshapedTensors = this.tensors.map(tensor => reshape(tensor, outputElementShape));
            return stack(reshapedTensors, 0);
        });
    }
    /**
     * Pop a tensor from the end of the list.
     * @param elementShape shape of the tensor
     * @param elementDtype data type of the tensor
     */
    popBack(elementShape, elementDtype) {
        if (elementDtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${elementDtype}, but list elements ${this.elementDtype}`);
        }
        if (this.size() === 0) {
            throw new Error('Trying to pop from an empty list.');
        }
        const outputElementShape = inferElementShape(this.elementShape, this.tensors, elementShape);
        const tensor = this.tensors.pop();
        assertShapesMatchAllowUndefinedSize(tensor.shape, elementShape, 'TensorList shape mismatch: ');
        return reshape(tensor, outputElementShape);
    }
    /**
     * Push a tensor to the end of the list.
     * @param tensor Tensor to be pushed.
     */
    pushBack(tensor) {
        if (tensor.dtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${tensor.dtype}, but list elements ${this.elementDtype}`);
        }
        assertShapesMatchAllowUndefinedSize(tensor.shape, this.elementShape, 'TensorList shape mismatch: ');
        if (this.maxNumElements === this.size()) {
            throw new Error(`Trying to push element into a full list.`);
        }
        keep(tensor);
        this.tensors.push(tensor);
    }
    /**
     * Update the size of the list.
     * @param size the new size of the list.
     */
    resize(size) {
        if (size < 0) {
            throw new Error(`TensorListResize expects size to be non-negative. Got: ${size}`);
        }
        if (this.maxNumElements !== -1 && size > this.maxNumElements) {
            throw new Error(`TensorListResize input size ${size} is greater maxNumElement ${this.maxNumElements}.`);
        }
        this.tensors.length = size;
    }
    /**
     * Retrieve the element at the provided index
     * @param elementShape shape of the tensor
     * @param elementDtype dtype of the tensor
     * @param elementIndex index of the tensor
     */
    getItem(elementIndex, elementShape, elementDtype) {
        if (elementDtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${elementDtype}, but list elements ${this.elementDtype}`);
        }
        if (elementIndex < 0 || elementIndex > this.tensors.length) {
            throw new Error(`Trying to access element ${elementIndex} in a list with ${this.tensors.length} elements.`);
        }
        if (this.tensors[elementIndex] == null) {
            throw new Error(`element at index ${elementIndex} is null.`);
        }
        assertShapesMatchAllowUndefinedSize(this.tensors[elementIndex].shape, elementShape, 'TensorList shape mismatch: ');
        const outputElementShape = inferElementShape(this.elementShape, this.tensors, elementShape);
        return reshape(this.tensors[elementIndex], outputElementShape);
    }
    /**
     * Set the tensor at the index
     * @param elementIndex index of the tensor
     * @param tensor the tensor to be inserted into the list
     */
    setItem(elementIndex, tensor) {
        if (tensor.dtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${tensor.dtype}, but list elements ${this.elementDtype}`);
        }
        if (elementIndex < 0 ||
            this.maxNumElements !== -1 && elementIndex >= this.maxNumElements) {
            throw new Error(`Trying to set element ${elementIndex} in a list with max ${this.maxNumElements} elements.`);
        }
        assertShapesMatchAllowUndefinedSize(this.elementShape, tensor.shape, 'TensorList shape mismatch: ');
        keep(tensor);
        this.tensors[elementIndex] = tensor;
    }
    /**
     * Return selected values in the TensorList as a stacked Tensor. All of
     * selected values must have been written and their shapes must all match.
     * @param indices indices of tensors to gather
     * @param elementDtype output tensor dtype
     * @param elementShape output tensor element shape
     */
    gather(indices, elementDtype, elementShape) {
        if (elementDtype !== this.elementDtype) {
            throw new Error(`Invalid data types; op elements ${elementDtype}, but list elements ${this.elementDtype}`);
        }
        assertShapesMatchAllowUndefinedSize(this.elementShape, elementShape, 'TensorList shape mismatch: ');
        // When indices is greater than the size of the list, indices beyond the
        // size of the list are ignored.
        indices = indices.slice(0, this.size());
        const outputElementShape = inferElementShape(this.elementShape, this.tensors, elementShape);
        if (indices.length === 0) {
            return tensor([], [0].concat(outputElementShape));
        }
        return tidy(() => {
            const tensors = indices.map(i => reshape(this.tensors[i], outputElementShape));
            return stack(tensors, 0);
        });
    }
    /**
     * Return the values in the TensorList as a concatenated Tensor.
