The Neural Structured Learning Framework

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track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Neural Structured Learning" > Neural Structured Learning </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://www.tensorflow.org/neural_structured_learning/framework" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="4" track-type="globalNav" track-name="breadcrumb" track-metadata-position="4" track-metadata-eventdetail="" > Guide & Tutorials </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> The Neural Structured Learning Framework </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p><devsite-mathjax config="TeX-AMS-MML_SVG"></devsite-mathjax> </p>  <p>Neural Structured Learning (NSL) focuses on training deep neural networks by leveraging structured signals (when available) along with feature inputs. As introduced by <a href="https://research.google/pubs/pub46568.pdf">Bui et al. (WSDM'18)</a>, these structured signals are used to regularize the training of a neural network, forcing the model to learn accurate predictions (by minimizing supervised loss), while at the same time maintaining the input structural similarity (by minimizing the neighbor loss, see the figure below). This technique is generic and can be applied on arbitrary neural architectures (such as Feed-forward NNs, Convolutional NNs and Recurrent NNs).</p> <p><img src="/static/neural_structured_learning/images/nlink_figure.png" alt="NSL Concept"></p> <p>Note that the generalized neighbor loss equation is flexible and can have other forms besides the one illustrated above. For example, we can also select $\sum_{x_j \in \mathcal{N}(x_i)}\mathcal{E}(y_i,g_\theta(x_j))$ to be the neighbor loss, which calculates the distance between the ground truth $y_i$ and the prediction from the neighbor $g_\theta(x_j)$. This is commonly used in adversarial learning <a href="https://arxiv.org/pdf/1412.6572.pdf">(Goodfellow et al., ICLR'15)</a>. Therefore, NSL generalizes to <strong>Neural Graph Learning</strong> if neighbors are explicitly represented by a graph, and to <strong>Adversarial Learning</strong> if neighbors are implicitly induced by adversarial perturbation.</p> <p>The overall workflow for Neural Structured Learning is illustrated below. Black arrows represent the conventional training workflow and red arrows represent the new workflow as introduced by NSL to leverage structured signals. First, the training samples are augmented to include structured signals. When structured signals are not explicitly provided, they can be either constructed or induced (the latter applies to adversarial learning). Next, the augmented training samples (including both original samples and their corresponding neighbors) are fed to the neural network for calculating their embeddings. The distance between a sample's embedding and its neighbor's embedding is calculated and used as the neighbor loss, which is treated as a regularization term and added to the final loss. For explicit neighbor-based regularization, we typically compute the neighbor loss as the distance between the sample's embedding and the neighbor's embedding. However, any layer of the neural network may be used to compute the neighbor loss. On the other hand, for induced neighbor-based regularization (adversarial), we compute the neighbor loss as the distance between the output prediction of the induced adversarial neighbor and the ground truth label.</p> <p><img src="/static/neural_structured_learning/images/workflow_overview.png" alt="NSL workflow"></p> <h2 id="why_use_nsl" data-text="Why use NSL?" tabindex="-1">Why use NSL?</h2> <p>NSL brings the following advantages:</p> <ul> <li><strong>Higher accuracy</strong>: the structured signal(s) among samples can provide information that is not always available in feature inputs; therefore, the joint training approach (with both structured signals and features) has been shown to outperform many existing methods (that rely on training with features only) on a wide range of tasks, such as document classification and semantic intent classification (<a href="https://research.google/pubs/pub46568.pdf">Bui et al., WSDM'18</a> & <a href="https://arxiv.org/pdf/1609.02907.pdf">Kipf et al., ICLR'17</a>).</li> <li><strong>Robustness</strong>: models trained with adversarial examples have been shown to be robust against adversarial perturbations designed for misleading a model's prediction or classification (<a href="https://arxiv.org/pdf/1412.6572.pdf">Goodfellow et al., ICLR'15</a> & <a href="https://arxiv.org/pdf/1704.03976.pdf">Miyato et al., ICLR'16</a>). When the number of training samples is small, training with adversarial examples also helps improve model accuracy (<a href="https://arxiv.org/pdf/1805.12152.pdf">Tsipras et al., ICLR'19</a>).</li> <li><strong>Less labeled data required</strong>: NSL enables neural networks to harness both labeled and unlabeled data, which extends the learning paradigm to <a href="https://en.wikipedia.org/wiki/Semi-supervised_learning">semi-supervised learning</a>. Specifically, NSL allows the network to train using labeled data as in the supervised setting, and at the same time drives the network to learn similar hidden representations for the "neighboring samples" that may or may not have labels. This technique has shown great promise for improving model accuracy when the amount of labeled data is relatively small (<a href="https://research.google/pubs/pub46568.pdf">Bui et al., WSDM'18</a> & <a href="https://arxiv.org/pdf/1704.03976.pdf">Miyato et al., ICLR'16</a>).</li> </ul> <h2 id="step-by-step_tutorials" data-text="Step-by-step Tutorials" tabindex="-1">Step-by-step Tutorials</h2> <p>To obtain hands-on experience with Neural Structured Learning, we have tutorials that cover various scenarios where structured signals may be explicitly given, constructed, or induced. Here are a few:</p> <ul> <li><p><a href="/neural_structured_learning/tutorials/graph_keras_mlp_cora">Graph regularization for document classification using natural graphs</a>. In this tutorial, we explore the use of graph regularization to classify documents that form a natural (organic) graph.</p></li> <li><p><a href="/neural_structured_learning/tutorials/graph_keras_lstm_imdb">Graph regularization for sentiment classification using synthesized graphs</a>. In this tutorial, we demonstrate the use of graph regularization to classify movie review sentiments by constructing (synthesizing) structured signals.</p></li> <li><p><a href="/neural_structured_learning/tutorials/adversarial_keras_cnn_mnist">Adversarial learning for image classification</a>. In this tutorial, we explore the use of adversarial learning (where structured signals are induced) to classify images containing numeric digits.</p></li> </ul> <p>More examples and tutorials can be found in the <a href="https://github.com/tensorflow/neural-structured-learning/tree/master/neural_structured_learning/examples">examples</a> directory of our GitHub repository.</p> </div> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. For details, see the <a href="https://developers.google.com/site-policies">Google Developers Site Policies</a>. 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