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Deep Learning Approaches to Text Production. Shashi NarayanЧитать онлайн книгу.

Deep Learning Approaches to Text Production - Shashi Narayan


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from the word “queen” and get to the word “woman” following the direction from the word “king” to the word “man”.

      Given a vocabulary V , we represent each word w ∈ V by a continuous vector ew ∈ Rd of length d. We define a word embedding matrix W ∈ R|V|×d, representing each word in the vocabulary V. Earlier neural networks often used pre-trained word embeddings such as Word2Vec [Mikolov et al., 2013] or Glove [Pennington et al., 2014]. Using these approaches, the word embedding matrix W is learned in an unsupervised fashion from a large amount of raw text. Word2Vec adapts a predictive feed-forward model, aiming to maximise the prediction probability of a target word, given its surrounding context. Glove achieves this by directly reducing the dimensionality of the co-occurrence counts matrix. Importantly, embeddings learned from both approaches capture the distributional similarity among words. In a parallel trend to using pre-trained word embeddings, several other text-production models have shown that word embeddings can first be initialised randomly and then trained jointly with other network parameters; these jointly trained word embeddings are often fine tuned and better suited to the task.

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