@tensorflow/tfjs-converter
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Tensorflow model converter for javascript
242 lines • 33.9 kB
JavaScript
/**
* @license
* Copyright 2018 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 } from './tensor_utils';
/**
* The TensorArray object keeps an array of Tensors. It
* allows reading from the array and writing to the array.
*/
export class TensorArray {
constructor(name, dtype, maxSize, elementShape, identicalElementShapes, dynamicSize, clearAfterRead) {
this.name = name;
this.dtype = dtype;
this.maxSize = maxSize;
this.elementShape = elementShape;
this.identicalElementShapes = identicalElementShapes;
this.dynamicSize = dynamicSize;
this.clearAfterRead = clearAfterRead;
this.tensors = [];
this.closed_ = false;
this.idTensor = scalar(0);
keep(this.idTensor);
}
get id() {
return this.idTensor.id;
}
get closed() {
return this.closed_;
}
/**
* Dispose the tensors and idTensor and mark the TensoryArray as closed.
*/
clearAndClose(keepIds) {
this.tensors.forEach(tensor => {
if (keepIds == null || !keepIds.has(tensor.tensor.id)) {
tensor.tensor.dispose();
}
});
this.tensors = [];
this.closed_ = true;
this.idTensor.dispose();
}
size() {
return this.tensors.length;
}
/**
* Read the value at location index in the TensorArray.
* @param index Number the index to read from.
*/
read(index) {
if (this.closed_) {
throw new Error(`TensorArray ${this.name} has already been closed.`);
}
if (index < 0 || index >= this.size()) {
throw new Error(`Tried to read from index ${index}, but array size is: ${this.size()}`);
}
const tensorWithState = this.tensors[index];
if (tensorWithState.cleared) {
throw new Error(`TensorArray ${this.name}: Could not read index ${index} twice because it was cleared after a previous read ` +
`(perhaps try setting clear_after_read = false?).`);
}
if (this.clearAfterRead) {
tensorWithState.cleared = true;
}
tensorWithState.read = true;
return tensorWithState.tensor;
}
/**
* Helper method to read multiple tensors from the specified indices.
*/
readMany(indices) {
return indices.map(index => this.read(index));
}
/**
* Write value into the index of the TensorArray.
* @param index number the index to write to.
* @param tensor
*/
write(index, tensor) {
if (this.closed_) {
throw new Error(`TensorArray ${this.name} has already been closed.`);
}
if (index < 0 || !this.dynamicSize && index >= this.maxSize) {
throw new Error(`Tried to write to index ${index}, but array is not resizeable and size is: ${this.maxSize}`);
}
const t = this.tensors[index] || {};
if (tensor.dtype !== this.dtype) {
throw new Error(`TensorArray ${this.name}: Could not write to TensorArray index ${index},
because the value dtype is ${tensor.dtype}, but TensorArray dtype is ${this.dtype}.`);
}
// Set the shape for the first time write to unknow shape tensor array
if (this.size() === 0 &&
(this.elementShape == null || this.elementShape.length === 0)) {
this.elementShape = tensor.shape;
}
assertShapesMatchAllowUndefinedSize(this.elementShape, tensor.shape, `TensorArray ${this.name}: Could not write to TensorArray index ${index}.`);
if (t.read) {
throw new Error(`TensorArray ${this.name}: Could not write to TensorArray index ${index}, because it has already been read.`);
}
if (t.written) {
throw new Error(`TensorArray ${this.name}: Could not write to TensorArray index ${index}, because it has already been written.`);
}
t.tensor = tensor;
keep(tensor);
t.written = true;
this.tensors[index] = t;
}
/**
* Helper method to write multiple tensors to the specified indices.
*/
writeMany(indices, tensors) {
if (indices.length !== tensors.length) {
throw new Error(`TensorArray ${this.name}: could not write multiple tensors,` +
`because the index size: ${indices.length} is not the same as tensors size: ${tensors.length}.`);
}
indices.forEach((i, index) => this.write(i, tensors[index]));
}
/**
* Return selected values in the TensorArray as a packed Tensor. All of
* selected values must have been written and their shapes must all match.
* @param [indices] number[] Optional. Taking values in [0, max_value). If the
* TensorArray is not dynamic, max_value=size(). If not specified returns
* all tensors in the original order.