     * @param elementDtype output tensor dtype
     * @param elementShape output tensor element shape
     */
    concat(elementDtype, elementShape) {
        if (!!elementDtype && elementDtype !== this.elementDtype) {
            throw new Error(`TensorList dtype is ${this.elementDtype} but concat requested dtype ${elementDtype}`);
        }
        assertShapesMatchAllowUndefinedSize(this.elementShape, elementShape, 'TensorList shape mismatch: ');
        const outputElementShape = inferElementShape(this.elementShape, this.tensors, elementShape);
        if (this.size() === 0) {
            return tensor([], [0].concat(outputElementShape));
        }
        return tidy(() => {
            const tensors = this.tensors.map(t => reshape(t, outputElementShape));
            return concat(tensors, 0);
        });
    }
}
/**
 * Creates a TensorList which, when stacked, has the value of tensor.
 * @param tensor from tensor
 * @param elementShape output tensor element shape
 */
export function fromTensor(tensor, elementShape, elementDtype) {
    const dtype = tensor.dtype;
    if (tensor.shape.length < 1) {
        throw new Error(`Tensor must be at least a vector, but saw shape: ${tensor.shape}`);
    }
    if (tensor.dtype !== elementDtype) {
        throw new Error(`Invalid data types; op elements ${tensor.dtype}, but list elements ${elementDtype}`);
    }
    const tensorElementShape = tensor.shape.slice(1);
    assertShapesMatchAllowUndefinedSize(tensorElementShape, elementShape, 'TensorList shape mismatch: ');
    const tensorList = unstack(tensor);
    return new TensorList(tensorList, elementShape, dtype);
}
/**
 * Return a TensorList of the given size with empty elements.
 * @param elementShape the shape of the future elements of the list
 * @param elementDtype the desired type of elements in the list
 * @param numElements the number of elements to reserve
 */
export function reserve(elementShape, elementDtype, numElements) {
    return new TensorList([], elementShape, elementDtype, numElements);
}
/**
 * Put tensors at specific indices of a stacked tensor into a TensorList.
 * @param indices list of indices on how to scatter the tensor.
 * @param tensor input tensor.
 * @param elementShape the shape of the future elements of the list
 * @param numElements the number of elements to scatter
 */
export function scatter(tensor, indices, elementShape, numElements) {
    if (indices.length !== tensor.shape[0]) {
        throw new Error(`Expected len(indices) == tensor.shape[0], but saw: ${indices.length} vs. ${tensor.shape[0]}`);
    }
    const maxIndex = Math.max(...indices);
    if (numElements != null && numElements !== -1 && maxIndex >= numElements) {
        throw new Error(`Max index must be < array size (${maxIndex}  vs. ${numElements})`);
    }
    const list = new TensorList([], elementShape, tensor.dtype, numElements);
    const tensors = unstack(tensor, 0);
    indices.forEach((value, index) => {
        list.setItem(value, tensors[index]);
    });
    return list;
}
/**
 * Split the values of a Tensor into a TensorList.
 * @param length the lengths to use when splitting value along
 *    its first dimension.
 * @param tensor the tensor to split.
 * @param elementShape the shape of the future elements of the list
 */
export function split(tensor, length, elementShape) {
    let totalLength = 0;
    const cumulativeLengths = length.map(len => {
        totalLength += len;
        return totalLength;
    });
    if (totalLength !== tensor.shape[0]) {
        throw new Error(`Expected sum of lengths to be equal to
          tensor.shape[0], but sum of lengths is
        ${totalLength}, and tensor's shape is: ${tensor.shape}`);
    }
    const shapeWithoutFirstDim = tensor.shape.slice(1);
    const outputElementShape = mergeElementShape(shapeWithoutFirstDim, elementShape);
    const elementPerRow = totalLength === 0 ? 0 : tensor.size / totalLength;
    const tensors = tidy(() => {
        const tensors = [];
        tensor = reshape(tensor, [1, totalLength, elementPerRow]);
        for (let i = 0; i < length.length; ++i) {
            const previousLength = (i === 0) ? 0 : cumulativeLengths[i - 1];
            const indices = [0, previousLength, 0];
            const sizes = [1, length[i], elementPerRow];
            tensors[i] = reshape(slice(tensor, indices, sizes), outputElementShape);
        }
        tensor.dispose();
        return tensors;
    });
    const list = new TensorList([], elementShape, tensor.dtype, length.length);
    for (let i = 0; i < tensors.length; i++) {
