61 lines
2.2 KiB
TypeScript
61 lines
2.2 KiB
TypeScript
/**
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* @license
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* Copyright 2019 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 * as tf from '@tensorflow/tfjs-core';
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/**
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* A dataset for webcam controls which allows the user to add example Tensors
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* for particular labels. This object will concat them into two large xs and ys.
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*/
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export class Dataset {
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xs: tf.Tensor[];
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ys: tf.Tensor;
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constructor(public numClasses: number) {}
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/**
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* Adds an example to the controller dataset.
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* @param {Tensor} example A tensor representing the example.
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* It can be an image, an activation, or any other type of Tensor.
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* @param {number} label The label of the example. Should be an number.
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*/
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addExample(example: tf.Tensor|tf.Tensor[], label: number) {
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example = Array.isArray(example) ? example : [example];
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// One-hot encode the label.
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const y =
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tf.tidy(() => tf.oneHot(tf.tensor1d([label]).toInt(), this.numClasses));
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if (this.xs == null) {
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// For the first example that gets added, keep example and y so that the
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// Dataset owns the memory of the inputs. This makes sure that
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// if addExample() is called in a tf.tidy(), these Tensors will not get
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// disposed.
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this.xs = example.map(tensor => tf.keep(tensor));
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this.ys = tf.keep(y);
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} else {
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const oldX = this.xs;
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this.xs = example.map(
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(tensor, index) => tf.keep(this.xs[index].concat(tensor, 0)));
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const oldY = this.ys;
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this.ys = tf.keep(oldY.concat(y, 0));
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oldX.forEach(tensor => tensor.dispose());
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oldY.dispose();
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y.dispose();
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}
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}
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}
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