* @param [dtype]
*/
gather(indices, dtype) {
if (!!dtype && dtype !== this.dtype) {
throw new Error(`TensorArray dtype is ${this.dtype} but gather requested dtype ${dtype}`);
}
if (!indices) {
indices = [];
for (let i = 0; i < this.size(); i++) {
indices.push(i);
}
}
else {
indices = indices.slice(0, this.size());
}
if (indices.length === 0) {
return tensor([], [0].concat(this.elementShape));
}
// Read all the PersistentTensors into a vector to keep track of
// their memory.
const tensors = this.readMany(indices);
assertShapesMatchAllowUndefinedSize(this.elementShape, tensors[0].shape, 'TensorArray shape mismatch: ');
return stack(tensors, 0);
}
/**
* Return the values in the TensorArray as a concatenated Tensor.
*/
concat(dtype) {
if (!!dtype && dtype !== this.dtype) {
throw new Error(`TensorArray dtype is ${this.dtype} but concat requested dtype ${dtype}`);
}
if (this.size() === 0) {
return tensor([], [0].concat(this.elementShape));
}
const indices = [];
for (let i = 0; i < this.size(); i++) {
indices.push(i);
}
// Collect all the tensors from the tensors array.
const tensors = this.readMany(indices);
assertShapesMatchAllowUndefinedSize(this.elementShape, tensors[0].shape, `TensorArray shape mismatch: tensor array shape (${this.elementShape}) vs first tensor shape (${tensors[0].shape})`);
return concat(tensors, 0);
}
/**
* Scatter the values of a Tensor in specific indices of a TensorArray.
* @param indices number[] values in [0, max_value). If the
* TensorArray is not dynamic, max_value=size().
* @param tensor Tensor input tensor.
*/
scatter(indices, tensor) {
if (tensor.dtype !== this.dtype) {
throw new Error(`TensorArray dtype is ${this.dtype} but tensor has dtype ${tensor.dtype}`);
}
if (indices.length !== tensor.shape[0]) {
throw new Error(`Expected len(indices) == tensor.shape[0], but saw: ${indices.length} vs. ${tensor.shape[0]}`);
}
const maxIndex = Math.max(...indices);
if (!this.dynamicSize && maxIndex >= this.maxSize) {
throw new Error(`Max index must be < array size (${maxIndex} vs. ${this.maxSize})`);
}
this.writeMany(indices, unstack(tensor, 0));
}
/**
* Split the values of a Tensor into the TensorArray.
* @param length number[] with the lengths to use when splitting value along
* its first dimension.
* @param tensor Tensor, the tensor to split.
*/
split(length, tensor) {
if (tensor.dtype !== this.dtype) {
throw new Error(`TensorArray dtype is ${this.dtype} but tensor has dtype ${tensor.dtype}`);
}
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: ${tensor.shape}`);
}
if (!this.dynamicSize && length.length !== this.maxSize) {
throw new Error(`TensorArray's size is not equal to the size of lengths (${this.maxSize} vs. ${length.length}), ` +
'and the TensorArray is not marked as dynamically resizeable');
}
const elementPerRow = totalLength === 0 ? 0 : tensor.size / totalLength;
const tensors = [];
tidy(() => {
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), this.elementShape);
}
return tensors;
});
const indices = [];
for (let i = 0; i < length.length; i++) {
indices[i] = i;
}
this.writeMany(indices, tensors);
}
}
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* @license\n * Copyright 2018 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} from './tensor_utils';\n\nexport interface TensorWithState {\n  tensor?: Tensor;\n  written?: boolean;\n  read?: boolean;\n  cleared?: boolean;\n}\n/**\n * The TensorArray object keeps an array of Tensors.  It\n * allows reading from the array and writing to the array.\n */\nexport class TensorArray {\n  private tensors: TensorWithState[] = [];\n  private closed_ = false;\n  readonly idTensor: Tensor;\n  constructor(\n      readonly name: string, readonly dtype: DataType, private maxSize: number,\n      private elementShape: number[], readonly identicalElementShapes: boolean,\n      readonly dynamicSize: boolean, readonly clearAfterRead: boolean) {\n    this.idTensor = scalar(0);\n    keep(this.idTensor);\n  }\n\n  get id() {\n    return this.idTensor.id;\n  }\n\n  get closed() {\n    return this.closed_;\n  }\n\n  /**\n   * Dispose the tensors and idTensor and mark the TensoryArray as closed.