        list.setItem(i, tensors[i]);
    }
    return list;
}
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* @license\n * Copyright 2020 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {concat, DataType, keep, reshape, scalar, slice, stack, Tensor, tensor, tidy, unstack} from '@tensorflow/tfjs-core';\n\nimport {assertShapesMatchAllowUndefinedSize, inferElementShape, mergeElementShape} from './tensor_utils';\n\n/**\n * TensorList stores a container of `tf.Tensor` objects, which are accessible\n * via tensors field.\n *\n * In order to get a copy of the underlying list, use the copy method:\n * ```\n *    TensorList b = a.copy();\n *    b.tensors().pushBack(t);  // This does not modify a.tensors().\n * ```\n *\n * Note that this is not a deep copy: the memory locations of the underlying\n * tensors will still point to the same locations of the corresponding tensors\n * in the original.\n */\n\nexport class TensorList {\n  readonly idTensor: Tensor;\n  maxNumElements: number;\n\n  get id() {\n    return this.idTensor.id;\n  }\n  /**\n   *\n   * @param tensors list of tensors\n   * @param elementShape shape of each tensor, this can be a single number (any\n   * shape is allowed) or partial shape (dim = -1).\n   * @param elementDtype data type of each tensor\n   * @param maxNumElements The maximum allowed size of `tensors`. Defaults to -1\n   *   meaning that the size of `tensors` is unbounded.\n   */\n  constructor(\n      readonly tensors: Tensor[], readonly elementShape: number|number[],\n      readonly elementDtype: DataType, maxNumElements = -1) {\n    if (tensors != null) {\n      tensors.forEach(tensor => {\n        if (elementDtype !== tensor.dtype) {\n          throw new Error(`Invalid data types; op elements ${\n              elementDtype}, but list elements ${tensor.dtype}`);\n        }\n        assertShapesMatchAllowUndefinedSize(\n            elementShape, tensor.shape, 'TensorList shape mismatch: ');\n\n        keep(tensor);\n      });\n    }\n    this.idTensor = scalar(0);\n    this.maxNumElements = maxNumElements;\n    keep(this.idTensor);\n  }\n\n  /**\n   * Get a new TensorList containing a copy of the underlying tensor container.\n   */\n  copy(): TensorList {\n    return new TensorList(\n        [...this.tensors], this.elementShape, this.elementDtype);\n  }\n\n  /**\n   * Dispose the tensors and idTensor and clear the tensor list.\n   */\n  clearAndClose(keepIds?: Set<number>) {\n    this.tensors.forEach(tensor => {\n      if (keepIds == null || !keepIds.has(tensor.id)) {\n        tensor.dispose();\n      }\n    });\n    this.tensors.length = 0;\n    this.idTensor.dispose();\n  }\n  /**\n   * The size of the tensors in the tensor list.\n   */\n  size() {\n    return this.tensors.length;\n  }\n\n  /**\n   * Return a tensor that stacks a list of rank-R tf.Tensors into one rank-(R+1)\n   * tf.Tensor.\n   * @param elementShape shape of each tensor\n   * @param elementDtype data type of each tensor\n   * @param numElements the number of elements to stack\n   */\n  stack(elementShape: number[], elementDtype: DataType, numElements = -1):\n      Tensor {\n    if (elementDtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          elementDtype}, but list elements ${this.elementDtype}`);\n    }\n    if (numElements !== -1 && this.tensors.length !== numElements) {\n      throw new Error(`Operation expected a list with ${\n          numElements} elements but got a list with ${\n          this.tensors.length} elements.`);\n    }\n    assertShapesMatchAllowUndefinedSize(\n        elementShape, this.elementShape, 'TensorList shape mismatch: ');\n    const outputElementShape =\n        inferElementShape(this.elementShape, this.tensors, elementShape);\n    return tidy(() => {\n      const reshapedTensors =\n          this.tensors.map(tensor => reshape(tensor, outputElementShape));\n      return stack(reshapedTensors, 0);\n    });\n  }\n\n  /**\n   * Pop a tensor from the end of the list.\n   * @param elementShape shape of the tensor\n   * @param elementDtype data type of the tensor\n   */\n  popBack(elementShape: number[], elementDtype: DataType): Tensor {\n    if (elementDtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          elementDtype}, but list elements ${this.elementDtype}`);\n    }\n\n    if (this.size() === 0) {\n      throw new Error('Trying to pop from an empty list.');\n    }\n    const outputElementShape =\n        inferElementShape(this.elementShape, this.tensors, elementShape);\n    const tensor = this.tensors.pop();\n\n    assertShapesMatchAllowUndefinedSize(\n        tensor.shape, elementShape, 'TensorList shape mismatch: ');\n\n    return reshape(tensor, outputElementShape);\n  }\n\n  /**\n   * Push a tensor to the end of the list.