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«Under review as a conference paper at ICLR 2016 CAPTURING MEANING IN PRODUCT REVIEWS WITH CHARACTER-LEVEL GENERATIVE TEXT MODELS Zachary C. Lipton ...»

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As each character in a review is encountered, we can plot the rating (with a granularity of 100 evenly spaced settings between 1 star and 5) which gives the review highest likelihood. Thus we can tell not only the sentiment of the rating, but the precise word, and even character at which this sentiment became clear.

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Figure 6: We plot the argmax of the review’s likelihood over many settings of the rating.

Under review as a conference paper at ICLR 2016

E NONLINEAR DYNAMICS OF NEGATION

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Figure 7: We plot the likelihood given to a review by each rating. The network learns nonlinear dynamics of negation. “Not” reduces the rating when applied to “great” but increases the rating when applied to “bad”.

Under review as a conference paper at ICLR 2016

F CLASSIFICATION RESULTS

We trained a concatenated input RNN, with item category information as the auxiliary input. Inferring the class probability via the conditional likelihoods of the review, we can use the model in reverse to predict the category of the beer described in the review. Using a balanced test set of 5000 reviews, we evaluated the classification performance of the category RNN against two multinomial regression classifiers, one trained on the top 10,000 n-grams from the training set, and the other trained on tf-idf transfromed n-grams. The confusion matrices for these experiments can be seen in Table 2, Table 3, and Table 4. We also show results for a concatenated input RNN with rating information as used to classify positive (≥ 4.0 stars) and negative (≤ 2.0 stars) reviews.

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Table 7: n-gram tf-idf positive/negative classification results on balanced dataset.

Under review as a conference paper at ICLR 2016

G A PROSPECTIVE ENCODER CONCATENATION NETWORK

In this paper, we introduced and demonstrated the efficacy of a simple technique for incorporating auxiliary information xaux in a generative RNN by concatenating it with with the character repret) sentation xchar at each sequence step. However, sometimes we don’t simply want to generate given a representation xaux, but to learn a representation of xaux. For example, to generate a characterlevel caption given an image, we might want to jointly learn a convolutional neural network to encode the image, and a generative RNN to output a caption.

To accomplish this task at the character level, we propose the following network architecture and hypothesize that is will provide the benefits of learning an encoding while preserving our ability to generate long passages at the character level. At train time the xaux is fed to an encoder, whose output is then passed as auxiliary information to a concatenated input network. At prediction time, for any input, the encoding is calculated once, after which the inference problem is identical to that of our demonstrated concatenated input network.

Figure 8: Generative model with input replication. We train the network to produce a 5 star review by concatenating the rating with the one-hot representation of each character.

Under review as a conference paper at ICLR 2016

H LEARNING CURVES

For each task, we train two unsupervised character-level donor RNNs so that we may harvest the weights for transplantation into the concatenated input networks. We train separate donor networks for the two tasks (rating and category modeling) because each is trained on a different subset of the data (the beer set is selected for class balance among the 5 categories and is thus smaller). These networks are trained until convergence (Figure 9). After transplantation, we train the concatenated input RNNs with high learning rates, to induce the weights for auxiliary information to grow quickly.

This results in an initial spike in loss (to quick to be seen in Figure 10), after which the loss quickly decreases.

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Figure 9: The learning curves for the unsupervised donor character RNNs used for weight transplantation.

(a) Rating network after transplantation (b) Category network after transplantation

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