\n   */\n  clearAndClose(keepIds?: Set<number>) {\n    this.tensors.forEach(tensor => {\n      if (keepIds == null || !keepIds.has(tensor.tensor.id)) {\n        tensor.tensor.dispose();\n      }\n    });\n    this.tensors = [];\n    this.closed_ = true;\n    this.idTensor.dispose();\n  }\n\n  size(): number {\n    return this.tensors.length;\n  }\n\n  /**\n   * Read the value at location index in the TensorArray.\n   * @param index Number the index to read from.\n   */\n  read(index: number): Tensor {\n    if (this.closed_) {\n      throw new Error(`TensorArray ${this.name} has already been closed.`);\n    }\n\n    if (index < 0 || index >= this.size()) {\n      throw new Error(`Tried to read from index ${index}, but array size is: ${\n          this.size()}`);\n    }\n\n    const tensorWithState = this.tensors[index];\n    if (tensorWithState.cleared) {\n      throw new Error(\n          `TensorArray ${this.name}: Could not read index ${\n              index} twice because it was cleared after a previous read ` +\n          `(perhaps try setting clear_after_read = false?).`);\n    }\n\n    if (this.clearAfterRead) {\n      tensorWithState.cleared = true;\n    }\n\n    tensorWithState.read = true;\n    return tensorWithState.tensor;\n  }\n\n  /**\n   * Helper method to read multiple tensors from the specified indices.\n   */\n  readMany(indices: number[]): Tensor[] {\n    return indices.map(index => this.read(index));\n  }\n\n  /**\n   * Write value into the index of the TensorArray.\n   * @param index number the index to write to.\n   * @param tensor\n   */\n  write(index: number, tensor: Tensor) {\n    if (this.closed_) {\n      throw new Error(`TensorArray ${this.name} has already been closed.`);\n    }\n\n    if (index < 0 || !this.dynamicSize && index >= this.maxSize) {\n      throw new Error(`Tried to write to index ${\n          index}, but array is not resizeable and size is: ${this.maxSize}`);\n    }\n\n    const t = this.tensors[index] || {};\n\n    if (tensor.dtype !== this.dtype) {\n      throw new Error(`TensorArray ${\n          this.name}: Could not write to TensorArray index ${index},\n          because the value dtype is ${\n          tensor.dtype}, but TensorArray dtype is ${this.dtype}.`);\n    }\n\n    // Set the shape for the first time write to unknow shape tensor array\n    if (this.size() === 0 &&\n        (this.elementShape == null || this.elementShape.length === 0)) {\n      this.elementShape = tensor.shape;\n    }\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, tensor.shape,\n        `TensorArray ${this.name}: Could not write to TensorArray index ${\n            index}.`);\n\n    if (t.read) {\n      throw new Error(\n          `TensorArray ${this.name}: Could not write to TensorArray index ${\n              index}, because it has already been read.`);\n    }\n\n    if (t.written) {\n      throw new Error(\n          `TensorArray ${this.name}: Could not write to TensorArray index ${\n              index}, because it has already been written.`);\n    }\n\n    t.tensor = tensor;\n    keep(tensor);\n    t.written = true;\n\n    this.tensors[index] = t;\n  }\n\n  /**\n   * Helper method to write multiple tensors to the specified indices.\n   */\n  writeMany(indices: number[], tensors: Tensor[]) {\n    if (indices.length !== tensors.length) {\n      throw new Error(\n          `TensorArray ${this.name}: could not write multiple tensors,` +\n          `because the index size: ${\n              indices.length} is not the same as tensors size: ${\n              tensors.length}.`);\n    }\n\n    indices.forEach((i, index) => this.write(i, tensors[index]));\n  }\n\n  /**\n   * Return selected values in the TensorArray as a packed Tensor. All of\n   * selected values must have been written and their shapes must all match.