\n   * @param tensor Tensor to be pushed.\n   */\n  pushBack(tensor: Tensor) {\n    if (tensor.dtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          tensor.dtype}, but list elements ${this.elementDtype}`);\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        tensor.shape, this.elementShape, 'TensorList shape mismatch: ');\n\n    if (this.maxNumElements === this.size()) {\n      throw new Error(`Trying to push element into a full list.`);\n    }\n    keep(tensor);\n    this.tensors.push(tensor);\n  }\n\n  /**\n   * Update the size of the list.\n   * @param size the new size of the list.\n   */\n  resize(size: number) {\n    if (size < 0) {\n      throw new Error(\n          `TensorListResize expects size to be non-negative. Got: ${size}`);\n    }\n\n    if (this.maxNumElements !== -1 && size > this.maxNumElements) {\n      throw new Error(`TensorListResize input size ${\n          size} is greater maxNumElement ${this.maxNumElements}.`);\n    }\n    this.tensors.length = size;\n  }\n\n  /**\n   * Retrieve the element at the provided index\n   * @param elementShape shape of the tensor\n   * @param elementDtype dtype of the tensor\n   * @param elementIndex index of the tensor\n   */\n  getItem(elementIndex: number, elementShape: number[], elementDtype: DataType):\n      Tensor {\n    if (elementDtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          elementDtype}, but list elements ${this.elementDtype}`);\n    }\n    if (elementIndex < 0 || elementIndex > this.tensors.length) {\n      throw new Error(`Trying to access element ${\n          elementIndex} in a list with ${this.tensors.length} elements.`);\n    }\n\n    if (this.tensors[elementIndex] == null) {\n      throw new Error(`element at index ${elementIndex} is null.`);\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        this.tensors[elementIndex].shape, elementShape,\n        'TensorList shape mismatch: ');\n    const outputElementShape =\n        inferElementShape(this.elementShape, this.tensors, elementShape);\n    return reshape(this.tensors[elementIndex], outputElementShape);\n  }\n\n  /**\n   * Set the tensor at the index\n   * @param elementIndex index of the tensor\n   * @param tensor the tensor to be inserted into the list\n   */\n  setItem(elementIndex: number, tensor: Tensor) {\n    if (tensor.dtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          tensor.dtype}, but list elements ${this.elementDtype}`);\n    }\n\n    if (elementIndex < 0 ||\n        this.maxNumElements !== -1 && elementIndex >= this.maxNumElements) {\n      throw new Error(`Trying to set element ${\n          elementIndex} in a list with max ${this.maxNumElements} elements.`);\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, tensor.shape, 'TensorList shape mismatch: ');\n    keep(tensor);\n    this.tensors[elementIndex] = tensor;\n  }\n\n  /**\n   * Return selected values in the TensorList as a stacked Tensor. All of\n   * selected values must have been written and their shapes must all match.\n   * @param indices indices of tensors to gather\n   * @param elementDtype output tensor dtype\n   * @param elementShape output tensor element shape\n   */\n  gather(indices: number[], elementDtype: DataType, elementShape: number[]):\n      Tensor {\n    if (elementDtype !== this.elementDtype) {\n      throw new Error(`Invalid data types; op elements ${\n          elementDtype}, but list elements ${this.elementDtype}`);\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, elementShape, 'TensorList shape mismatch: ');\n\n    // When indices is greater than the size of the list, indices beyond the\n    // size of the list are ignored.\n    indices = indices.slice(0, this.size());\n    const outputElementShape =\n        inferElementShape(this.elementShape, this.tensors, elementShape);\n    if (indices.length === 0) {\n      return tensor([], [0].concat(outputElementShape));\n    }\n\n    return tidy(() => {\n      const tensors =\n          indices.map(i => reshape(this.tensors[i], outputElementShape));\n      return stack(tensors, 0);\n    });\n  }\n\n  /**\n   * Return the values in the TensorList as a concatenated Tensor.\n   * @param elementDtype output tensor dtype\n   * @param elementShape output tensor element shape\n   */\n  concat(elementDtype: DataType, elementShape: number[]): Tensor {\n    if (!!elementDtype && elementDtype !