An obstacle to the development of many natural language processing products
is the vast amount of training examples necessary to get satisfactory results.
The generation of these examples is often a tedious and time-consuming task.
This paper this paper proposes a method to transform the sentiment of sentences
in order to limit the work necessary to generate more training data. This means
that one sentence can be transformed to an opposite sentiment sentence and
should reduce by half the work required in the generation of text. The proposed
pipeline consists of a sentiment classifier with an attention mechanism to
highlight the short phrases that determine the sentiment of a sentence. Then,
these phrases are changed to phrases of the opposite sentiment using a baseline
model and an autoencoder approach. Experiments are run on both the separate
parts of the pipeline as well as on the end-to-end model. The sentiment
classifier is tested on its accuracy and is found to perform adequately. The
autoencoder is tested on how well it is able to change the sentiment of an
encoded phrase and it was found that such a task is possible. We use human
evaluation to judge the performance of the full (end-to-end) pipeline and that
reveals that a model using word vectors outperforms the encoder model.
Numerical evaluation shows that a success rate of 54.7% is achieved on the
sentiment change.

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