\n   * @param [indices] number[] Optional. Taking values in [0, max_value). If the\n   *    TensorArray is not dynamic, max_value=size(). If not specified returns\n   *    all tensors in the original order.\n   * @param [dtype]\n   */\n  gather(indices?: number[], dtype?: DataType): Tensor {\n    if (!!dtype && dtype !== this.dtype) {\n      throw new Error(`TensorArray dtype is ${\n          this.dtype} but gather requested dtype ${dtype}`);\n    }\n\n    if (!indices) {\n      indices = [];\n      for (let i = 0; i < this.size(); i++) {\n        indices.push(i);\n      }\n    } else {\n      indices = indices.slice(0, this.size());\n    }\n\n    if (indices.length === 0) {\n      return tensor([], [0].concat(this.elementShape));\n    }\n\n    // Read all the PersistentTensors into a vector to keep track of\n    // their memory.\n    const tensors = this.readMany(indices);\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, tensors[0].shape, 'TensorArray shape mismatch: ');\n\n    return stack(tensors, 0);\n  }\n\n  /**\n   * Return the values in the TensorArray as a concatenated Tensor.\n   */\n  concat(dtype?: DataType): Tensor {\n    if (!!dtype && dtype !== this.dtype) {\n      throw new Error(`TensorArray dtype is ${\n          this.dtype} but concat requested dtype ${dtype}`);\n    }\n\n    if (this.size() === 0) {\n      return tensor([], [0].concat(this.elementShape));\n    }\n\n    const indices = [];\n    for (let i = 0; i < this.size(); i++) {\n      indices.push(i);\n    }\n    // Collect all the tensors from the tensors array.\n    const tensors = this.readMany(indices);\n\n    assertShapesMatchAllowUndefinedSize(\n        this.elementShape, tensors[0].shape,\n        `TensorArray shape mismatch: tensor array shape (${\n            this.elementShape}) vs first tensor shape (${tensors[0].shape})`);\n\n    return concat(tensors, 0);\n  }\n\n  /**\n   * Scatter the values of a Tensor in specific indices of a TensorArray.\n   * @param indices number[] values in [0, max_value). If the\n   *    TensorArray is not dynamic, max_value=size().\n   * @param tensor Tensor input tensor.\n   */\n  scatter(indices: number[], tensor: Tensor) {\n    if (tensor.dtype !== this.dtype) {\n      throw new Error(`TensorArray dtype is ${\n          this.dtype} but tensor has dtype ${tensor.dtype}`);\n    }\n\n    if (indices.length !== tensor.shape[0]) {\n      throw new Error(`Expected len(indices) == tensor.shape[0], but saw: ${\n          indices.length} vs. ${tensor.shape[0]}`);\n    }\n\n    const maxIndex = Math.max(...indices);\n\n    if (!this.dynamicSize && maxIndex >= this.maxSize) {\n      throw new Error(\n          `Max index must be < array size (${maxIndex}  vs. ${this.maxSize})`);\n    }\n\n    this.writeMany(indices, unstack(tensor, 0));\n  }\n\n  /**\n   * Split the values of a Tensor into the TensorArray.\n   * @param length number[] with the lengths to use when splitting value along\n   *    its first dimension.\n   * @param tensor Tensor, the tensor to split.\n   */\n  split(length: number[], tensor: Tensor) {\n    if (tensor.dtype !== this.dtype) {\n      throw new Error(`TensorArray dtype is ${\n          this.dtype} but tensor has dtype ${tensor.dtype}`);\n    }\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: ${tensor.shape}`);\n    }\n\n    if (!this.dynamicSize && length.length !== this.maxSize) {\n      throw new Error(\n          `TensorArray's size is not equal to the size of lengths (${\n              this.maxSize} vs. ${length.length}), ` +\n          'and the TensorArray is not marked as dynamically resizeable');\n    }\n\n    const elementPerRow = totalLength === 0 ? 0 : tensor.size / totalLength;\n    const tensors: Tensor[] = [];\n    tidy(() => {\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(slice(tensor, indices, sizes), this.elementShape);\n      }\n      return tensors;\n    });\n    const indices = [];\n    for (let i = 0; i < length.length; i++) {\n      indices[i] = i;\n    }\n    this.writeMany(indices, tensors);\n  }\n}\n"]}