== this.elementDtype) {\n      throw new Error(`TensorList dtype is ${\n          this.elementDtype} but concat requested dtype ${elementDtype}`);\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, elementShape, 'TensorList shape mismatch: ');\n    const outputElementShape =\n        inferElementShape(this.elementShape, this.tensors, elementShape);\n\n    if (this.size() === 0) {\n      return tensor([], [0].concat(outputElementShape));\n    }\n    return tidy(() => {\n      const tensors = this.tensors.map(t => reshape(t, outputElementShape));\n      return concat(tensors, 0);\n    });\n  }\n}\n\n/**\n * Creates a TensorList which, when stacked, has the value of tensor.\n * @param tensor from tensor\n * @param elementShape output tensor element shape\n */\nexport function fromTensor(\n    tensor: Tensor, elementShape: number[], elementDtype: DataType) {\n  const dtype = tensor.dtype;\n  if (tensor.shape.length < 1) {\n    throw new Error(\n        `Tensor must be at least a vector, but saw shape: ${tensor.shape}`);\n  }\n  if (tensor.dtype !== elementDtype) {\n    throw new Error(`Invalid data types; op elements ${\n        tensor.dtype}, but list elements ${elementDtype}`);\n  }\n  const tensorElementShape = tensor.shape.slice(1);\n  assertShapesMatchAllowUndefinedSize(\n      tensorElementShape, elementShape, 'TensorList shape mismatch: ');\n  const tensorList: Tensor[] = unstack(tensor);\n  return new TensorList(tensorList, elementShape, dtype);\n}\n\n/**\n * Return a TensorList of the given size with empty elements.\n * @param elementShape the shape of the future elements of the list\n * @param elementDtype the desired type of elements in the list\n * @param numElements the number of elements to reserve\n */\nexport function reserve(\n    elementShape: number[], elementDtype: DataType, numElements: number) {\n  return new TensorList([], elementShape, elementDtype, numElements);\n}\n\n/**\n * Put tensors at specific indices of a stacked tensor into a TensorList.\n * @param indices list of indices on how to scatter the tensor.\n * @param tensor input tensor.\n * @param elementShape the shape of the future elements of the list\n * @param numElements the number of elements to scatter\n */\nexport function scatter(\n    tensor: Tensor, indices: number[], elementShape: number[],\n    numElements?: number): TensorList {\n  if (indices.length !== tensor.shape[0]) {\n    throw new Error(`Expected len(indices) == tensor.shape[0], but saw: ${\n        indices.length} vs. ${tensor.shape[0]}`);\n  }\n\n  const maxIndex = Math.max(...indices);\n\n  if (numElements != null && numElements !== -1 && maxIndex >= numElements) {\n    throw new Error(\n        `Max index must be < array size (${maxIndex}  vs. ${numElements})`);\n  }\n\n  const list = new TensorList([], elementShape, tensor.dtype, numElements);\n  const tensors = unstack(tensor, 0);\n  indices.forEach((value, index) => {\n    list.setItem(value, tensors[index]);\n  });\n  return list;\n}\n\n/**\n * Split the values of a Tensor into a TensorList.\n * @param length the lengths to use when splitting value along\n *    its first dimension.\n * @param tensor the tensor to split.\n * @param elementShape the shape of the future elements of the list\n */\nexport function split(\n    tensor: Tensor, length: number[], elementShape: number[]) {\n  let totalLength = 0;\n  const cumulativeLengths = length.map(len => {\n    totalLength += len;\n    return totalLength;\n  });\n\n  if (totalLength !== tensor.shape[0]) {\n    throw new Error(`Expected sum of lengths to be equal to\n          tensor.shape[0], but sum of lengths is\n        ${totalLength}, and tensor's shape is: ${tensor.shape}`);\n  }\n\n  const shapeWithoutFirstDim = tensor.shape.slice(1);\n  const outputElementShape =\n      mergeElementShape(shapeWithoutFirstDim, elementShape);\n  const elementPerRow = totalLength === 0 ? 0 : tensor.size / totalLength;\n  const tensors: Tensor[] = tidy(() => {\n    const tensors = [];\n    tensor = reshape(tensor, [1, totalLength, elementPerRow]);\n    for (let i = 0; i < length.length; ++i) {\n      const previousLength = (i === 0) ? 0 : cumulativeLengths[i - 1];\n      const indices = [0, previousLength, 0];\n      const sizes = [1, length[i], elementPerRow];\n      tensors[i] = reshape(\n          slice(tensor, indices, sizes), outputElementShape as number[]);\n    }\n    tensor.dispose();\n    return tensors;\n  });\n\n  const list = new TensorList([], elementShape, tensor.dtype, length.length);\n\n  for (let i = 0; i < tensors.length; i++) {\n    list.setItem(i, tensors[i]);\n  }\n  return list;\n}\n"]}